From: Yi Liu <yi.l.liu@intel.com>
Move all the code really dependent on the legacy VFIO container/group
into a separate file: container.c. What does remain in common.c is
the code related to VFIOAddressSpace, MemoryListeners, migration and
all other general operations.
Move struct VFIOBitmap declaration to vfio-common.h also for containter.c
usage.
Signed-off-by: Eric Auger <eric.auger@redhat.com>
Signed-off-by: Yi Liu <yi.l.liu@intel.com>
Signed-off-by: Zhenzhong Duan <zhenzhong.duan@intel.com>
---
---
hw/vfio/common.c | 1085 +--------------------------------
hw/vfio/container.c | 1085 +++++++++++++++++++++++++++++++++
hw/vfio/meson.build | 1 +
include/hw/vfio/vfio-common.h | 45 ++
4 files changed, 1147 insertions(+), 1069 deletions(-)
create mode 100644 hw/vfio/container.c
diff --git a/hw/vfio/common.c b/hw/vfio/common.c
index fda5fc87b9..044710fc1f 100644
--- a/hw/vfio/common.c
+++ b/hw/vfio/common.c
@@ -45,8 +45,6 @@
#include "migration/qemu-file.h"
#include "sysemu/tpm.h"
-VFIOGroupList vfio_group_list =
- QLIST_HEAD_INITIALIZER(vfio_group_list);
static QLIST_HEAD(, VFIOAddressSpace) vfio_address_spaces =
QLIST_HEAD_INITIALIZER(vfio_address_spaces);
@@ -58,63 +56,14 @@ static QLIST_HEAD(, VFIOAddressSpace) vfio_address_spaces =
* initialized, this file descriptor is only released on QEMU exit and
* we'll re-use it should another vfio device be attached before then.
*/
-static int vfio_kvm_device_fd = -1;
+int vfio_kvm_device_fd = -1;
#endif
-static int vfio_ram_block_discard_disable(VFIOContainer *container, bool state)
-{
- switch (container->iommu_type) {
- case VFIO_TYPE1v2_IOMMU:
- case VFIO_TYPE1_IOMMU:
- /*
- * We support coordinated discarding of RAM via the RamDiscardManager.
- */
- return ram_block_uncoordinated_discard_disable(state);
- default:
- /*
- * VFIO_SPAPR_TCE_IOMMU most probably works just fine with
- * RamDiscardManager, however, it is completely untested.
- *
- * VFIO_SPAPR_TCE_v2_IOMMU with "DMA memory preregistering" does
- * completely the opposite of managing mapping/pinning dynamically as
- * required by RamDiscardManager. We would have to special-case sections
- * with a RamDiscardManager.
- */
- return ram_block_discard_disable(state);
- }
-}
-
-static VFIODevice *vfio_container_dev_iter_next(VFIOContainer *container,
- VFIODevice *curr)
-{
- VFIOGroup *group;
-
- if (!curr) {
- group = QLIST_FIRST(&container->group_list);
- } else {
- if (curr->next.le_next) {
- return curr->next.le_next;
- }
- group = curr->group->container_next.le_next;
- }
-
- if (!group) {
- return NULL;
- }
- return QLIST_FIRST(&group->device_list);
-}
-
/*
* Device state interfaces
*/
-typedef struct {
- unsigned long *bitmap;
- hwaddr size;
- hwaddr pages;
-} VFIOBitmap;
-
-static int vfio_bitmap_alloc(VFIOBitmap *vbmap, hwaddr size)
+int vfio_bitmap_alloc(VFIOBitmap *vbmap, hwaddr size)
{
vbmap->pages = REAL_HOST_PAGE_ALIGN(size) / qemu_real_host_page_size();
vbmap->size = ROUND_UP(vbmap->pages, sizeof(__u64) * BITS_PER_BYTE) /
@@ -127,9 +76,6 @@ static int vfio_bitmap_alloc(VFIOBitmap *vbmap, hwaddr size)
return 0;
}
-static int vfio_get_dirty_bitmap(VFIOContainer *container, uint64_t iova,
- uint64_t size, ram_addr_t ram_addr);
-
bool vfio_mig_active(void)
{
VFIOAddressSpace *space;
@@ -276,7 +222,7 @@ static bool vfio_devices_all_dirty_tracking(VFIOContainer *container)
return true;
}
-static bool vfio_devices_all_device_dirty_tracking(VFIOContainer *container)
+bool vfio_devices_all_device_dirty_tracking(VFIOContainer *container)
{
VFIODevice *vbasedev = NULL;
@@ -293,7 +239,7 @@ static bool vfio_devices_all_device_dirty_tracking(VFIOContainer *container)
* Check if all VFIO devices are running and migration is active, which is
* essentially equivalent to the migration being in pre-copy phase.
*/
-static bool vfio_devices_all_running_and_mig_active(VFIOContainer *container)
+bool vfio_devices_all_running_and_mig_active(VFIOContainer *container)
{
VFIODevice *vbasedev = NULL;
@@ -318,150 +264,8 @@ static bool vfio_devices_all_running_and_mig_active(VFIOContainer *container)
return true;
}
-static int vfio_dma_unmap_bitmap(VFIOContainer *container,
- hwaddr iova, ram_addr_t size,
- IOMMUTLBEntry *iotlb)
-{
- struct vfio_iommu_type1_dma_unmap *unmap;
- struct vfio_bitmap *bitmap;
- VFIOBitmap vbmap;
- int ret;
-
- ret = vfio_bitmap_alloc(&vbmap, size);
- if (ret) {
- return ret;
- }
-
- unmap = g_malloc0(sizeof(*unmap) + sizeof(*bitmap));
-
- unmap->argsz = sizeof(*unmap) + sizeof(*bitmap);
- unmap->iova = iova;
- unmap->size = size;
- unmap->flags |= VFIO_DMA_UNMAP_FLAG_GET_DIRTY_BITMAP;
- bitmap = (struct vfio_bitmap *)&unmap->data;
-
- /*
- * cpu_physical_memory_set_dirty_lebitmap() supports pages in bitmap of
- * qemu_real_host_page_size to mark those dirty. Hence set bitmap_pgsize
- * to qemu_real_host_page_size.
- */
- bitmap->pgsize = qemu_real_host_page_size();
- bitmap->size = vbmap.size;
- bitmap->data = (__u64 *)vbmap.bitmap;
-
- if (vbmap.size > container->max_dirty_bitmap_size) {
- error_report("UNMAP: Size of bitmap too big 0x%"PRIx64, vbmap.size);
- ret = -E2BIG;
- goto unmap_exit;
- }
-
- ret = ioctl(container->fd, VFIO_IOMMU_UNMAP_DMA, unmap);
- if (!ret) {
- cpu_physical_memory_set_dirty_lebitmap(vbmap.bitmap,
- iotlb->translated_addr, vbmap.pages);
- } else {
- error_report("VFIO_UNMAP_DMA with DIRTY_BITMAP : %m");
- }
-
-unmap_exit:
- g_free(unmap);
- g_free(vbmap.bitmap);
-
- return ret;
-}
-
-/*
- * DMA - Mapping and unmapping for the "type1" IOMMU interface used on x86
- */
-static int vfio_dma_unmap(VFIOContainer *container,
- hwaddr iova, ram_addr_t size,
- IOMMUTLBEntry *iotlb)
-{
- struct vfio_iommu_type1_dma_unmap unmap = {
- .argsz = sizeof(unmap),
- .flags = 0,
- .iova = iova,
- .size = size,
- };
- bool need_dirty_sync = false;
- int ret;
-
- if (iotlb && vfio_devices_all_running_and_mig_active(container)) {
- if (!vfio_devices_all_device_dirty_tracking(container) &&
- container->dirty_pages_supported) {
- return vfio_dma_unmap_bitmap(container, iova, size, iotlb);
- }
-
- need_dirty_sync = true;
- }
-
- while (ioctl(container->fd, VFIO_IOMMU_UNMAP_DMA, &unmap)) {
- /*
- * The type1 backend has an off-by-one bug in the kernel (71a7d3d78e3c
- * v4.15) where an overflow in its wrap-around check prevents us from
- * unmapping the last page of the address space. Test for the error
- * condition and re-try the unmap excluding the last page. The
- * expectation is that we've never mapped the last page anyway and this
- * unmap request comes via vIOMMU support which also makes it unlikely
- * that this page is used. This bug was introduced well after type1 v2
- * support was introduced, so we shouldn't need to test for v1. A fix
- * is queued for kernel v5.0 so this workaround can be removed once
- * affected kernels are sufficiently deprecated.
- */
- if (errno == EINVAL && unmap.size && !(unmap.iova + unmap.size) &&
- container->iommu_type == VFIO_TYPE1v2_IOMMU) {
- trace_vfio_dma_unmap_overflow_workaround();
- unmap.size -= 1ULL << ctz64(container->pgsizes);
- continue;
- }
- error_report("VFIO_UNMAP_DMA failed: %s", strerror(errno));
- return -errno;
- }
-
- if (need_dirty_sync) {
- ret = vfio_get_dirty_bitmap(container, iova, size,
- iotlb->translated_addr);
- if (ret) {
- return ret;
- }
- }
-
- return 0;
-}
-
-static int vfio_dma_map(VFIOContainer *container, hwaddr iova,
- ram_addr_t size, void *vaddr, bool readonly)
-{
- struct vfio_iommu_type1_dma_map map = {
- .argsz = sizeof(map),
- .flags = VFIO_DMA_MAP_FLAG_READ,
- .vaddr = (__u64)(uintptr_t)vaddr,
- .iova = iova,
- .size = size,
- };
-
- if (!readonly) {
- map.flags |= VFIO_DMA_MAP_FLAG_WRITE;
- }
-
- /*
- * Try the mapping, if it fails with EBUSY, unmap the region and try
- * again. This shouldn't be necessary, but we sometimes see it in
- * the VGA ROM space.
- */
- if (ioctl(container->fd, VFIO_IOMMU_MAP_DMA, &map) == 0 ||
- (errno == EBUSY && vfio_dma_unmap(container, iova, size, NULL) == 0 &&
- ioctl(container->fd, VFIO_IOMMU_MAP_DMA, &map) == 0)) {
- return 0;
- }
-
- error_report("VFIO_MAP_DMA failed: %s", strerror(errno));
- return -errno;
-}
-
-static void vfio_host_win_add(VFIOContainer *container,
- hwaddr min_iova, hwaddr max_iova,
- uint64_t iova_pgsizes)
+void vfio_host_win_add(VFIOContainer *container, hwaddr min_iova,
+ hwaddr max_iova, uint64_t iova_pgsizes)
{
VFIOHostDMAWindow *hostwin;
@@ -482,8 +286,8 @@ static void vfio_host_win_add(VFIOContainer *container,
QLIST_INSERT_HEAD(&container->hostwin_list, hostwin, hostwin_next);
}
-static int vfio_host_win_del(VFIOContainer *container, hwaddr min_iova,
- hwaddr max_iova)
+int vfio_host_win_del(VFIOContainer *container,
+ hwaddr min_iova, hwaddr max_iova)
{
VFIOHostDMAWindow *hostwin;
@@ -832,92 +636,6 @@ static bool vfio_get_section_iova_range(VFIOContainer *container,
return true;
}
-static int vfio_container_add_section_window(VFIOContainer *container,
- MemoryRegionSection *section,
- Error **errp)
-{
- VFIOHostDMAWindow *hostwin;
- hwaddr pgsize = 0;
- int ret;
-
- if (container->iommu_type != VFIO_SPAPR_TCE_v2_IOMMU) {
- return 0;
- }
-
- /* For now intersections are not allowed, we may relax this later */
- QLIST_FOREACH(hostwin, &container->hostwin_list, hostwin_next) {
- if (ranges_overlap(hostwin->min_iova,
- hostwin->max_iova - hostwin->min_iova + 1,
- section->offset_within_address_space,
- int128_get64(section->size))) {
- error_setg(errp,
- "region [0x%"PRIx64",0x%"PRIx64"] overlaps with existing"
- "host DMA window [0x%"PRIx64",0x%"PRIx64"]",
- section->offset_within_address_space,
- section->offset_within_address_space +
- int128_get64(section->size) - 1,
- hostwin->min_iova, hostwin->max_iova);
- return -EINVAL;
- }
- }
-
- ret = vfio_spapr_create_window(container, section, &pgsize);
- if (ret) {
- error_setg_errno(errp, -ret, "Failed to create SPAPR window");
- return ret;
- }
-
- vfio_host_win_add(container, section->offset_within_address_space,
- section->offset_within_address_space +
- int128_get64(section->size) - 1, pgsize);
-#ifdef CONFIG_KVM
- if (kvm_enabled()) {
- VFIOGroup *group;
- IOMMUMemoryRegion *iommu_mr = IOMMU_MEMORY_REGION(section->mr);
- struct kvm_vfio_spapr_tce param;
- struct kvm_device_attr attr = {
- .group = KVM_DEV_VFIO_GROUP,
- .attr = KVM_DEV_VFIO_GROUP_SET_SPAPR_TCE,
- .addr = (uint64_t)(unsigned long)¶m,
- };
-
- if (!memory_region_iommu_get_attr(iommu_mr, IOMMU_ATTR_SPAPR_TCE_FD,
- ¶m.tablefd)) {
- QLIST_FOREACH(group, &container->group_list, container_next) {
- param.groupfd = group->fd;
- if (ioctl(vfio_kvm_device_fd, KVM_SET_DEVICE_ATTR, &attr)) {
- error_report("vfio: failed to setup fd %d "
- "for a group with fd %d: %s",
- param.tablefd, param.groupfd,
- strerror(errno));
- return 0;
- }
- trace_vfio_spapr_group_attach(param.groupfd, param.tablefd);
- }
- }
- }
-#endif
- return 0;
-}
-
-static void vfio_container_del_section_window(VFIOContainer *container,
- MemoryRegionSection *section)
-{
- if (container->iommu_type != VFIO_SPAPR_TCE_v2_IOMMU) {
- return;
- }
-
- vfio_spapr_remove_window(container,
- section->offset_within_address_space);
- if (vfio_host_win_del(container,
- section->offset_within_address_space,
- section->offset_within_address_space +
- int128_get64(section->size) - 1) < 0) {
- hw_error("%s: Cannot delete missing window at %"HWADDR_PRIx,
- __func__, section->offset_within_address_space);
- }
-}
-
static void vfio_listener_region_add(MemoryListener *listener,
MemoryRegionSection *section)
{
@@ -1165,33 +883,6 @@ static void vfio_listener_region_del(MemoryListener *listener,
vfio_container_del_section_window(container, section);
}
-static int vfio_set_dirty_page_tracking(VFIOContainer *container, bool start)
-{
- int ret;
- struct vfio_iommu_type1_dirty_bitmap dirty = {
- .argsz = sizeof(dirty),
- };
-
- if (!container->dirty_pages_supported) {
- return 0;
- }
-
- if (start) {
- dirty.flags = VFIO_IOMMU_DIRTY_PAGES_FLAG_START;
- } else {
- dirty.flags = VFIO_IOMMU_DIRTY_PAGES_FLAG_STOP;
- }
-
- ret = ioctl(container->fd, VFIO_IOMMU_DIRTY_PAGES, &dirty);
- if (ret) {
- ret = -errno;
- error_report("Failed to set dirty tracking flag 0x%x errno: %d",
- dirty.flags, errno);
- }
-
- return ret;
-}
-
typedef struct VFIODirtyRanges {
hwaddr min32;
hwaddr max32;
@@ -1466,9 +1157,9 @@ static int vfio_device_dma_logging_report(VFIODevice *vbasedev, hwaddr iova,
return 0;
}
-static int vfio_devices_query_dirty_bitmap(VFIOContainer *container,
- VFIOBitmap *vbmap, hwaddr iova,
- hwaddr size)
+int vfio_devices_query_dirty_bitmap(VFIOContainer *container,
+ VFIOBitmap *vbmap, hwaddr iova,
+ hwaddr size)
{
VFIODevice *vbasedev = NULL;
int ret;
@@ -1489,45 +1180,8 @@ static int vfio_devices_query_dirty_bitmap(VFIOContainer *container,
return 0;
}
-static int vfio_query_dirty_bitmap(VFIOContainer *container, VFIOBitmap *vbmap,
- hwaddr iova, hwaddr size)
-{
- struct vfio_iommu_type1_dirty_bitmap *dbitmap;
- struct vfio_iommu_type1_dirty_bitmap_get *range;
- int ret;
-
- dbitmap = g_malloc0(sizeof(*dbitmap) + sizeof(*range));
-
- dbitmap->argsz = sizeof(*dbitmap) + sizeof(*range);
- dbitmap->flags = VFIO_IOMMU_DIRTY_PAGES_FLAG_GET_BITMAP;
- range = (struct vfio_iommu_type1_dirty_bitmap_get *)&dbitmap->data;
- range->iova = iova;
- range->size = size;
-
- /*
- * cpu_physical_memory_set_dirty_lebitmap() supports pages in bitmap of
- * qemu_real_host_page_size to mark those dirty. Hence set bitmap's pgsize
- * to qemu_real_host_page_size.
- */
- range->bitmap.pgsize = qemu_real_host_page_size();
- range->bitmap.size = vbmap->size;
- range->bitmap.data = (__u64 *)vbmap->bitmap;
-
- ret = ioctl(container->fd, VFIO_IOMMU_DIRTY_PAGES, dbitmap);
- if (ret) {
- ret = -errno;
- error_report("Failed to get dirty bitmap for iova: 0x%"PRIx64
- " size: 0x%"PRIx64" err: %d", (uint64_t)range->iova,
- (uint64_t)range->size, errno);
- }
-
- g_free(dbitmap);
-
- return ret;
-}
-
-static int vfio_get_dirty_bitmap(VFIOContainer *container, uint64_t iova,
- uint64_t size, ram_addr_t ram_addr)
+int vfio_get_dirty_bitmap(VFIOContainer *container, uint64_t iova,
+ uint64_t size, ram_addr_t ram_addr)
{
bool all_device_dirty_tracking =
vfio_devices_all_device_dirty_tracking(container);
@@ -1716,7 +1370,7 @@ static void vfio_listener_log_sync(MemoryListener *listener,
}
}
-static const MemoryListener vfio_memory_listener = {
+const MemoryListener vfio_memory_listener = {
.name = "vfio",
.region_add = vfio_listener_region_add,
.region_del = vfio_listener_region_del,
@@ -1725,45 +1379,6 @@ static const MemoryListener vfio_memory_listener = {
.log_sync = vfio_listener_log_sync,
};
-static void vfio_listener_release(VFIOContainer *container)
-{
- memory_listener_unregister(&container->listener);
- if (container->iommu_type == VFIO_SPAPR_TCE_v2_IOMMU) {
- memory_listener_unregister(&container->prereg_listener);
- }
-}
-
-static struct vfio_info_cap_header *
-vfio_get_iommu_type1_info_cap(struct vfio_iommu_type1_info *info, uint16_t id)
-{
- if (!(info->flags & VFIO_IOMMU_INFO_CAPS)) {
- return NULL;
- }
-
- return vfio_get_cap((void *)info, info->cap_offset, id);
-}
-
-bool vfio_get_info_dma_avail(struct vfio_iommu_type1_info *info,
- unsigned int *avail)
-{
- struct vfio_info_cap_header *hdr;
- struct vfio_iommu_type1_info_dma_avail *cap;
-
- /* If the capability cannot be found, assume no DMA limiting */
- hdr = vfio_get_iommu_type1_info_cap(info,
- VFIO_IOMMU_TYPE1_INFO_DMA_AVAIL);
- if (hdr == NULL) {
- return false;
- }
-
- if (avail != NULL) {
- cap = (void *) hdr;
- *avail = cap->avail;
- }
-
- return true;
-}
-
void vfio_reset_handler(void *opaque)
{
VFIOAddressSpace *space;
@@ -1830,11 +1445,6 @@ int vfio_kvm_device_add_fd(int fd)
return 0;
}
-static void vfio_kvm_device_add_group(VFIOGroup *group)
-{
- vfio_kvm_device_add_fd(group->fd);
-}
-
int vfio_kvm_device_del_fd(int fd)
{
#ifdef CONFIG_KVM
@@ -1857,12 +1467,7 @@ int vfio_kvm_device_del_fd(int fd)
return 0;
}
-static void vfio_kvm_device_del_group(VFIOGroup *group)
-{
- vfio_kvm_device_del_fd(group->fd);
-}
-
-static VFIOAddressSpace *vfio_get_address_space(AddressSpace *as)
+VFIOAddressSpace *vfio_get_address_space(AddressSpace *as)
{
VFIOAddressSpace *space;
@@ -1886,7 +1491,7 @@ static VFIOAddressSpace *vfio_get_address_space(AddressSpace *as)
return space;
}
-static void vfio_put_address_space(VFIOAddressSpace *space)
+void vfio_put_address_space(VFIOAddressSpace *space)
{
if (QLIST_EMPTY(&space->containers)) {
QLIST_REMOVE(space, list);
@@ -1897,499 +1502,6 @@ static void vfio_put_address_space(VFIOAddressSpace *space)
}
}
-/*
- * vfio_get_iommu_type - selects the richest iommu_type (v2 first)
- */
-static int vfio_get_iommu_type(VFIOContainer *container,
- Error **errp)
-{
- int iommu_types[] = { VFIO_TYPE1v2_IOMMU, VFIO_TYPE1_IOMMU,
- VFIO_SPAPR_TCE_v2_IOMMU, VFIO_SPAPR_TCE_IOMMU };
- int i;
-
- for (i = 0; i < ARRAY_SIZE(iommu_types); i++) {
- if (ioctl(container->fd, VFIO_CHECK_EXTENSION, iommu_types[i])) {
- return iommu_types[i];
- }
- }
- error_setg(errp, "No available IOMMU models");
- return -EINVAL;
-}
-
-static int vfio_init_container(VFIOContainer *container, int group_fd,
- Error **errp)
-{
- int iommu_type, ret;
-
- iommu_type = vfio_get_iommu_type(container, errp);
- if (iommu_type < 0) {
- return iommu_type;
- }
-
- ret = ioctl(group_fd, VFIO_GROUP_SET_CONTAINER, &container->fd);
- if (ret) {
- error_setg_errno(errp, errno, "Failed to set group container");
- return -errno;
- }
-
- while (ioctl(container->fd, VFIO_SET_IOMMU, iommu_type)) {
- if (iommu_type == VFIO_SPAPR_TCE_v2_IOMMU) {
- /*
- * On sPAPR, despite the IOMMU subdriver always advertises v1 and
- * v2, the running platform may not support v2 and there is no
- * way to guess it until an IOMMU group gets added to the container.
- * So in case it fails with v2, try v1 as a fallback.
- */
- iommu_type = VFIO_SPAPR_TCE_IOMMU;
- continue;
- }
- error_setg_errno(errp, errno, "Failed to set iommu for container");
- return -errno;
- }
-
- container->iommu_type = iommu_type;
- return 0;
-}
-
-static int vfio_get_iommu_info(VFIOContainer *container,
- struct vfio_iommu_type1_info **info)
-{
-
- size_t argsz = sizeof(struct vfio_iommu_type1_info);
-
- *info = g_new0(struct vfio_iommu_type1_info, 1);
-again:
- (*info)->argsz = argsz;
-
- if (ioctl(container->fd, VFIO_IOMMU_GET_INFO, *info)) {
- g_free(*info);
- *info = NULL;
- return -errno;
- }
-
- if (((*info)->argsz > argsz)) {
- argsz = (*info)->argsz;
- *info = g_realloc(*info, argsz);
- goto again;
- }
-
- return 0;
-}
-
-static struct vfio_info_cap_header *
-vfio_get_iommu_info_cap(struct vfio_iommu_type1_info *info, uint16_t id)
-{
- struct vfio_info_cap_header *hdr;
- void *ptr = info;
-
- if (!(info->flags & VFIO_IOMMU_INFO_CAPS)) {
- return NULL;
- }
-
- for (hdr = ptr + info->cap_offset; hdr != ptr; hdr = ptr + hdr->next) {
- if (hdr->id == id) {
- return hdr;
- }
- }
-
- return NULL;
-}
-
-static void vfio_get_iommu_info_migration(VFIOContainer *container,
- struct vfio_iommu_type1_info *info)
-{
- struct vfio_info_cap_header *hdr;
- struct vfio_iommu_type1_info_cap_migration *cap_mig;
-
- hdr = vfio_get_iommu_info_cap(info, VFIO_IOMMU_TYPE1_INFO_CAP_MIGRATION);
- if (!hdr) {
- return;
- }
-
- cap_mig = container_of(hdr, struct vfio_iommu_type1_info_cap_migration,
- header);
-
- /*
- * cpu_physical_memory_set_dirty_lebitmap() supports pages in bitmap of
- * qemu_real_host_page_size to mark those dirty.
- */
- if (cap_mig->pgsize_bitmap & qemu_real_host_page_size()) {
- container->dirty_pages_supported = true;
- container->max_dirty_bitmap_size = cap_mig->max_dirty_bitmap_size;
- container->dirty_pgsizes = cap_mig->pgsize_bitmap;
- }
-}
-
-static int vfio_connect_container(VFIOGroup *group, AddressSpace *as,
- Error **errp)
-{
- VFIOContainer *container;
- int ret, fd;
- VFIOAddressSpace *space;
-
- space = vfio_get_address_space(as);
-
- /*
- * VFIO is currently incompatible with discarding of RAM insofar as the
- * madvise to purge (zap) the page from QEMU's address space does not
- * interact with the memory API and therefore leaves stale virtual to
- * physical mappings in the IOMMU if the page was previously pinned. We
- * therefore set discarding broken for each group added to a container,
- * whether the container is used individually or shared. This provides
- * us with options to allow devices within a group to opt-in and allow
- * discarding, so long as it is done consistently for a group (for instance
- * if the device is an mdev device where it is known that the host vendor
- * driver will never pin pages outside of the working set of the guest
- * driver, which would thus not be discarding candidates).
- *
- * The first opportunity to induce pinning occurs here where we attempt to
- * attach the group to existing containers within the AddressSpace. If any
- * pages are already zapped from the virtual address space, such as from
- * previous discards, new pinning will cause valid mappings to be
- * re-established. Likewise, when the overall MemoryListener for a new
- * container is registered, a replay of mappings within the AddressSpace
- * will occur, re-establishing any previously zapped pages as well.
- *
- * Especially virtio-balloon is currently only prevented from discarding
- * new memory, it will not yet set ram_block_discard_set_required() and
- * therefore, neither stops us here or deals with the sudden memory
- * consumption of inflated memory.
- *
- * We do support discarding of memory coordinated via the RamDiscardManager
- * with some IOMMU types. vfio_ram_block_discard_disable() handles the
- * details once we know which type of IOMMU we are using.
- */
-
- QLIST_FOREACH(container, &space->containers, next) {
- if (!ioctl(group->fd, VFIO_GROUP_SET_CONTAINER, &container->fd)) {
- ret = vfio_ram_block_discard_disable(container, true);
- if (ret) {
- error_setg_errno(errp, -ret,
- "Cannot set discarding of RAM broken");
- if (ioctl(group->fd, VFIO_GROUP_UNSET_CONTAINER,
- &container->fd)) {
- error_report("vfio: error disconnecting group %d from"
- " container", group->groupid);
- }
- return ret;
- }
- group->container = container;
- QLIST_INSERT_HEAD(&container->group_list, group, container_next);
- vfio_kvm_device_add_group(group);
- return 0;
- }
- }
-
- fd = qemu_open_old("/dev/vfio/vfio", O_RDWR);
- if (fd < 0) {
- error_setg_errno(errp, errno, "failed to open /dev/vfio/vfio");
- ret = -errno;
- goto put_space_exit;
- }
-
- ret = ioctl(fd, VFIO_GET_API_VERSION);
- if (ret != VFIO_API_VERSION) {
- error_setg(errp, "supported vfio version: %d, "
- "reported version: %d", VFIO_API_VERSION, ret);
- ret = -EINVAL;
- goto close_fd_exit;
- }
-
- container = g_malloc0(sizeof(*container));
- container->space = space;
- container->fd = fd;
- container->error = NULL;
- container->dirty_pages_supported = false;
- container->dma_max_mappings = 0;
- QLIST_INIT(&container->giommu_list);
- QLIST_INIT(&container->hostwin_list);
- QLIST_INIT(&container->vrdl_list);
-
- ret = vfio_init_container(container, group->fd, errp);
- if (ret) {
- goto free_container_exit;
- }
-
- ret = vfio_ram_block_discard_disable(container, true);
- if (ret) {
- error_setg_errno(errp, -ret, "Cannot set discarding of RAM broken");
- goto free_container_exit;
- }
-
- switch (container->iommu_type) {
- case VFIO_TYPE1v2_IOMMU:
- case VFIO_TYPE1_IOMMU:
- {
- struct vfio_iommu_type1_info *info;
-
- ret = vfio_get_iommu_info(container, &info);
- if (ret) {
- error_setg_errno(errp, -ret, "Failed to get VFIO IOMMU info");
- goto enable_discards_exit;
- }
-
- if (info->flags & VFIO_IOMMU_INFO_PGSIZES) {
- container->pgsizes = info->iova_pgsizes;
- } else {
- container->pgsizes = qemu_real_host_page_size();
- }
-
- if (!vfio_get_info_dma_avail(info, &container->dma_max_mappings)) {
- container->dma_max_mappings = 65535;
- }
- vfio_get_iommu_info_migration(container, info);
- g_free(info);
-
- /*
- * FIXME: We should parse VFIO_IOMMU_TYPE1_INFO_CAP_IOVA_RANGE
- * information to get the actual window extent rather than assume
- * a 64-bit IOVA address space.
- */
- vfio_host_win_add(container, 0, (hwaddr)-1, container->pgsizes);
-
- break;
- }
- case VFIO_SPAPR_TCE_v2_IOMMU:
- case VFIO_SPAPR_TCE_IOMMU:
- {
- struct vfio_iommu_spapr_tce_info info;
- bool v2 = container->iommu_type == VFIO_SPAPR_TCE_v2_IOMMU;
-
- /*
- * The host kernel code implementing VFIO_IOMMU_DISABLE is called
- * when container fd is closed so we do not call it explicitly
- * in this file.
- */
- if (!v2) {
- ret = ioctl(fd, VFIO_IOMMU_ENABLE);
- if (ret) {
- error_setg_errno(errp, errno, "failed to enable container");
- ret = -errno;
- goto enable_discards_exit;
- }
- } else {
- container->prereg_listener = vfio_prereg_listener;
-
- memory_listener_register(&container->prereg_listener,
- &address_space_memory);
- if (container->error) {
- memory_listener_unregister(&container->prereg_listener);
- ret = -1;
- error_propagate_prepend(errp, container->error,
- "RAM memory listener initialization failed: ");
- goto enable_discards_exit;
- }
- }
-
- info.argsz = sizeof(info);
- ret = ioctl(fd, VFIO_IOMMU_SPAPR_TCE_GET_INFO, &info);
- if (ret) {
- error_setg_errno(errp, errno,
- "VFIO_IOMMU_SPAPR_TCE_GET_INFO failed");
- ret = -errno;
- if (v2) {
- memory_listener_unregister(&container->prereg_listener);
- }
- goto enable_discards_exit;
- }
-
- if (v2) {
- container->pgsizes = info.ddw.pgsizes;
- /*
- * There is a default window in just created container.
- * To make region_add/del simpler, we better remove this
- * window now and let those iommu_listener callbacks
- * create/remove them when needed.
- */
- ret = vfio_spapr_remove_window(container, info.dma32_window_start);
- if (ret) {
- error_setg_errno(errp, -ret,
- "failed to remove existing window");
- goto enable_discards_exit;
- }
- } else {
- /* The default table uses 4K pages */
- container->pgsizes = 0x1000;
- vfio_host_win_add(container, info.dma32_window_start,
- info.dma32_window_start +
- info.dma32_window_size - 1,
- 0x1000);
- }
- }
- }
-
- vfio_kvm_device_add_group(group);
-
- QLIST_INIT(&container->group_list);
- QLIST_INSERT_HEAD(&space->containers, container, next);
-
- group->container = container;
- QLIST_INSERT_HEAD(&container->group_list, group, container_next);
-
- container->listener = vfio_memory_listener;
-
- memory_listener_register(&container->listener, container->space->as);
-
- if (container->error) {
- ret = -1;
- error_propagate_prepend(errp, container->error,
- "memory listener initialization failed: ");
- goto listener_release_exit;
- }
-
- container->initialized = true;
-
- return 0;
-listener_release_exit:
- QLIST_REMOVE(group, container_next);
- QLIST_REMOVE(container, next);
- vfio_kvm_device_del_group(group);
- vfio_listener_release(container);
-
-enable_discards_exit:
- vfio_ram_block_discard_disable(container, false);
-
-free_container_exit:
- g_free(container);
-
-close_fd_exit:
- close(fd);
-
-put_space_exit:
- vfio_put_address_space(space);
-
- return ret;
-}
-
-static void vfio_disconnect_container(VFIOGroup *group)
-{
- VFIOContainer *container = group->container;
-
- QLIST_REMOVE(group, container_next);
- group->container = NULL;
-
- /*
- * Explicitly release the listener first before unset container,
- * since unset may destroy the backend container if it's the last
- * group.
- */
- if (QLIST_EMPTY(&container->group_list)) {
- vfio_listener_release(container);
- }
-
- if (ioctl(group->fd, VFIO_GROUP_UNSET_CONTAINER, &container->fd)) {
- error_report("vfio: error disconnecting group %d from container",
- group->groupid);
- }
-
- if (QLIST_EMPTY(&container->group_list)) {
- VFIOAddressSpace *space = container->space;
- VFIOGuestIOMMU *giommu, *tmp;
- VFIOHostDMAWindow *hostwin, *next;
-
- QLIST_REMOVE(container, next);
-
- QLIST_FOREACH_SAFE(giommu, &container->giommu_list, giommu_next, tmp) {
- memory_region_unregister_iommu_notifier(
- MEMORY_REGION(giommu->iommu_mr), &giommu->n);
- QLIST_REMOVE(giommu, giommu_next);
- g_free(giommu);
- }
-
- QLIST_FOREACH_SAFE(hostwin, &container->hostwin_list, hostwin_next,
- next) {
- QLIST_REMOVE(hostwin, hostwin_next);
- g_free(hostwin);
- }
-
- trace_vfio_disconnect_container(container->fd);
- close(container->fd);
- g_free(container);
-
- vfio_put_address_space(space);
- }
-}
-
-VFIOGroup *vfio_get_group(int groupid, AddressSpace *as, Error **errp)
-{
- VFIOGroup *group;
- char path[32];
- struct vfio_group_status status = { .argsz = sizeof(status) };
-
- QLIST_FOREACH(group, &vfio_group_list, next) {
- if (group->groupid == groupid) {
- /* Found it. Now is it already in the right context? */
- if (group->container->space->as == as) {
- return group;
- } else {
- error_setg(errp, "group %d used in multiple address spaces",
- group->groupid);
- return NULL;
- }
- }
- }
-
- group = g_malloc0(sizeof(*group));
-
- snprintf(path, sizeof(path), "/dev/vfio/%d", groupid);
- group->fd = qemu_open_old(path, O_RDWR);
- if (group->fd < 0) {
- error_setg_errno(errp, errno, "failed to open %s", path);
- goto free_group_exit;
- }
-
- if (ioctl(group->fd, VFIO_GROUP_GET_STATUS, &status)) {
- error_setg_errno(errp, errno, "failed to get group %d status", groupid);
- goto close_fd_exit;
- }
-
- if (!(status.flags & VFIO_GROUP_FLAGS_VIABLE)) {
- error_setg(errp, "group %d is not viable", groupid);
- error_append_hint(errp,
- "Please ensure all devices within the iommu_group "
- "are bound to their vfio bus driver.\n");
- goto close_fd_exit;
- }
-
- group->groupid = groupid;
- QLIST_INIT(&group->device_list);
-
- if (vfio_connect_container(group, as, errp)) {
- error_prepend(errp, "failed to setup container for group %d: ",
- groupid);
- goto close_fd_exit;
- }
-
- QLIST_INSERT_HEAD(&vfio_group_list, group, next);
-
- return group;
-
-close_fd_exit:
- close(group->fd);
-
-free_group_exit:
- g_free(group);
-
- return NULL;
-}
-
-void vfio_put_group(VFIOGroup *group)
-{
- if (!group || !QLIST_EMPTY(&group->device_list)) {
- return;
- }
-
- if (!group->ram_block_discard_allowed) {
- vfio_ram_block_discard_disable(group->container, false);
- }
- vfio_kvm_device_del_group(group);
- vfio_disconnect_container(group);
- QLIST_REMOVE(group, next);
- trace_vfio_put_group(group->fd);
- close(group->fd);
- g_free(group);
-}
-
struct vfio_device_info *vfio_get_device_info(int fd)
{
struct vfio_device_info *info;
@@ -2413,168 +1525,3 @@ retry:
return info;
}
-
-int vfio_get_device(VFIOGroup *group, const char *name,
- VFIODevice *vbasedev, Error **errp)
-{
- g_autofree struct vfio_device_info *info = NULL;
- int fd;
-
- fd = ioctl(group->fd, VFIO_GROUP_GET_DEVICE_FD, name);
- if (fd < 0) {
- error_setg_errno(errp, errno, "error getting device from group %d",
- group->groupid);
- error_append_hint(errp,
- "Verify all devices in group %d are bound to vfio-<bus> "
- "or pci-stub and not already in use\n", group->groupid);
- return fd;
- }
-
- info = vfio_get_device_info(fd);
- if (!info) {
- error_setg_errno(errp, errno, "error getting device info");
- close(fd);
- return -1;
- }
-
- /*
- * Set discarding of RAM as not broken for this group if the driver knows
- * the device operates compatibly with discarding. Setting must be
- * consistent per group, but since compatibility is really only possible
- * with mdev currently, we expect singleton groups.
- */
- if (vbasedev->ram_block_discard_allowed !=
- group->ram_block_discard_allowed) {
- if (!QLIST_EMPTY(&group->device_list)) {
- error_setg(errp, "Inconsistent setting of support for discarding "
- "RAM (e.g., balloon) within group");
- close(fd);
- return -1;
- }
-
- if (!group->ram_block_discard_allowed) {
- group->ram_block_discard_allowed = true;
- vfio_ram_block_discard_disable(group->container, false);
- }
- }
-
- vbasedev->fd = fd;
- vbasedev->group = group;
- QLIST_INSERT_HEAD(&group->device_list, vbasedev, next);
-
- vbasedev->num_irqs = info->num_irqs;
- vbasedev->num_regions = info->num_regions;
- vbasedev->flags = info->flags;
-
- trace_vfio_get_device(name, info->flags, info->num_regions, info->num_irqs);
-
- vbasedev->reset_works = !!(info->flags & VFIO_DEVICE_FLAGS_RESET);
-
- return 0;
-}
-
-void vfio_put_base_device(VFIODevice *vbasedev)
-{
- if (!vbasedev->group) {
- return;
- }
- QLIST_REMOVE(vbasedev, next);
- vbasedev->group = NULL;
- trace_vfio_put_base_device(vbasedev->fd);
- close(vbasedev->fd);
-}
-
-/*
- * Interfaces for IBM EEH (Enhanced Error Handling)
- */
-static bool vfio_eeh_container_ok(VFIOContainer *container)
-{
- /*
- * As of 2016-03-04 (linux-4.5) the host kernel EEH/VFIO
- * implementation is broken if there are multiple groups in a
- * container. The hardware works in units of Partitionable
- * Endpoints (== IOMMU groups) and the EEH operations naively
- * iterate across all groups in the container, without any logic
- * to make sure the groups have their state synchronized. For
- * certain operations (ENABLE) that might be ok, until an error
- * occurs, but for others (GET_STATE) it's clearly broken.
- */
-
- /*
- * XXX Once fixed kernels exist, test for them here
- */
-
- if (QLIST_EMPTY(&container->group_list)) {
- return false;
- }
-
- if (QLIST_NEXT(QLIST_FIRST(&container->group_list), container_next)) {
- return false;
- }
-
- return true;
-}
-
-static int vfio_eeh_container_op(VFIOContainer *container, uint32_t op)
-{
- struct vfio_eeh_pe_op pe_op = {
- .argsz = sizeof(pe_op),
- .op = op,
- };
- int ret;
-
- if (!vfio_eeh_container_ok(container)) {
- error_report("vfio/eeh: EEH_PE_OP 0x%x: "
- "kernel requires a container with exactly one group", op);
- return -EPERM;
- }
-
- ret = ioctl(container->fd, VFIO_EEH_PE_OP, &pe_op);
- if (ret < 0) {
- error_report("vfio/eeh: EEH_PE_OP 0x%x failed: %m", op);
- return -errno;
- }
-
- return ret;
-}
-
-static VFIOContainer *vfio_eeh_as_container(AddressSpace *as)
-{
- VFIOAddressSpace *space = vfio_get_address_space(as);
- VFIOContainer *container = NULL;
-
- if (QLIST_EMPTY(&space->containers)) {
- /* No containers to act on */
- goto out;
- }
-
- container = QLIST_FIRST(&space->containers);
-
- if (QLIST_NEXT(container, next)) {
- /* We don't yet have logic to synchronize EEH state across
- * multiple containers */
- container = NULL;
- goto out;
- }
-
-out:
- vfio_put_address_space(space);
- return container;
-}
-
-bool vfio_eeh_as_ok(AddressSpace *as)
-{
- VFIOContainer *container = vfio_eeh_as_container(as);
-
- return (container != NULL) && vfio_eeh_container_ok(container);
-}
-
-int vfio_eeh_as_op(AddressSpace *as, uint32_t op)
-{
- VFIOContainer *container = vfio_eeh_as_container(as);
-
- if (!container) {
- return -ENODEV;
- }
- return vfio_eeh_container_op(container, op);
-}
diff --git a/hw/vfio/container.c b/hw/vfio/container.c
new file mode 100644
index 0000000000..175cdbbdff
--- /dev/null
+++ b/hw/vfio/container.c
@@ -0,0 +1,1085 @@
+/*
+ * generic functions used by VFIO devices
+ *
+ * Copyright Red Hat, Inc. 2012
+ *
+ * Authors:
+ * Alex Williamson <alex.williamson@redhat.com>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2. See
+ * the COPYING file in the top-level directory.
+ *
+ * Based on qemu-kvm device-assignment:
+ * Adapted for KVM by Qumranet.
+ * Copyright (c) 2007, Neocleus, Alex Novik (alex@neocleus.com)
+ * Copyright (c) 2007, Neocleus, Guy Zana (guy@neocleus.com)
+ * Copyright (C) 2008, Qumranet, Amit Shah (amit.shah@qumranet.com)
+ * Copyright (C) 2008, Red Hat, Amit Shah (amit.shah@redhat.com)
+ * Copyright (C) 2008, IBM, Muli Ben-Yehuda (muli@il.ibm.com)
+ */
+
+#include "qemu/osdep.h"
+#include <sys/ioctl.h>
+#ifdef CONFIG_KVM
+#include <linux/kvm.h>
+#endif
+#include <linux/vfio.h>
+
+#include "hw/vfio/vfio-common.h"
+#include "hw/vfio/vfio.h"
+#include "exec/address-spaces.h"
+#include "exec/memory.h"
+#include "exec/ram_addr.h"
+#include "hw/hw.h"
+#include "qemu/error-report.h"
+#include "qemu/range.h"
+#include "sysemu/kvm.h"
+#include "sysemu/reset.h"
+#include "trace.h"
+#include "qapi/error.h"
+#include "migration/migration.h"
+
+VFIOGroupList vfio_group_list =
+ QLIST_HEAD_INITIALIZER(vfio_group_list);
+
+static int vfio_ram_block_discard_disable(VFIOContainer *container, bool state)
+{
+ switch (container->iommu_type) {
+ case VFIO_TYPE1v2_IOMMU:
+ case VFIO_TYPE1_IOMMU:
+ /*
+ * We support coordinated discarding of RAM via the RamDiscardManager.
+ */
+ return ram_block_uncoordinated_discard_disable(state);
+ default:
+ /*
+ * VFIO_SPAPR_TCE_IOMMU most probably works just fine with
+ * RamDiscardManager, however, it is completely untested.
+ *
+ * VFIO_SPAPR_TCE_v2_IOMMU with "DMA memory preregistering" does
+ * completely the opposite of managing mapping/pinning dynamically as
+ * required by RamDiscardManager. We would have to special-case sections
+ * with a RamDiscardManager.
+ */
+ return ram_block_discard_disable(state);
+ }
+}
+
+VFIODevice *vfio_container_dev_iter_next(VFIOContainer *container,
+ VFIODevice *curr)
+{
+ VFIOGroup *group;
+
+ if (!curr) {
+ group = QLIST_FIRST(&container->group_list);
+ } else {
+ if (curr->next.le_next) {
+ return curr->next.le_next;
+ }
+ group = curr->group->container_next.le_next;
+ }
+
+ if (!group) {
+ return NULL;
+ }
+ return QLIST_FIRST(&group->device_list);
+}
+
+static int vfio_dma_unmap_bitmap(VFIOContainer *container,
+ hwaddr iova, ram_addr_t size,
+ IOMMUTLBEntry *iotlb)
+{
+ struct vfio_iommu_type1_dma_unmap *unmap;
+ struct vfio_bitmap *bitmap;
+ VFIOBitmap vbmap;
+ int ret;
+
+ ret = vfio_bitmap_alloc(&vbmap, size);
+ if (ret) {
+ return ret;
+ }
+
+ unmap = g_malloc0(sizeof(*unmap) + sizeof(*bitmap));
+
+ unmap->argsz = sizeof(*unmap) + sizeof(*bitmap);
+ unmap->iova = iova;
+ unmap->size = size;
+ unmap->flags |= VFIO_DMA_UNMAP_FLAG_GET_DIRTY_BITMAP;
+ bitmap = (struct vfio_bitmap *)&unmap->data;
+
+ /*
+ * cpu_physical_memory_set_dirty_lebitmap() supports pages in bitmap of
+ * qemu_real_host_page_size to mark those dirty. Hence set bitmap_pgsize
+ * to qemu_real_host_page_size.
+ */
+ bitmap->pgsize = qemu_real_host_page_size();
+ bitmap->size = vbmap.size;
+ bitmap->data = (__u64 *)vbmap.bitmap;
+
+ if (vbmap.size > container->max_dirty_bitmap_size) {
+ error_report("UNMAP: Size of bitmap too big 0x%"PRIx64, vbmap.size);
+ ret = -E2BIG;
+ goto unmap_exit;
+ }
+
+ ret = ioctl(container->fd, VFIO_IOMMU_UNMAP_DMA, unmap);
+ if (!ret) {
+ cpu_physical_memory_set_dirty_lebitmap(vbmap.bitmap,
+ iotlb->translated_addr, vbmap.pages);
+ } else {
+ error_report("VFIO_UNMAP_DMA with DIRTY_BITMAP : %m");
+ }
+
+unmap_exit:
+ g_free(unmap);
+ g_free(vbmap.bitmap);
+
+ return ret;
+}
+
+/*
+ * DMA - Mapping and unmapping for the "type1" IOMMU interface used on x86
+ */
+int vfio_dma_unmap(VFIOContainer *container, hwaddr iova,
+ ram_addr_t size, IOMMUTLBEntry *iotlb)
+{
+ struct vfio_iommu_type1_dma_unmap unmap = {
+ .argsz = sizeof(unmap),
+ .flags = 0,
+ .iova = iova,
+ .size = size,
+ };
+ bool need_dirty_sync = false;
+ int ret;
+
+ if (iotlb && vfio_devices_all_running_and_mig_active(container)) {
+ if (!vfio_devices_all_device_dirty_tracking(container) &&
+ container->dirty_pages_supported) {
+ return vfio_dma_unmap_bitmap(container, iova, size, iotlb);
+ }
+
+ need_dirty_sync = true;
+ }
+
+ while (ioctl(container->fd, VFIO_IOMMU_UNMAP_DMA, &unmap)) {
+ /*
+ * The type1 backend has an off-by-one bug in the kernel (71a7d3d78e3c
+ * v4.15) where an overflow in its wrap-around check prevents us from
+ * unmapping the last page of the address space. Test for the error
+ * condition and re-try the unmap excluding the last page. The
+ * expectation is that we've never mapped the last page anyway and this
+ * unmap request comes via vIOMMU support which also makes it unlikely
+ * that this page is used. This bug was introduced well after type1 v2
+ * support was introduced, so we shouldn't need to test for v1. A fix
+ * is queued for kernel v5.0 so this workaround can be removed once
+ * affected kernels are sufficiently deprecated.
+ */
+ if (errno == EINVAL && unmap.size && !(unmap.iova + unmap.size) &&
+ container->iommu_type == VFIO_TYPE1v2_IOMMU) {
+ trace_vfio_dma_unmap_overflow_workaround();
+ unmap.size -= 1ULL << ctz64(container->pgsizes);
+ continue;
+ }
+ error_report("VFIO_UNMAP_DMA failed: %s", strerror(errno));
+ return -errno;
+ }
+
+ if (need_dirty_sync) {
+ ret = vfio_get_dirty_bitmap(container, iova, size,
+ iotlb->translated_addr);
+ if (ret) {
+ return ret;
+ }
+ }
+
+ return 0;
+}
+
+int vfio_dma_map(VFIOContainer *container, hwaddr iova,
+ ram_addr_t size, void *vaddr, bool readonly)
+{
+ struct vfio_iommu_type1_dma_map map = {
+ .argsz = sizeof(map),
+ .flags = VFIO_DMA_MAP_FLAG_READ,
+ .vaddr = (__u64)(uintptr_t)vaddr,
+ .iova = iova,
+ .size = size,
+ };
+
+ if (!readonly) {
+ map.flags |= VFIO_DMA_MAP_FLAG_WRITE;
+ }
+
+ /*
+ * Try the mapping, if it fails with EBUSY, unmap the region and try
+ * again. This shouldn't be necessary, but we sometimes see it in
+ * the VGA ROM space.
+ */
+ if (ioctl(container->fd, VFIO_IOMMU_MAP_DMA, &map) == 0 ||
+ (errno == EBUSY && vfio_dma_unmap(container, iova, size, NULL) == 0 &&
+ ioctl(container->fd, VFIO_IOMMU_MAP_DMA, &map) == 0)) {
+ return 0;
+ }
+
+ error_report("VFIO_MAP_DMA failed: %s", strerror(errno));
+ return -errno;
+}
+
+int vfio_set_dirty_page_tracking(VFIOContainer *container, bool start)
+{
+ int ret;
+ struct vfio_iommu_type1_dirty_bitmap dirty = {
+ .argsz = sizeof(dirty),
+ };
+
+ if (!container->dirty_pages_supported) {
+ return 0;
+ }
+
+ if (start) {
+ dirty.flags = VFIO_IOMMU_DIRTY_PAGES_FLAG_START;
+ } else {
+ dirty.flags = VFIO_IOMMU_DIRTY_PAGES_FLAG_STOP;
+ }
+
+ ret = ioctl(container->fd, VFIO_IOMMU_DIRTY_PAGES, &dirty);
+ if (ret) {
+ ret = -errno;
+ error_report("Failed to set dirty tracking flag 0x%x errno: %d",
+ dirty.flags, errno);
+ }
+
+ return ret;
+}
+
+int vfio_query_dirty_bitmap(VFIOContainer *container, VFIOBitmap *vbmap,
+ hwaddr iova, hwaddr size)
+{
+ struct vfio_iommu_type1_dirty_bitmap *dbitmap;
+ struct vfio_iommu_type1_dirty_bitmap_get *range;
+ int ret;
+
+ dbitmap = g_malloc0(sizeof(*dbitmap) + sizeof(*range));
+
+ dbitmap->argsz = sizeof(*dbitmap) + sizeof(*range);
+ dbitmap->flags = VFIO_IOMMU_DIRTY_PAGES_FLAG_GET_BITMAP;
+ range = (struct vfio_iommu_type1_dirty_bitmap_get *)&dbitmap->data;
+ range->iova = iova;
+ range->size = size;
+
+ /*
+ * cpu_physical_memory_set_dirty_lebitmap() supports pages in bitmap of
+ * qemu_real_host_page_size to mark those dirty. Hence set bitmap's pgsize
+ * to qemu_real_host_page_size.
+ */
+ range->bitmap.pgsize = qemu_real_host_page_size();
+ range->bitmap.size = vbmap->size;
+ range->bitmap.data = (__u64 *)vbmap->bitmap;
+
+ ret = ioctl(container->fd, VFIO_IOMMU_DIRTY_PAGES, dbitmap);
+ if (ret) {
+ ret = -errno;
+ error_report("Failed to get dirty bitmap for iova: 0x%"PRIx64
+ " size: 0x%"PRIx64" err: %d", (uint64_t)range->iova,
+ (uint64_t)range->size, errno);
+ }
+
+ g_free(dbitmap);
+
+ return ret;
+}
+
+static void vfio_listener_release(VFIOContainer *container)
+{
+ memory_listener_unregister(&container->listener);
+ if (container->iommu_type == VFIO_SPAPR_TCE_v2_IOMMU) {
+ memory_listener_unregister(&container->prereg_listener);
+ }
+}
+
+int vfio_container_add_section_window(VFIOContainer *container,
+ MemoryRegionSection *section,
+ Error **errp)
+{
+ VFIOHostDMAWindow *hostwin;
+ hwaddr pgsize = 0;
+ int ret;
+
+ if (container->iommu_type != VFIO_SPAPR_TCE_v2_IOMMU) {
+ return 0;
+ }
+
+ /* For now intersections are not allowed, we may relax this later */
+ QLIST_FOREACH(hostwin, &container->hostwin_list, hostwin_next) {
+ if (ranges_overlap(hostwin->min_iova,
+ hostwin->max_iova - hostwin->min_iova + 1,
+ section->offset_within_address_space,
+ int128_get64(section->size))) {
+ error_setg(errp,
+ "region [0x%"PRIx64",0x%"PRIx64"] overlaps with existing"
+ "host DMA window [0x%"PRIx64",0x%"PRIx64"]",
+ section->offset_within_address_space,
+ section->offset_within_address_space +
+ int128_get64(section->size) - 1,
+ hostwin->min_iova, hostwin->max_iova);
+ return -EINVAL;
+ }
+ }
+
+ ret = vfio_spapr_create_window(container, section, &pgsize);
+ if (ret) {
+ error_setg_errno(errp, -ret, "Failed to create SPAPR window");
+ return ret;
+ }
+
+ vfio_host_win_add(container, section->offset_within_address_space,
+ section->offset_within_address_space +
+ int128_get64(section->size) - 1, pgsize);
+#ifdef CONFIG_KVM
+ if (kvm_enabled()) {
+ VFIOGroup *group;
+ IOMMUMemoryRegion *iommu_mr = IOMMU_MEMORY_REGION(section->mr);
+ struct kvm_vfio_spapr_tce param;
+ struct kvm_device_attr attr = {
+ .group = KVM_DEV_VFIO_GROUP,
+ .attr = KVM_DEV_VFIO_GROUP_SET_SPAPR_TCE,
+ .addr = (uint64_t)(unsigned long)¶m,
+ };
+
+ if (!memory_region_iommu_get_attr(iommu_mr, IOMMU_ATTR_SPAPR_TCE_FD,
+ ¶m.tablefd)) {
+ QLIST_FOREACH(group, &container->group_list, container_next) {
+ param.groupfd = group->fd;
+ if (ioctl(vfio_kvm_device_fd, KVM_SET_DEVICE_ATTR, &attr)) {
+ error_report("vfio: failed to setup fd %d "
+ "for a group with fd %d: %s",
+ param.tablefd, param.groupfd,
+ strerror(errno));
+ return 0;
+ }
+ trace_vfio_spapr_group_attach(param.groupfd, param.tablefd);
+ }
+ }
+ }
+#endif
+ return 0;
+}
+
+void vfio_container_del_section_window(VFIOContainer *container,
+ MemoryRegionSection *section)
+{
+ if (container->iommu_type != VFIO_SPAPR_TCE_v2_IOMMU) {
+ return;
+ }
+
+ vfio_spapr_remove_window(container,
+ section->offset_within_address_space);
+ if (vfio_host_win_del(container,
+ section->offset_within_address_space,
+ section->offset_within_address_space +
+ int128_get64(section->size) - 1) < 0) {
+ hw_error("%s: Cannot delete missing window at %"HWADDR_PRIx,
+ __func__, section->offset_within_address_space);
+ }
+}
+
+static struct vfio_info_cap_header *
+vfio_get_iommu_type1_info_cap(struct vfio_iommu_type1_info *info, uint16_t id)
+{
+ if (!(info->flags & VFIO_IOMMU_INFO_CAPS)) {
+ return NULL;
+ }
+
+ return vfio_get_cap((void *)info, info->cap_offset, id);
+}
+
+bool vfio_get_info_dma_avail(struct vfio_iommu_type1_info *info,
+ unsigned int *avail)
+{
+ struct vfio_info_cap_header *hdr;
+ struct vfio_iommu_type1_info_dma_avail *cap;
+
+ /* If the capability cannot be found, assume no DMA limiting */
+ hdr = vfio_get_iommu_type1_info_cap(info,
+ VFIO_IOMMU_TYPE1_INFO_DMA_AVAIL);
+ if (hdr == NULL) {
+ return false;
+ }
+
+ if (avail != NULL) {
+ cap = (void *) hdr;
+ *avail = cap->avail;
+ }
+
+ return true;
+}
+
+static void vfio_kvm_device_add_group(VFIOGroup *group)
+{
+ vfio_kvm_device_add_fd(group->fd);
+}
+
+static void vfio_kvm_device_del_group(VFIOGroup *group)
+{
+ vfio_kvm_device_del_fd(group->fd);
+}
+
+/*
+ * vfio_get_iommu_type - selects the richest iommu_type (v2 first)
+ */
+static int vfio_get_iommu_type(VFIOContainer *container,
+ Error **errp)
+{
+ int iommu_types[] = { VFIO_TYPE1v2_IOMMU, VFIO_TYPE1_IOMMU,
+ VFIO_SPAPR_TCE_v2_IOMMU, VFIO_SPAPR_TCE_IOMMU };
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(iommu_types); i++) {
+ if (ioctl(container->fd, VFIO_CHECK_EXTENSION, iommu_types[i])) {
+ return iommu_types[i];
+ }
+ }
+ error_setg(errp, "No available IOMMU models");
+ return -EINVAL;
+}
+
+static int vfio_init_container(VFIOContainer *container, int group_fd,
+ Error **errp)
+{
+ int iommu_type, ret;
+
+ iommu_type = vfio_get_iommu_type(container, errp);
+ if (iommu_type < 0) {
+ return iommu_type;
+ }
+
+ ret = ioctl(group_fd, VFIO_GROUP_SET_CONTAINER, &container->fd);
+ if (ret) {
+ error_setg_errno(errp, errno, "Failed to set group container");
+ return -errno;
+ }
+
+ while (ioctl(container->fd, VFIO_SET_IOMMU, iommu_type)) {
+ if (iommu_type == VFIO_SPAPR_TCE_v2_IOMMU) {
+ /*
+ * On sPAPR, despite the IOMMU subdriver always advertises v1 and
+ * v2, the running platform may not support v2 and there is no
+ * way to guess it until an IOMMU group gets added to the container.
+ * So in case it fails with v2, try v1 as a fallback.
+ */
+ iommu_type = VFIO_SPAPR_TCE_IOMMU;
+ continue;
+ }
+ error_setg_errno(errp, errno, "Failed to set iommu for container");
+ return -errno;
+ }
+
+ container->iommu_type = iommu_type;
+ return 0;
+}
+
+static int vfio_get_iommu_info(VFIOContainer *container,
+ struct vfio_iommu_type1_info **info)
+{
+
+ size_t argsz = sizeof(struct vfio_iommu_type1_info);
+
+ *info = g_new0(struct vfio_iommu_type1_info, 1);
+again:
+ (*info)->argsz = argsz;
+
+ if (ioctl(container->fd, VFIO_IOMMU_GET_INFO, *info)) {
+ g_free(*info);
+ *info = NULL;
+ return -errno;
+ }
+
+ if (((*info)->argsz > argsz)) {
+ argsz = (*info)->argsz;
+ *info = g_realloc(*info, argsz);
+ goto again;
+ }
+
+ return 0;
+}
+
+static struct vfio_info_cap_header *
+vfio_get_iommu_info_cap(struct vfio_iommu_type1_info *info, uint16_t id)
+{
+ struct vfio_info_cap_header *hdr;
+ void *ptr = info;
+
+ if (!(info->flags & VFIO_IOMMU_INFO_CAPS)) {
+ return NULL;
+ }
+
+ for (hdr = ptr + info->cap_offset; hdr != ptr; hdr = ptr + hdr->next) {
+ if (hdr->id == id) {
+ return hdr;
+ }
+ }
+
+ return NULL;
+}
+
+static void vfio_get_iommu_info_migration(VFIOContainer *container,
+ struct vfio_iommu_type1_info *info)
+{
+ struct vfio_info_cap_header *hdr;
+ struct vfio_iommu_type1_info_cap_migration *cap_mig;
+
+ hdr = vfio_get_iommu_info_cap(info, VFIO_IOMMU_TYPE1_INFO_CAP_MIGRATION);
+ if (!hdr) {
+ return;
+ }
+
+ cap_mig = container_of(hdr, struct vfio_iommu_type1_info_cap_migration,
+ header);
+
+ /*
+ * cpu_physical_memory_set_dirty_lebitmap() supports pages in bitmap of
+ * qemu_real_host_page_size to mark those dirty.
+ */
+ if (cap_mig->pgsize_bitmap & qemu_real_host_page_size()) {
+ container->dirty_pages_supported = true;
+ container->max_dirty_bitmap_size = cap_mig->max_dirty_bitmap_size;
+ container->dirty_pgsizes = cap_mig->pgsize_bitmap;
+ }
+}
+
+static int vfio_connect_container(VFIOGroup *group, AddressSpace *as,
+ Error **errp)
+{
+ VFIOContainer *container;
+ int ret, fd;
+ VFIOAddressSpace *space;
+
+ space = vfio_get_address_space(as);
+
+ /*
+ * VFIO is currently incompatible with discarding of RAM insofar as the
+ * madvise to purge (zap) the page from QEMU's address space does not
+ * interact with the memory API and therefore leaves stale virtual to
+ * physical mappings in the IOMMU if the page was previously pinned. We
+ * therefore set discarding broken for each group added to a container,
+ * whether the container is used individually or shared. This provides
+ * us with options to allow devices within a group to opt-in and allow
+ * discarding, so long as it is done consistently for a group (for instance
+ * if the device is an mdev device where it is known that the host vendor
+ * driver will never pin pages outside of the working set of the guest
+ * driver, which would thus not be discarding candidates).
+ *
+ * The first opportunity to induce pinning occurs here where we attempt to
+ * attach the group to existing containers within the AddressSpace. If any
+ * pages are already zapped from the virtual address space, such as from
+ * previous discards, new pinning will cause valid mappings to be
+ * re-established. Likewise, when the overall MemoryListener for a new
+ * container is registered, a replay of mappings within the AddressSpace
+ * will occur, re-establishing any previously zapped pages as well.
+ *
+ * Especially virtio-balloon is currently only prevented from discarding
+ * new memory, it will not yet set ram_block_discard_set_required() and
+ * therefore, neither stops us here or deals with the sudden memory
+ * consumption of inflated memory.
+ *
+ * We do support discarding of memory coordinated via the RamDiscardManager
+ * with some IOMMU types. vfio_ram_block_discard_disable() handles the
+ * details once we know which type of IOMMU we are using.
+ */
+
+ QLIST_FOREACH(container, &space->containers, next) {
+ if (!ioctl(group->fd, VFIO_GROUP_SET_CONTAINER, &container->fd)) {
+ ret = vfio_ram_block_discard_disable(container, true);
+ if (ret) {
+ error_setg_errno(errp, -ret,
+ "Cannot set discarding of RAM broken");
+ if (ioctl(group->fd, VFIO_GROUP_UNSET_CONTAINER,
+ &container->fd)) {
+ error_report("vfio: error disconnecting group %d from"
+ " container", group->groupid);
+ }
+ return ret;
+ }
+ group->container = container;
+ QLIST_INSERT_HEAD(&container->group_list, group, container_next);
+ vfio_kvm_device_add_group(group);
+ return 0;
+ }
+ }
+
+ fd = qemu_open_old("/dev/vfio/vfio", O_RDWR);
+ if (fd < 0) {
+ error_setg_errno(errp, errno, "failed to open /dev/vfio/vfio");
+ ret = -errno;
+ goto put_space_exit;
+ }
+
+ ret = ioctl(fd, VFIO_GET_API_VERSION);
+ if (ret != VFIO_API_VERSION) {
+ error_setg(errp, "supported vfio version: %d, "
+ "reported version: %d", VFIO_API_VERSION, ret);
+ ret = -EINVAL;
+ goto close_fd_exit;
+ }
+
+ container = g_malloc0(sizeof(*container));
+ container->space = space;
+ container->fd = fd;
+ container->error = NULL;
+ container->dirty_pages_supported = false;
+ container->dma_max_mappings = 0;
+ QLIST_INIT(&container->giommu_list);
+ QLIST_INIT(&container->hostwin_list);
+ QLIST_INIT(&container->vrdl_list);
+
+ ret = vfio_init_container(container, group->fd, errp);
+ if (ret) {
+ goto free_container_exit;
+ }
+
+ ret = vfio_ram_block_discard_disable(container, true);
+ if (ret) {
+ error_setg_errno(errp, -ret, "Cannot set discarding of RAM broken");
+ goto free_container_exit;
+ }
+
+ switch (container->iommu_type) {
+ case VFIO_TYPE1v2_IOMMU:
+ case VFIO_TYPE1_IOMMU:
+ {
+ struct vfio_iommu_type1_info *info;
+
+ ret = vfio_get_iommu_info(container, &info);
+ if (ret) {
+ error_setg_errno(errp, -ret, "Failed to get VFIO IOMMU info");
+ goto enable_discards_exit;
+ }
+
+ if (info->flags & VFIO_IOMMU_INFO_PGSIZES) {
+ container->pgsizes = info->iova_pgsizes;
+ } else {
+ container->pgsizes = qemu_real_host_page_size();
+ }
+
+ if (!vfio_get_info_dma_avail(info, &container->dma_max_mappings)) {
+ container->dma_max_mappings = 65535;
+ }
+ vfio_get_iommu_info_migration(container, info);
+ g_free(info);
+
+ /*
+ * FIXME: We should parse VFIO_IOMMU_TYPE1_INFO_CAP_IOVA_RANGE
+ * information to get the actual window extent rather than assume
+ * a 64-bit IOVA address space.
+ */
+ vfio_host_win_add(container, 0, (hwaddr)-1, container->pgsizes);
+
+ break;
+ }
+ case VFIO_SPAPR_TCE_v2_IOMMU:
+ case VFIO_SPAPR_TCE_IOMMU:
+ {
+ struct vfio_iommu_spapr_tce_info info;
+ bool v2 = container->iommu_type == VFIO_SPAPR_TCE_v2_IOMMU;
+
+ /*
+ * The host kernel code implementing VFIO_IOMMU_DISABLE is called
+ * when container fd is closed so we do not call it explicitly
+ * in this file.
+ */
+ if (!v2) {
+ ret = ioctl(fd, VFIO_IOMMU_ENABLE);
+ if (ret) {
+ error_setg_errno(errp, errno, "failed to enable container");
+ ret = -errno;
+ goto enable_discards_exit;
+ }
+ } else {
+ container->prereg_listener = vfio_prereg_listener;
+
+ memory_listener_register(&container->prereg_listener,
+ &address_space_memory);
+ if (container->error) {
+ memory_listener_unregister(&container->prereg_listener);
+ ret = -1;
+ error_propagate_prepend(errp, container->error,
+ "RAM memory listener initialization failed: ");
+ goto enable_discards_exit;
+ }
+ }
+
+ info.argsz = sizeof(info);
+ ret = ioctl(fd, VFIO_IOMMU_SPAPR_TCE_GET_INFO, &info);
+ if (ret) {
+ error_setg_errno(errp, errno,
+ "VFIO_IOMMU_SPAPR_TCE_GET_INFO failed");
+ ret = -errno;
+ if (v2) {
+ memory_listener_unregister(&container->prereg_listener);
+ }
+ goto enable_discards_exit;
+ }
+
+ if (v2) {
+ container->pgsizes = info.ddw.pgsizes;
+ /*
+ * There is a default window in just created container.
+ * To make region_add/del simpler, we better remove this
+ * window now and let those iommu_listener callbacks
+ * create/remove them when needed.
+ */
+ ret = vfio_spapr_remove_window(container, info.dma32_window_start);
+ if (ret) {
+ error_setg_errno(errp, -ret,
+ "failed to remove existing window");
+ goto enable_discards_exit;
+ }
+ } else {
+ /* The default table uses 4K pages */
+ container->pgsizes = 0x1000;
+ vfio_host_win_add(container, info.dma32_window_start,
+ info.dma32_window_start +
+ info.dma32_window_size - 1,
+ 0x1000);
+ }
+ }
+ }
+
+ vfio_kvm_device_add_group(group);
+
+ QLIST_INIT(&container->group_list);
+ QLIST_INSERT_HEAD(&space->containers, container, next);
+
+ group->container = container;
+ QLIST_INSERT_HEAD(&container->group_list, group, container_next);
+
+ container->listener = vfio_memory_listener;
+
+ memory_listener_register(&container->listener, container->space->as);
+
+ if (container->error) {
+ ret = -1;
+ error_propagate_prepend(errp, container->error,
+ "memory listener initialization failed: ");
+ goto listener_release_exit;
+ }
+
+ container->initialized = true;
+
+ return 0;
+listener_release_exit:
+ QLIST_REMOVE(group, container_next);
+ QLIST_REMOVE(container, next);
+ vfio_kvm_device_del_group(group);
+ vfio_listener_release(container);
+
+enable_discards_exit:
+ vfio_ram_block_discard_disable(container, false);
+
+free_container_exit:
+ g_free(container);
+
+close_fd_exit:
+ close(fd);
+
+put_space_exit:
+ vfio_put_address_space(space);
+
+ return ret;
+}
+
+static void vfio_disconnect_container(VFIOGroup *group)
+{
+ VFIOContainer *container = group->container;
+
+ QLIST_REMOVE(group, container_next);
+ group->container = NULL;
+
+ /*
+ * Explicitly release the listener first before unset container,
+ * since unset may destroy the backend container if it's the last
+ * group.
+ */
+ if (QLIST_EMPTY(&container->group_list)) {
+ vfio_listener_release(container);
+ }
+
+ if (ioctl(group->fd, VFIO_GROUP_UNSET_CONTAINER, &container->fd)) {
+ error_report("vfio: error disconnecting group %d from container",
+ group->groupid);
+ }
+
+ if (QLIST_EMPTY(&container->group_list)) {
+ VFIOAddressSpace *space = container->space;
+ VFIOGuestIOMMU *giommu, *tmp;
+ VFIOHostDMAWindow *hostwin, *next;
+
+ QLIST_REMOVE(container, next);
+
+ QLIST_FOREACH_SAFE(giommu, &container->giommu_list, giommu_next, tmp) {
+ memory_region_unregister_iommu_notifier(
+ MEMORY_REGION(giommu->iommu_mr), &giommu->n);
+ QLIST_REMOVE(giommu, giommu_next);
+ g_free(giommu);
+ }
+
+ QLIST_FOREACH_SAFE(hostwin, &container->hostwin_list, hostwin_next,
+ next) {
+ QLIST_REMOVE(hostwin, hostwin_next);
+ g_free(hostwin);
+ }
+
+ trace_vfio_disconnect_container(container->fd);
+ close(container->fd);
+ g_free(container);
+
+ vfio_put_address_space(space);
+ }
+}
+
+VFIOGroup *vfio_get_group(int groupid, AddressSpace *as, Error **errp)
+{
+ VFIOGroup *group;
+ char path[32];
+ struct vfio_group_status status = { .argsz = sizeof(status) };
+
+ QLIST_FOREACH(group, &vfio_group_list, next) {
+ if (group->groupid == groupid) {
+ /* Found it. Now is it already in the right context? */
+ if (group->container->space->as == as) {
+ return group;
+ } else {
+ error_setg(errp, "group %d used in multiple address spaces",
+ group->groupid);
+ return NULL;
+ }
+ }
+ }
+
+ group = g_malloc0(sizeof(*group));
+
+ snprintf(path, sizeof(path), "/dev/vfio/%d", groupid);
+ group->fd = qemu_open_old(path, O_RDWR);
+ if (group->fd < 0) {
+ error_setg_errno(errp, errno, "failed to open %s", path);
+ goto free_group_exit;
+ }
+
+ if (ioctl(group->fd, VFIO_GROUP_GET_STATUS, &status)) {
+ error_setg_errno(errp, errno, "failed to get group %d status", groupid);
+ goto close_fd_exit;
+ }
+
+ if (!(status.flags & VFIO_GROUP_FLAGS_VIABLE)) {
+ error_setg(errp, "group %d is not viable", groupid);
+ error_append_hint(errp,
+ "Please ensure all devices within the iommu_group "
+ "are bound to their vfio bus driver.\n");
+ goto close_fd_exit;
+ }
+
+ group->groupid = groupid;
+ QLIST_INIT(&group->device_list);
+
+ if (vfio_connect_container(group, as, errp)) {
+ error_prepend(errp, "failed to setup container for group %d: ",
+ groupid);
+ goto close_fd_exit;
+ }
+
+ QLIST_INSERT_HEAD(&vfio_group_list, group, next);
+
+ return group;
+
+close_fd_exit:
+ close(group->fd);
+
+free_group_exit:
+ g_free(group);
+
+ return NULL;
+}
+
+void vfio_put_group(VFIOGroup *group)
+{
+ if (!group || !QLIST_EMPTY(&group->device_list)) {
+ return;
+ }
+
+ if (!group->ram_block_discard_allowed) {
+ vfio_ram_block_discard_disable(group->container, false);
+ }
+ vfio_kvm_device_del_group(group);
+ vfio_disconnect_container(group);
+ QLIST_REMOVE(group, next);
+ trace_vfio_put_group(group->fd);
+ close(group->fd);
+ g_free(group);
+}
+
+int vfio_get_device(VFIOGroup *group, const char *name,
+ VFIODevice *vbasedev, Error **errp)
+{
+ g_autofree struct vfio_device_info *info = NULL;
+ int fd;
+
+ fd = ioctl(group->fd, VFIO_GROUP_GET_DEVICE_FD, name);
+ if (fd < 0) {
+ error_setg_errno(errp, errno, "error getting device from group %d",
+ group->groupid);
+ error_append_hint(errp,
+ "Verify all devices in group %d are bound to vfio-<bus> "
+ "or pci-stub and not already in use\n", group->groupid);
+ return fd;
+ }
+
+ info = vfio_get_device_info(fd);
+ if (!info) {
+ error_setg_errno(errp, errno, "error getting device info");
+ close(fd);
+ return -1;
+ }
+
+ /*
+ * Set discarding of RAM as not broken for this group if the driver knows
+ * the device operates compatibly with discarding. Setting must be
+ * consistent per group, but since compatibility is really only possible
+ * with mdev currently, we expect singleton groups.
+ */
+ if (vbasedev->ram_block_discard_allowed !=
+ group->ram_block_discard_allowed) {
+ if (!QLIST_EMPTY(&group->device_list)) {
+ error_setg(errp, "Inconsistent setting of support for discarding "
+ "RAM (e.g., balloon) within group");
+ close(fd);
+ return -1;
+ }
+
+ if (!group->ram_block_discard_allowed) {
+ group->ram_block_discard_allowed = true;
+ vfio_ram_block_discard_disable(group->container, false);
+ }
+ }
+
+ vbasedev->fd = fd;
+ vbasedev->group = group;
+ QLIST_INSERT_HEAD(&group->device_list, vbasedev, next);
+
+ vbasedev->num_irqs = info->num_irqs;
+ vbasedev->num_regions = info->num_regions;
+ vbasedev->flags = info->flags;
+
+ trace_vfio_get_device(name, info->flags, info->num_regions, info->num_irqs);
+
+ vbasedev->reset_works = !!(info->flags & VFIO_DEVICE_FLAGS_RESET);
+
+ return 0;
+}
+
+void vfio_put_base_device(VFIODevice *vbasedev)
+{
+ if (!vbasedev->group) {
+ return;
+ }
+ QLIST_REMOVE(vbasedev, next);
+ vbasedev->group = NULL;
+ trace_vfio_put_base_device(vbasedev->fd);
+ close(vbasedev->fd);
+}
+
+/*
+ * Interfaces for IBM EEH (Enhanced Error Handling)
+ */
+static bool vfio_eeh_container_ok(VFIOContainer *container)
+{
+ /*
+ * As of 2016-03-04 (linux-4.5) the host kernel EEH/VFIO
+ * implementation is broken if there are multiple groups in a
+ * container. The hardware works in units of Partitionable
+ * Endpoints (== IOMMU groups) and the EEH operations naively
+ * iterate across all groups in the container, without any logic
+ * to make sure the groups have their state synchronized. For
+ * certain operations (ENABLE) that might be ok, until an error
+ * occurs, but for others (GET_STATE) it's clearly broken.
+ */
+
+ /*
+ * XXX Once fixed kernels exist, test for them here
+ */
+
+ if (QLIST_EMPTY(&container->group_list)) {
+ return false;
+ }
+
+ if (QLIST_NEXT(QLIST_FIRST(&container->group_list), container_next)) {
+ return false;
+ }
+
+ return true;
+}
+
+static int vfio_eeh_container_op(VFIOContainer *container, uint32_t op)
+{
+ struct vfio_eeh_pe_op pe_op = {
+ .argsz = sizeof(pe_op),
+ .op = op,
+ };
+ int ret;
+
+ if (!vfio_eeh_container_ok(container)) {
+ error_report("vfio/eeh: EEH_PE_OP 0x%x: "
+ "kernel requires a container with exactly one group", op);
+ return -EPERM;
+ }
+
+ ret = ioctl(container->fd, VFIO_EEH_PE_OP, &pe_op);
+ if (ret < 0) {
+ error_report("vfio/eeh: EEH_PE_OP 0x%x failed: %m", op);
+ return -errno;
+ }
+
+ return ret;
+}
+
+static VFIOContainer *vfio_eeh_as_container(AddressSpace *as)
+{
+ VFIOAddressSpace *space = vfio_get_address_space(as);
+ VFIOContainer *container = NULL;
+
+ if (QLIST_EMPTY(&space->containers)) {
+ /* No containers to act on */
+ goto out;
+ }
+
+ container = QLIST_FIRST(&space->containers);
+
+ if (QLIST_NEXT(container, next)) {
+ /*
+ * We don't yet have logic to synchronize EEH state across
+ * multiple containers
+ */
+ container = NULL;
+ goto out;
+ }
+
+out:
+ vfio_put_address_space(space);
+ return container;
+}
+
+bool vfio_eeh_as_ok(AddressSpace *as)
+{
+ VFIOContainer *container = vfio_eeh_as_container(as);
+
+ return (container != NULL) && vfio_eeh_container_ok(container);
+}
+
+int vfio_eeh_as_op(AddressSpace *as, uint32_t op)
+{
+ VFIOContainer *container = vfio_eeh_as_container(as);
+
+ if (!container) {
+ return -ENODEV;
+ }
+ return vfio_eeh_container_op(container, op);
+}
diff --git a/hw/vfio/meson.build b/hw/vfio/meson.build
index 3746c9f984..2a6912c940 100644
--- a/hw/vfio/meson.build
+++ b/hw/vfio/meson.build
@@ -2,6 +2,7 @@ vfio_ss = ss.source_set()
vfio_ss.add(files(
'helpers.c',
'common.c',
+ 'container.c',
'spapr.c',
'migration.c',
))
diff --git a/include/hw/vfio/vfio-common.h b/include/hw/vfio/vfio-common.h
index 598c3ce079..bb7f9fe9c4 100644
--- a/include/hw/vfio/vfio-common.h
+++ b/include/hw/vfio/vfio-common.h
@@ -33,6 +33,8 @@
#define VFIO_MSG_PREFIX "vfio %s: "
+extern const MemoryListener vfio_memory_listener;
+
enum {
VFIO_DEVICE_TYPE_PCI = 0,
VFIO_DEVICE_TYPE_PLATFORM = 1,
@@ -196,6 +198,38 @@ typedef struct VFIODisplay {
} dmabuf;
} VFIODisplay;
+typedef struct {
+ unsigned long *bitmap;
+ hwaddr size;
+ hwaddr pages;
+} VFIOBitmap;
+
+void vfio_host_win_add(VFIOContainer *container,
+ hwaddr min_iova, hwaddr max_iova,
+ uint64_t iova_pgsizes);
+int vfio_host_win_del(VFIOContainer *container, hwaddr min_iova,
+ hwaddr max_iova);
+VFIOAddressSpace *vfio_get_address_space(AddressSpace *as);
+void vfio_put_address_space(VFIOAddressSpace *space);
+bool vfio_devices_all_running_and_saving(VFIOContainer *container);
+
+/* container->fd */
+VFIODevice *vfio_container_dev_iter_next(VFIOContainer *container,
+ VFIODevice *curr);
+int vfio_dma_unmap(VFIOContainer *container, hwaddr iova,
+ ram_addr_t size, IOMMUTLBEntry *iotlb);
+int vfio_dma_map(VFIOContainer *container, hwaddr iova,
+ ram_addr_t size, void *vaddr, bool readonly);
+int vfio_set_dirty_page_tracking(VFIOContainer *container, bool start);
+int vfio_query_dirty_bitmap(VFIOContainer *container, VFIOBitmap *vbmap,
+ hwaddr iova, hwaddr size);
+
+int vfio_container_add_section_window(VFIOContainer *container,
+ MemoryRegionSection *section,
+ Error **errp);
+void vfio_container_del_section_window(VFIOContainer *container,
+ MemoryRegionSection *section);
+
void vfio_put_base_device(VFIODevice *vbasedev);
void vfio_disable_irqindex(VFIODevice *vbasedev, int index);
void vfio_unmask_single_irqindex(VFIODevice *vbasedev, int index);
@@ -220,6 +254,8 @@ struct vfio_device_info *vfio_get_device_info(int fd);
int vfio_get_device(VFIOGroup *group, const char *name,
VFIODevice *vbasedev, Error **errp);
+extern int vfio_kvm_device_fd;
+
int vfio_kvm_device_add_fd(int fd);
int vfio_kvm_device_del_fd(int fd);
@@ -260,4 +296,13 @@ int vfio_spapr_remove_window(VFIOContainer *container,
bool vfio_migration_realize(VFIODevice *vbasedev, Error **errp);
void vfio_migration_exit(VFIODevice *vbasedev);
+int vfio_bitmap_alloc(VFIOBitmap *vbmap, hwaddr size);
+bool vfio_devices_all_running_and_mig_active(VFIOContainer *container);
+bool vfio_devices_all_device_dirty_tracking(VFIOContainer *container);
+int vfio_devices_query_dirty_bitmap(VFIOContainer *container,
+ VFIOBitmap *vbmap, hwaddr iova,
+ hwaddr size);
+int vfio_get_dirty_bitmap(VFIOContainer *container, uint64_t iova,
+ uint64_t size, ram_addr_t ram_addr);
+
#endif /* HW_VFIO_VFIO_COMMON_H */
--
2.34.1Hi,
On 8/30/23 12:37, Zhenzhong Duan wrote:
> From: Yi Liu <yi.l.liu@intel.com>
>
> Move all the code really dependent on the legacy VFIO container/group
> into a separate file: container.c. What does remain in common.c is
> the code related to VFIOAddressSpace, MemoryListeners, migration and
> all other general operations.
>
> Move struct VFIOBitmap declaration to vfio-common.h also for containter.c
> usage.
note: this may be done in the 3d patch since vfio_bitmap_alloc could
land in helpers.c
>
> Signed-off-by: Eric Auger <eric.auger@redhat.com>
> Signed-off-by: Yi Liu <yi.l.liu@intel.com>
> Signed-off-by: Zhenzhong Duan <zhenzhong.duan@intel.com>
> ---
> ---
> hw/vfio/common.c | 1085 +--------------------------------
> hw/vfio/container.c | 1085 +++++++++++++++++++++++++++++++++
> hw/vfio/meson.build | 1 +
> include/hw/vfio/vfio-common.h | 45 ++
> 4 files changed, 1147 insertions(+), 1069 deletions(-)
> create mode 100644 hw/vfio/container.c
>
> diff --git a/hw/vfio/common.c b/hw/vfio/common.c
> index fda5fc87b9..044710fc1f 100644
> --- a/hw/vfio/common.c
> +++ b/hw/vfio/common.c
> @@ -45,8 +45,6 @@
> #include "migration/qemu-file.h"
> #include "sysemu/tpm.h"
>
> -VFIOGroupList vfio_group_list =
> - QLIST_HEAD_INITIALIZER(vfio_group_list);
> static QLIST_HEAD(, VFIOAddressSpace) vfio_address_spaces =
> QLIST_HEAD_INITIALIZER(vfio_address_spaces);
>
> @@ -58,63 +56,14 @@ static QLIST_HEAD(, VFIOAddressSpace) vfio_address_spaces =
> * initialized, this file descriptor is only released on QEMU exit and
> * we'll re-use it should another vfio device be attached before then.
> */
> -static int vfio_kvm_device_fd = -1;
> +int vfio_kvm_device_fd = -1;
> #endif
>
> -static int vfio_ram_block_discard_disable(VFIOContainer *container, bool state)
> -{
> - switch (container->iommu_type) {
> - case VFIO_TYPE1v2_IOMMU:
> - case VFIO_TYPE1_IOMMU:
> - /*
> - * We support coordinated discarding of RAM via the RamDiscardManager.
> - */
> - return ram_block_uncoordinated_discard_disable(state);
> - default:
> - /*
> - * VFIO_SPAPR_TCE_IOMMU most probably works just fine with
> - * RamDiscardManager, however, it is completely untested.
> - *
> - * VFIO_SPAPR_TCE_v2_IOMMU with "DMA memory preregistering" does
> - * completely the opposite of managing mapping/pinning dynamically as
> - * required by RamDiscardManager. We would have to special-case sections
> - * with a RamDiscardManager.
> - */
> - return ram_block_discard_disable(state);
> - }
> -}
> -
> -static VFIODevice *vfio_container_dev_iter_next(VFIOContainer *container,
> - VFIODevice *curr)
> -{
> - VFIOGroup *group;
> -
> - if (!curr) {
> - group = QLIST_FIRST(&container->group_list);
> - } else {
> - if (curr->next.le_next) {
> - return curr->next.le_next;
> - }
> - group = curr->group->container_next.le_next;
> - }
> -
> - if (!group) {
> - return NULL;
> - }
> - return QLIST_FIRST(&group->device_list);
> -}
> -
> /*
> * Device state interfaces
> */
>
> -typedef struct {
> - unsigned long *bitmap;
> - hwaddr size;
> - hwaddr pages;
> -} VFIOBitmap;
> -
> -static int vfio_bitmap_alloc(VFIOBitmap *vbmap, hwaddr size)
> +int vfio_bitmap_alloc(VFIOBitmap *vbmap, hwaddr size)
> {
> vbmap->pages = REAL_HOST_PAGE_ALIGN(size) / qemu_real_host_page_size();
> vbmap->size = ROUND_UP(vbmap->pages, sizeof(__u64) * BITS_PER_BYTE) /
> @@ -127,9 +76,6 @@ static int vfio_bitmap_alloc(VFIOBitmap *vbmap, hwaddr size)
> return 0;
> }
>
> -static int vfio_get_dirty_bitmap(VFIOContainer *container, uint64_t iova,
> - uint64_t size, ram_addr_t ram_addr);
> -
> bool vfio_mig_active(void)
> {
> VFIOAddressSpace *space;
> @@ -276,7 +222,7 @@ static bool vfio_devices_all_dirty_tracking(VFIOContainer *container)
> return true;
> }
>
> -static bool vfio_devices_all_device_dirty_tracking(VFIOContainer *container)
> +bool vfio_devices_all_device_dirty_tracking(VFIOContainer *container)
> {
> VFIODevice *vbasedev = NULL;
>
> @@ -293,7 +239,7 @@ static bool vfio_devices_all_device_dirty_tracking(VFIOContainer *container)
> * Check if all VFIO devices are running and migration is active, which is
> * essentially equivalent to the migration being in pre-copy phase.
> */
> -static bool vfio_devices_all_running_and_mig_active(VFIOContainer *container)
> +bool vfio_devices_all_running_and_mig_active(VFIOContainer *container)
> {
> VFIODevice *vbasedev = NULL;
>
> @@ -318,150 +264,8 @@ static bool vfio_devices_all_running_and_mig_active(VFIOContainer *container)
> return true;
> }
>
> -static int vfio_dma_unmap_bitmap(VFIOContainer *container,
> - hwaddr iova, ram_addr_t size,
> - IOMMUTLBEntry *iotlb)
> -{
> - struct vfio_iommu_type1_dma_unmap *unmap;
> - struct vfio_bitmap *bitmap;
> - VFIOBitmap vbmap;
> - int ret;
> -
> - ret = vfio_bitmap_alloc(&vbmap, size);
> - if (ret) {
> - return ret;
> - }
> -
> - unmap = g_malloc0(sizeof(*unmap) + sizeof(*bitmap));
> -
> - unmap->argsz = sizeof(*unmap) + sizeof(*bitmap);
> - unmap->iova = iova;
> - unmap->size = size;
> - unmap->flags |= VFIO_DMA_UNMAP_FLAG_GET_DIRTY_BITMAP;
> - bitmap = (struct vfio_bitmap *)&unmap->data;
> -
> - /*
> - * cpu_physical_memory_set_dirty_lebitmap() supports pages in bitmap of
> - * qemu_real_host_page_size to mark those dirty. Hence set bitmap_pgsize
> - * to qemu_real_host_page_size.
> - */
> - bitmap->pgsize = qemu_real_host_page_size();
> - bitmap->size = vbmap.size;
> - bitmap->data = (__u64 *)vbmap.bitmap;
> -
> - if (vbmap.size > container->max_dirty_bitmap_size) {
> - error_report("UNMAP: Size of bitmap too big 0x%"PRIx64, vbmap.size);
> - ret = -E2BIG;
> - goto unmap_exit;
> - }
> -
> - ret = ioctl(container->fd, VFIO_IOMMU_UNMAP_DMA, unmap);
> - if (!ret) {
> - cpu_physical_memory_set_dirty_lebitmap(vbmap.bitmap,
> - iotlb->translated_addr, vbmap.pages);
> - } else {
> - error_report("VFIO_UNMAP_DMA with DIRTY_BITMAP : %m");
> - }
> -
> -unmap_exit:
> - g_free(unmap);
> - g_free(vbmap.bitmap);
> -
> - return ret;
> -}
> -
> -/*
> - * DMA - Mapping and unmapping for the "type1" IOMMU interface used on x86
> - */
> -static int vfio_dma_unmap(VFIOContainer *container,
> - hwaddr iova, ram_addr_t size,
> - IOMMUTLBEntry *iotlb)
> -{
> - struct vfio_iommu_type1_dma_unmap unmap = {
> - .argsz = sizeof(unmap),
> - .flags = 0,
> - .iova = iova,
> - .size = size,
> - };
> - bool need_dirty_sync = false;
> - int ret;
> -
> - if (iotlb && vfio_devices_all_running_and_mig_active(container)) {
> - if (!vfio_devices_all_device_dirty_tracking(container) &&
> - container->dirty_pages_supported) {
> - return vfio_dma_unmap_bitmap(container, iova, size, iotlb);
> - }
> -
> - need_dirty_sync = true;
> - }
> -
> - while (ioctl(container->fd, VFIO_IOMMU_UNMAP_DMA, &unmap)) {
> - /*
> - * The type1 backend has an off-by-one bug in the kernel (71a7d3d78e3c
> - * v4.15) where an overflow in its wrap-around check prevents us from
> - * unmapping the last page of the address space. Test for the error
> - * condition and re-try the unmap excluding the last page. The
> - * expectation is that we've never mapped the last page anyway and this
> - * unmap request comes via vIOMMU support which also makes it unlikely
> - * that this page is used. This bug was introduced well after type1 v2
> - * support was introduced, so we shouldn't need to test for v1. A fix
> - * is queued for kernel v5.0 so this workaround can be removed once
> - * affected kernels are sufficiently deprecated.
> - */
> - if (errno == EINVAL && unmap.size && !(unmap.iova + unmap.size) &&
> - container->iommu_type == VFIO_TYPE1v2_IOMMU) {
> - trace_vfio_dma_unmap_overflow_workaround();
> - unmap.size -= 1ULL << ctz64(container->pgsizes);
> - continue;
> - }
> - error_report("VFIO_UNMAP_DMA failed: %s", strerror(errno));
> - return -errno;
> - }
> -
> - if (need_dirty_sync) {
> - ret = vfio_get_dirty_bitmap(container, iova, size,
> - iotlb->translated_addr);
> - if (ret) {
> - return ret;
> - }
> - }
> -
> - return 0;
> -}
> -
> -static int vfio_dma_map(VFIOContainer *container, hwaddr iova,
> - ram_addr_t size, void *vaddr, bool readonly)
> -{
> - struct vfio_iommu_type1_dma_map map = {
> - .argsz = sizeof(map),
> - .flags = VFIO_DMA_MAP_FLAG_READ,
> - .vaddr = (__u64)(uintptr_t)vaddr,
> - .iova = iova,
> - .size = size,
> - };
> -
> - if (!readonly) {
> - map.flags |= VFIO_DMA_MAP_FLAG_WRITE;
> - }
> -
> - /*
> - * Try the mapping, if it fails with EBUSY, unmap the region and try
> - * again. This shouldn't be necessary, but we sometimes see it in
> - * the VGA ROM space.
> - */
> - if (ioctl(container->fd, VFIO_IOMMU_MAP_DMA, &map) == 0 ||
> - (errno == EBUSY && vfio_dma_unmap(container, iova, size, NULL) == 0 &&
> - ioctl(container->fd, VFIO_IOMMU_MAP_DMA, &map) == 0)) {
> - return 0;
> - }
> -
> - error_report("VFIO_MAP_DMA failed: %s", strerror(errno));
> - return -errno;
> -}
> -
> -static void vfio_host_win_add(VFIOContainer *container,
> - hwaddr min_iova, hwaddr max_iova,
> - uint64_t iova_pgsizes)
> +void vfio_host_win_add(VFIOContainer *container, hwaddr min_iova,
> + hwaddr max_iova, uint64_t iova_pgsizes)
> {
> VFIOHostDMAWindow *hostwin;
>
> @@ -482,8 +286,8 @@ static void vfio_host_win_add(VFIOContainer *container,
> QLIST_INSERT_HEAD(&container->hostwin_list, hostwin, hostwin_next);
> }
>
> -static int vfio_host_win_del(VFIOContainer *container, hwaddr min_iova,
> - hwaddr max_iova)
> +int vfio_host_win_del(VFIOContainer *container,
> + hwaddr min_iova, hwaddr max_iova)
> {
> VFIOHostDMAWindow *hostwin;
>
> @@ -832,92 +636,6 @@ static bool vfio_get_section_iova_range(VFIOContainer *container,
> return true;
> }
>
> -static int vfio_container_add_section_window(VFIOContainer *container,
> - MemoryRegionSection *section,
> - Error **errp)
> -{
> - VFIOHostDMAWindow *hostwin;
> - hwaddr pgsize = 0;
> - int ret;
> -
> - if (container->iommu_type != VFIO_SPAPR_TCE_v2_IOMMU) {
> - return 0;
> - }
> -
> - /* For now intersections are not allowed, we may relax this later */
> - QLIST_FOREACH(hostwin, &container->hostwin_list, hostwin_next) {
> - if (ranges_overlap(hostwin->min_iova,
> - hostwin->max_iova - hostwin->min_iova + 1,
> - section->offset_within_address_space,
> - int128_get64(section->size))) {
> - error_setg(errp,
> - "region [0x%"PRIx64",0x%"PRIx64"] overlaps with existing"
> - "host DMA window [0x%"PRIx64",0x%"PRIx64"]",
> - section->offset_within_address_space,
> - section->offset_within_address_space +
> - int128_get64(section->size) - 1,
> - hostwin->min_iova, hostwin->max_iova);
> - return -EINVAL;
> - }
> - }
> -
> - ret = vfio_spapr_create_window(container, section, &pgsize);
> - if (ret) {
> - error_setg_errno(errp, -ret, "Failed to create SPAPR window");
> - return ret;
> - }
> -
> - vfio_host_win_add(container, section->offset_within_address_space,
> - section->offset_within_address_space +
> - int128_get64(section->size) - 1, pgsize);
> -#ifdef CONFIG_KVM
> - if (kvm_enabled()) {
> - VFIOGroup *group;
> - IOMMUMemoryRegion *iommu_mr = IOMMU_MEMORY_REGION(section->mr);
> - struct kvm_vfio_spapr_tce param;
> - struct kvm_device_attr attr = {
> - .group = KVM_DEV_VFIO_GROUP,
> - .attr = KVM_DEV_VFIO_GROUP_SET_SPAPR_TCE,
> - .addr = (uint64_t)(unsigned long)¶m,
> - };
> -
> - if (!memory_region_iommu_get_attr(iommu_mr, IOMMU_ATTR_SPAPR_TCE_FD,
> - ¶m.tablefd)) {
> - QLIST_FOREACH(group, &container->group_list, container_next) {
> - param.groupfd = group->fd;
> - if (ioctl(vfio_kvm_device_fd, KVM_SET_DEVICE_ATTR, &attr)) {
> - error_report("vfio: failed to setup fd %d "
> - "for a group with fd %d: %s",
> - param.tablefd, param.groupfd,
> - strerror(errno));
> - return 0;
> - }
> - trace_vfio_spapr_group_attach(param.groupfd, param.tablefd);
> - }
> - }
> - }
> -#endif
> - return 0;
> -}
> -
> -static void vfio_container_del_section_window(VFIOContainer *container,
> - MemoryRegionSection *section)
> -{
> - if (container->iommu_type != VFIO_SPAPR_TCE_v2_IOMMU) {
> - return;
> - }
> -
> - vfio_spapr_remove_window(container,
> - section->offset_within_address_space);
> - if (vfio_host_win_del(container,
> - section->offset_within_address_space,
> - section->offset_within_address_space +
> - int128_get64(section->size) - 1) < 0) {
> - hw_error("%s: Cannot delete missing window at %"HWADDR_PRIx,
> - __func__, section->offset_within_address_space);
> - }
> -}
> -
> static void vfio_listener_region_add(MemoryListener *listener,
> MemoryRegionSection *section)
> {
> @@ -1165,33 +883,6 @@ static void vfio_listener_region_del(MemoryListener *listener,
> vfio_container_del_section_window(container, section);
> }
>
> -static int vfio_set_dirty_page_tracking(VFIOContainer *container, bool start)
> -{
> - int ret;
> - struct vfio_iommu_type1_dirty_bitmap dirty = {
> - .argsz = sizeof(dirty),
> - };
> -
> - if (!container->dirty_pages_supported) {
> - return 0;
> - }
> -
> - if (start) {
> - dirty.flags = VFIO_IOMMU_DIRTY_PAGES_FLAG_START;
> - } else {
> - dirty.flags = VFIO_IOMMU_DIRTY_PAGES_FLAG_STOP;
> - }
> -
> - ret = ioctl(container->fd, VFIO_IOMMU_DIRTY_PAGES, &dirty);
> - if (ret) {
> - ret = -errno;
> - error_report("Failed to set dirty tracking flag 0x%x errno: %d",
> - dirty.flags, errno);
> - }
> -
> - return ret;
> -}
> -
> typedef struct VFIODirtyRanges {
> hwaddr min32;
> hwaddr max32;
> @@ -1466,9 +1157,9 @@ static int vfio_device_dma_logging_report(VFIODevice *vbasedev, hwaddr iova,
> return 0;
> }
>
> -static int vfio_devices_query_dirty_bitmap(VFIOContainer *container,
> - VFIOBitmap *vbmap, hwaddr iova,
> - hwaddr size)
> +int vfio_devices_query_dirty_bitmap(VFIOContainer *container,
> + VFIOBitmap *vbmap, hwaddr iova,
> + hwaddr size)
> {
> VFIODevice *vbasedev = NULL;
> int ret;
> @@ -1489,45 +1180,8 @@ static int vfio_devices_query_dirty_bitmap(VFIOContainer *container,
> return 0;
> }
>
> -static int vfio_query_dirty_bitmap(VFIOContainer *container, VFIOBitmap *vbmap,
> - hwaddr iova, hwaddr size)
> -{
> - struct vfio_iommu_type1_dirty_bitmap *dbitmap;
> - struct vfio_iommu_type1_dirty_bitmap_get *range;
> - int ret;
> -
> - dbitmap = g_malloc0(sizeof(*dbitmap) + sizeof(*range));
> -
> - dbitmap->argsz = sizeof(*dbitmap) + sizeof(*range);
> - dbitmap->flags = VFIO_IOMMU_DIRTY_PAGES_FLAG_GET_BITMAP;
> - range = (struct vfio_iommu_type1_dirty_bitmap_get *)&dbitmap->data;
> - range->iova = iova;
> - range->size = size;
> -
> - /*
> - * cpu_physical_memory_set_dirty_lebitmap() supports pages in bitmap of
> - * qemu_real_host_page_size to mark those dirty. Hence set bitmap's pgsize
> - * to qemu_real_host_page_size.
> - */
> - range->bitmap.pgsize = qemu_real_host_page_size();
> - range->bitmap.size = vbmap->size;
> - range->bitmap.data = (__u64 *)vbmap->bitmap;
> -
> - ret = ioctl(container->fd, VFIO_IOMMU_DIRTY_PAGES, dbitmap);
> - if (ret) {
> - ret = -errno;
> - error_report("Failed to get dirty bitmap for iova: 0x%"PRIx64
> - " size: 0x%"PRIx64" err: %d", (uint64_t)range->iova,
> - (uint64_t)range->size, errno);
> - }
> -
> - g_free(dbitmap);
> -
> - return ret;
> -}
> -
> -static int vfio_get_dirty_bitmap(VFIOContainer *container, uint64_t iova,
> - uint64_t size, ram_addr_t ram_addr)
> +int vfio_get_dirty_bitmap(VFIOContainer *container, uint64_t iova,
> + uint64_t size, ram_addr_t ram_addr)
> {
> bool all_device_dirty_tracking =
> vfio_devices_all_device_dirty_tracking(container);
> @@ -1716,7 +1370,7 @@ static void vfio_listener_log_sync(MemoryListener *listener,
> }
> }
>
> -static const MemoryListener vfio_memory_listener = {
> +const MemoryListener vfio_memory_listener = {
> .name = "vfio",
> .region_add = vfio_listener_region_add,
> .region_del = vfio_listener_region_del,
> @@ -1725,45 +1379,6 @@ static const MemoryListener vfio_memory_listener = {
> .log_sync = vfio_listener_log_sync,
> };
>
> -static void vfio_listener_release(VFIOContainer *container)
> -{
> - memory_listener_unregister(&container->listener);
> - if (container->iommu_type == VFIO_SPAPR_TCE_v2_IOMMU) {
> - memory_listener_unregister(&container->prereg_listener);
> - }
> -}
> -
> -static struct vfio_info_cap_header *
> -vfio_get_iommu_type1_info_cap(struct vfio_iommu_type1_info *info, uint16_t id)
> -{
> - if (!(info->flags & VFIO_IOMMU_INFO_CAPS)) {
> - return NULL;
> - }
> -
> - return vfio_get_cap((void *)info, info->cap_offset, id);
> -}
> -
> -bool vfio_get_info_dma_avail(struct vfio_iommu_type1_info *info,
> - unsigned int *avail)
> -{
> - struct vfio_info_cap_header *hdr;
> - struct vfio_iommu_type1_info_dma_avail *cap;
> -
> - /* If the capability cannot be found, assume no DMA limiting */
> - hdr = vfio_get_iommu_type1_info_cap(info,
> - VFIO_IOMMU_TYPE1_INFO_DMA_AVAIL);
> - if (hdr == NULL) {
> - return false;
> - }
> -
> - if (avail != NULL) {
> - cap = (void *) hdr;
> - *avail = cap->avail;
> - }
> -
> - return true;
> -}
> -
> void vfio_reset_handler(void *opaque)
> {
> VFIOAddressSpace *space;
> @@ -1830,11 +1445,6 @@ int vfio_kvm_device_add_fd(int fd)
> return 0;
> }
>
> -static void vfio_kvm_device_add_group(VFIOGroup *group)
> -{
> - vfio_kvm_device_add_fd(group->fd);
> -}
> -
> int vfio_kvm_device_del_fd(int fd)
> {
> #ifdef CONFIG_KVM
> @@ -1857,12 +1467,7 @@ int vfio_kvm_device_del_fd(int fd)
> return 0;
> }
>
> -static void vfio_kvm_device_del_group(VFIOGroup *group)
> -{
> - vfio_kvm_device_del_fd(group->fd);
> -}
> -
> -static VFIOAddressSpace *vfio_get_address_space(AddressSpace *as)
> +VFIOAddressSpace *vfio_get_address_space(AddressSpace *as)
> {
> VFIOAddressSpace *space;
>
> @@ -1886,7 +1491,7 @@ static VFIOAddressSpace *vfio_get_address_space(AddressSpace *as)
> return space;
> }
>
> -static void vfio_put_address_space(VFIOAddressSpace *space)
> +void vfio_put_address_space(VFIOAddressSpace *space)
> {
> if (QLIST_EMPTY(&space->containers)) {
> QLIST_REMOVE(space, list);
> @@ -1897,499 +1502,6 @@ static void vfio_put_address_space(VFIOAddressSpace *space)
> }
> }
>
> -/*
> - * vfio_get_iommu_type - selects the richest iommu_type (v2 first)
> - */
> -static int vfio_get_iommu_type(VFIOContainer *container,
> - Error **errp)
> -{
> - int iommu_types[] = { VFIO_TYPE1v2_IOMMU, VFIO_TYPE1_IOMMU,
> - VFIO_SPAPR_TCE_v2_IOMMU, VFIO_SPAPR_TCE_IOMMU };
> - int i;
> -
> - for (i = 0; i < ARRAY_SIZE(iommu_types); i++) {
> - if (ioctl(container->fd, VFIO_CHECK_EXTENSION, iommu_types[i])) {
> - return iommu_types[i];
> - }
> - }
> - error_setg(errp, "No available IOMMU models");
> - return -EINVAL;
> -}
> -
> -static int vfio_init_container(VFIOContainer *container, int group_fd,
> - Error **errp)
> -{
> - int iommu_type, ret;
> -
> - iommu_type = vfio_get_iommu_type(container, errp);
> - if (iommu_type < 0) {
> - return iommu_type;
> - }
> -
> - ret = ioctl(group_fd, VFIO_GROUP_SET_CONTAINER, &container->fd);
> - if (ret) {
> - error_setg_errno(errp, errno, "Failed to set group container");
> - return -errno;
> - }
> -
> - while (ioctl(container->fd, VFIO_SET_IOMMU, iommu_type)) {
> - if (iommu_type == VFIO_SPAPR_TCE_v2_IOMMU) {
> - /*
> - * On sPAPR, despite the IOMMU subdriver always advertises v1 and
> - * v2, the running platform may not support v2 and there is no
> - * way to guess it until an IOMMU group gets added to the container.
> - * So in case it fails with v2, try v1 as a fallback.
> - */
> - iommu_type = VFIO_SPAPR_TCE_IOMMU;
> - continue;
> - }
> - error_setg_errno(errp, errno, "Failed to set iommu for container");
> - return -errno;
> - }
> -
> - container->iommu_type = iommu_type;
> - return 0;
> -}
> -
> -static int vfio_get_iommu_info(VFIOContainer *container,
> - struct vfio_iommu_type1_info **info)
> -{
> -
> - size_t argsz = sizeof(struct vfio_iommu_type1_info);
> -
> - *info = g_new0(struct vfio_iommu_type1_info, 1);
> -again:
> - (*info)->argsz = argsz;
> -
> - if (ioctl(container->fd, VFIO_IOMMU_GET_INFO, *info)) {
> - g_free(*info);
> - *info = NULL;
> - return -errno;
> - }
> -
> - if (((*info)->argsz > argsz)) {
> - argsz = (*info)->argsz;
> - *info = g_realloc(*info, argsz);
> - goto again;
> - }
> -
> - return 0;
> -}
> -
> -static struct vfio_info_cap_header *
> -vfio_get_iommu_info_cap(struct vfio_iommu_type1_info *info, uint16_t id)
> -{
> - struct vfio_info_cap_header *hdr;
> - void *ptr = info;
> -
> - if (!(info->flags & VFIO_IOMMU_INFO_CAPS)) {
> - return NULL;
> - }
> -
> - for (hdr = ptr + info->cap_offset; hdr != ptr; hdr = ptr + hdr->next) {
> - if (hdr->id == id) {
> - return hdr;
> - }
> - }
> -
> - return NULL;
> -}
> -
> -static void vfio_get_iommu_info_migration(VFIOContainer *container,
> - struct vfio_iommu_type1_info *info)
> -{
> - struct vfio_info_cap_header *hdr;
> - struct vfio_iommu_type1_info_cap_migration *cap_mig;
> -
> - hdr = vfio_get_iommu_info_cap(info, VFIO_IOMMU_TYPE1_INFO_CAP_MIGRATION);
> - if (!hdr) {
> - return;
> - }
> -
> - cap_mig = container_of(hdr, struct vfio_iommu_type1_info_cap_migration,
> - header);
> -
> - /*
> - * cpu_physical_memory_set_dirty_lebitmap() supports pages in bitmap of
> - * qemu_real_host_page_size to mark those dirty.
> - */
> - if (cap_mig->pgsize_bitmap & qemu_real_host_page_size()) {
> - container->dirty_pages_supported = true;
> - container->max_dirty_bitmap_size = cap_mig->max_dirty_bitmap_size;
> - container->dirty_pgsizes = cap_mig->pgsize_bitmap;
> - }
> -}
> -
> -static int vfio_connect_container(VFIOGroup *group, AddressSpace *as,
> - Error **errp)
> -{
> - VFIOContainer *container;
> - int ret, fd;
> - VFIOAddressSpace *space;
> -
> - space = vfio_get_address_space(as);
> -
> - /*
> - * VFIO is currently incompatible with discarding of RAM insofar as the
> - * madvise to purge (zap) the page from QEMU's address space does not
> - * interact with the memory API and therefore leaves stale virtual to
> - * physical mappings in the IOMMU if the page was previously pinned. We
> - * therefore set discarding broken for each group added to a container,
> - * whether the container is used individually or shared. This provides
> - * us with options to allow devices within a group to opt-in and allow
> - * discarding, so long as it is done consistently for a group (for instance
> - * if the device is an mdev device where it is known that the host vendor
> - * driver will never pin pages outside of the working set of the guest
> - * driver, which would thus not be discarding candidates).
> - *
> - * The first opportunity to induce pinning occurs here where we attempt to
> - * attach the group to existing containers within the AddressSpace. If any
> - * pages are already zapped from the virtual address space, such as from
> - * previous discards, new pinning will cause valid mappings to be
> - * re-established. Likewise, when the overall MemoryListener for a new
> - * container is registered, a replay of mappings within the AddressSpace
> - * will occur, re-establishing any previously zapped pages as well.
> - *
> - * Especially virtio-balloon is currently only prevented from discarding
> - * new memory, it will not yet set ram_block_discard_set_required() and
> - * therefore, neither stops us here or deals with the sudden memory
> - * consumption of inflated memory.
> - *
> - * We do support discarding of memory coordinated via the RamDiscardManager
> - * with some IOMMU types. vfio_ram_block_discard_disable() handles the
> - * details once we know which type of IOMMU we are using.
> - */
> -
> - QLIST_FOREACH(container, &space->containers, next) {
> - if (!ioctl(group->fd, VFIO_GROUP_SET_CONTAINER, &container->fd)) {
> - ret = vfio_ram_block_discard_disable(container, true);
> - if (ret) {
> - error_setg_errno(errp, -ret,
> - "Cannot set discarding of RAM broken");
> - if (ioctl(group->fd, VFIO_GROUP_UNSET_CONTAINER,
> - &container->fd)) {
> - error_report("vfio: error disconnecting group %d from"
> - " container", group->groupid);
> - }
> - return ret;
> - }
> - group->container = container;
> - QLIST_INSERT_HEAD(&container->group_list, group, container_next);
> - vfio_kvm_device_add_group(group);
> - return 0;
> - }
> - }
> -
> - fd = qemu_open_old("/dev/vfio/vfio", O_RDWR);
> - if (fd < 0) {
> - error_setg_errno(errp, errno, "failed to open /dev/vfio/vfio");
> - ret = -errno;
> - goto put_space_exit;
> - }
> -
> - ret = ioctl(fd, VFIO_GET_API_VERSION);
> - if (ret != VFIO_API_VERSION) {
> - error_setg(errp, "supported vfio version: %d, "
> - "reported version: %d", VFIO_API_VERSION, ret);
> - ret = -EINVAL;
> - goto close_fd_exit;
> - }
> -
> - container = g_malloc0(sizeof(*container));
> - container->space = space;
> - container->fd = fd;
> - container->error = NULL;
> - container->dirty_pages_supported = false;
> - container->dma_max_mappings = 0;
> - QLIST_INIT(&container->giommu_list);
> - QLIST_INIT(&container->hostwin_list);
> - QLIST_INIT(&container->vrdl_list);
> -
> - ret = vfio_init_container(container, group->fd, errp);
> - if (ret) {
> - goto free_container_exit;
> - }
> -
> - ret = vfio_ram_block_discard_disable(container, true);
> - if (ret) {
> - error_setg_errno(errp, -ret, "Cannot set discarding of RAM broken");
> - goto free_container_exit;
> - }
> -
> - switch (container->iommu_type) {
> - case VFIO_TYPE1v2_IOMMU:
> - case VFIO_TYPE1_IOMMU:
> - {
> - struct vfio_iommu_type1_info *info;
> -
> - ret = vfio_get_iommu_info(container, &info);
> - if (ret) {
> - error_setg_errno(errp, -ret, "Failed to get VFIO IOMMU info");
> - goto enable_discards_exit;
> - }
> -
> - if (info->flags & VFIO_IOMMU_INFO_PGSIZES) {
> - container->pgsizes = info->iova_pgsizes;
> - } else {
> - container->pgsizes = qemu_real_host_page_size();
> - }
> -
> - if (!vfio_get_info_dma_avail(info, &container->dma_max_mappings)) {
> - container->dma_max_mappings = 65535;
> - }
> - vfio_get_iommu_info_migration(container, info);
> - g_free(info);
> -
> - /*
> - * FIXME: We should parse VFIO_IOMMU_TYPE1_INFO_CAP_IOVA_RANGE
> - * information to get the actual window extent rather than assume
> - * a 64-bit IOVA address space.
> - */
> - vfio_host_win_add(container, 0, (hwaddr)-1, container->pgsizes);
> -
> - break;
> - }
> - case VFIO_SPAPR_TCE_v2_IOMMU:
> - case VFIO_SPAPR_TCE_IOMMU:
> - {
> - struct vfio_iommu_spapr_tce_info info;
> - bool v2 = container->iommu_type == VFIO_SPAPR_TCE_v2_IOMMU;
> -
> - /*
> - * The host kernel code implementing VFIO_IOMMU_DISABLE is called
> - * when container fd is closed so we do not call it explicitly
> - * in this file.
> - */
> - if (!v2) {
> - ret = ioctl(fd, VFIO_IOMMU_ENABLE);
> - if (ret) {
> - error_setg_errno(errp, errno, "failed to enable container");
> - ret = -errno;
> - goto enable_discards_exit;
> - }
> - } else {
> - container->prereg_listener = vfio_prereg_listener;
> -
> - memory_listener_register(&container->prereg_listener,
> - &address_space_memory);
> - if (container->error) {
> - memory_listener_unregister(&container->prereg_listener);
> - ret = -1;
> - error_propagate_prepend(errp, container->error,
> - "RAM memory listener initialization failed: ");
> - goto enable_discards_exit;
> - }
> - }
> -
> - info.argsz = sizeof(info);
> - ret = ioctl(fd, VFIO_IOMMU_SPAPR_TCE_GET_INFO, &info);
> - if (ret) {
> - error_setg_errno(errp, errno,
> - "VFIO_IOMMU_SPAPR_TCE_GET_INFO failed");
> - ret = -errno;
> - if (v2) {
> - memory_listener_unregister(&container->prereg_listener);
> - }
> - goto enable_discards_exit;
> - }
> -
> - if (v2) {
> - container->pgsizes = info.ddw.pgsizes;
> - /*
> - * There is a default window in just created container.
> - * To make region_add/del simpler, we better remove this
> - * window now and let those iommu_listener callbacks
> - * create/remove them when needed.
> - */
> - ret = vfio_spapr_remove_window(container, info.dma32_window_start);
> - if (ret) {
> - error_setg_errno(errp, -ret,
> - "failed to remove existing window");
> - goto enable_discards_exit;
> - }
> - } else {
> - /* The default table uses 4K pages */
> - container->pgsizes = 0x1000;
> - vfio_host_win_add(container, info.dma32_window_start,
> - info.dma32_window_start +
> - info.dma32_window_size - 1,
> - 0x1000);
> - }
> - }
> - }
> -
> - vfio_kvm_device_add_group(group);
> -
> - QLIST_INIT(&container->group_list);
> - QLIST_INSERT_HEAD(&space->containers, container, next);
> -
> - group->container = container;
> - QLIST_INSERT_HEAD(&container->group_list, group, container_next);
> -
> - container->listener = vfio_memory_listener;
> -
> - memory_listener_register(&container->listener, container->space->as);
> -
> - if (container->error) {
> - ret = -1;
> - error_propagate_prepend(errp, container->error,
> - "memory listener initialization failed: ");
> - goto listener_release_exit;
> - }
> -
> - container->initialized = true;
> -
> - return 0;
> -listener_release_exit:
> - QLIST_REMOVE(group, container_next);
> - QLIST_REMOVE(container, next);
> - vfio_kvm_device_del_group(group);
> - vfio_listener_release(container);
> -
> -enable_discards_exit:
> - vfio_ram_block_discard_disable(container, false);
> -
> -free_container_exit:
> - g_free(container);
> -
> -close_fd_exit:
> - close(fd);
> -
> -put_space_exit:
> - vfio_put_address_space(space);
> -
> - return ret;
> -}
> -
> -static void vfio_disconnect_container(VFIOGroup *group)
> -{
> - VFIOContainer *container = group->container;
> -
> - QLIST_REMOVE(group, container_next);
> - group->container = NULL;
> -
> - /*
> - * Explicitly release the listener first before unset container,
> - * since unset may destroy the backend container if it's the last
> - * group.
> - */
> - if (QLIST_EMPTY(&container->group_list)) {
> - vfio_listener_release(container);
> - }
> -
> - if (ioctl(group->fd, VFIO_GROUP_UNSET_CONTAINER, &container->fd)) {
> - error_report("vfio: error disconnecting group %d from container",
> - group->groupid);
> - }
> -
> - if (QLIST_EMPTY(&container->group_list)) {
> - VFIOAddressSpace *space = container->space;
> - VFIOGuestIOMMU *giommu, *tmp;
> - VFIOHostDMAWindow *hostwin, *next;
> -
> - QLIST_REMOVE(container, next);
> -
> - QLIST_FOREACH_SAFE(giommu, &container->giommu_list, giommu_next, tmp) {
> - memory_region_unregister_iommu_notifier(
> - MEMORY_REGION(giommu->iommu_mr), &giommu->n);
> - QLIST_REMOVE(giommu, giommu_next);
> - g_free(giommu);
> - }
> -
> - QLIST_FOREACH_SAFE(hostwin, &container->hostwin_list, hostwin_next,
> - next) {
> - QLIST_REMOVE(hostwin, hostwin_next);
> - g_free(hostwin);
> - }
> -
> - trace_vfio_disconnect_container(container->fd);
> - close(container->fd);
> - g_free(container);
> -
> - vfio_put_address_space(space);
> - }
> -}
> -
> -VFIOGroup *vfio_get_group(int groupid, AddressSpace *as, Error **errp)
> -{
> - VFIOGroup *group;
> - char path[32];
> - struct vfio_group_status status = { .argsz = sizeof(status) };
> -
> - QLIST_FOREACH(group, &vfio_group_list, next) {
> - if (group->groupid == groupid) {
> - /* Found it. Now is it already in the right context? */
> - if (group->container->space->as == as) {
> - return group;
> - } else {
> - error_setg(errp, "group %d used in multiple address spaces",
> - group->groupid);
> - return NULL;
> - }
> - }
> - }
> -
> - group = g_malloc0(sizeof(*group));
> -
> - snprintf(path, sizeof(path), "/dev/vfio/%d", groupid);
> - group->fd = qemu_open_old(path, O_RDWR);
> - if (group->fd < 0) {
> - error_setg_errno(errp, errno, "failed to open %s", path);
> - goto free_group_exit;
> - }
> -
> - if (ioctl(group->fd, VFIO_GROUP_GET_STATUS, &status)) {
> - error_setg_errno(errp, errno, "failed to get group %d status", groupid);
> - goto close_fd_exit;
> - }
> -
> - if (!(status.flags & VFIO_GROUP_FLAGS_VIABLE)) {
> - error_setg(errp, "group %d is not viable", groupid);
> - error_append_hint(errp,
> - "Please ensure all devices within the iommu_group "
> - "are bound to their vfio bus driver.\n");
> - goto close_fd_exit;
> - }
> -
> - group->groupid = groupid;
> - QLIST_INIT(&group->device_list);
> -
> - if (vfio_connect_container(group, as, errp)) {
> - error_prepend(errp, "failed to setup container for group %d: ",
> - groupid);
> - goto close_fd_exit;
> - }
> -
> - QLIST_INSERT_HEAD(&vfio_group_list, group, next);
> -
> - return group;
> -
> -close_fd_exit:
> - close(group->fd);
> -
> -free_group_exit:
> - g_free(group);
> -
> - return NULL;
> -}
> -
> -void vfio_put_group(VFIOGroup *group)
> -{
> - if (!group || !QLIST_EMPTY(&group->device_list)) {
> - return;
> - }
> -
> - if (!group->ram_block_discard_allowed) {
> - vfio_ram_block_discard_disable(group->container, false);
> - }
> - vfio_kvm_device_del_group(group);
> - vfio_disconnect_container(group);
> - QLIST_REMOVE(group, next);
> - trace_vfio_put_group(group->fd);
> - close(group->fd);
> - g_free(group);
> -}
> -
> struct vfio_device_info *vfio_get_device_info(int fd)
> {
> struct vfio_device_info *info;
> @@ -2413,168 +1525,3 @@ retry:
>
> return info;
> }
> -
> -int vfio_get_device(VFIOGroup *group, const char *name,
> - VFIODevice *vbasedev, Error **errp)
> -{
> - g_autofree struct vfio_device_info *info = NULL;
> - int fd;
> -
> - fd = ioctl(group->fd, VFIO_GROUP_GET_DEVICE_FD, name);
> - if (fd < 0) {
> - error_setg_errno(errp, errno, "error getting device from group %d",
> - group->groupid);
> - error_append_hint(errp,
> - "Verify all devices in group %d are bound to vfio-<bus> "
> - "or pci-stub and not already in use\n", group->groupid);
> - return fd;
> - }
> -
> - info = vfio_get_device_info(fd);
> - if (!info) {
> - error_setg_errno(errp, errno, "error getting device info");
> - close(fd);
> - return -1;
> - }
> -
> - /*
> - * Set discarding of RAM as not broken for this group if the driver knows
> - * the device operates compatibly with discarding. Setting must be
> - * consistent per group, but since compatibility is really only possible
> - * with mdev currently, we expect singleton groups.
> - */
> - if (vbasedev->ram_block_discard_allowed !=
> - group->ram_block_discard_allowed) {
> - if (!QLIST_EMPTY(&group->device_list)) {
> - error_setg(errp, "Inconsistent setting of support for discarding "
> - "RAM (e.g., balloon) within group");
> - close(fd);
> - return -1;
> - }
> -
> - if (!group->ram_block_discard_allowed) {
> - group->ram_block_discard_allowed = true;
> - vfio_ram_block_discard_disable(group->container, false);
> - }
> - }
> -
> - vbasedev->fd = fd;
> - vbasedev->group = group;
> - QLIST_INSERT_HEAD(&group->device_list, vbasedev, next);
> -
> - vbasedev->num_irqs = info->num_irqs;
> - vbasedev->num_regions = info->num_regions;
> - vbasedev->flags = info->flags;
> -
> - trace_vfio_get_device(name, info->flags, info->num_regions, info->num_irqs);
> -
> - vbasedev->reset_works = !!(info->flags & VFIO_DEVICE_FLAGS_RESET);
> -
> - return 0;
> -}
> -
> -void vfio_put_base_device(VFIODevice *vbasedev)
> -{
> - if (!vbasedev->group) {
> - return;
> - }
> - QLIST_REMOVE(vbasedev, next);
> - vbasedev->group = NULL;
> - trace_vfio_put_base_device(vbasedev->fd);
> - close(vbasedev->fd);
> -}
> -
> -/*
> - * Interfaces for IBM EEH (Enhanced Error Handling)
> - */
> -static bool vfio_eeh_container_ok(VFIOContainer *container)
> -{
> - /*
> - * As of 2016-03-04 (linux-4.5) the host kernel EEH/VFIO
> - * implementation is broken if there are multiple groups in a
> - * container. The hardware works in units of Partitionable
> - * Endpoints (== IOMMU groups) and the EEH operations naively
> - * iterate across all groups in the container, without any logic
> - * to make sure the groups have their state synchronized. For
> - * certain operations (ENABLE) that might be ok, until an error
> - * occurs, but for others (GET_STATE) it's clearly broken.
> - */
> -
> - /*
> - * XXX Once fixed kernels exist, test for them here
> - */
> -
> - if (QLIST_EMPTY(&container->group_list)) {
> - return false;
> - }
> -
> - if (QLIST_NEXT(QLIST_FIRST(&container->group_list), container_next)) {
> - return false;
> - }
> -
> - return true;
> -}
> -
> -static int vfio_eeh_container_op(VFIOContainer *container, uint32_t op)
> -{
> - struct vfio_eeh_pe_op pe_op = {
> - .argsz = sizeof(pe_op),
> - .op = op,
> - };
> - int ret;
> -
> - if (!vfio_eeh_container_ok(container)) {
> - error_report("vfio/eeh: EEH_PE_OP 0x%x: "
> - "kernel requires a container with exactly one group", op);
> - return -EPERM;
> - }
> -
> - ret = ioctl(container->fd, VFIO_EEH_PE_OP, &pe_op);
> - if (ret < 0) {
> - error_report("vfio/eeh: EEH_PE_OP 0x%x failed: %m", op);
> - return -errno;
> - }
> -
> - return ret;
> -}
> -
> -static VFIOContainer *vfio_eeh_as_container(AddressSpace *as)
> -{
> - VFIOAddressSpace *space = vfio_get_address_space(as);
> - VFIOContainer *container = NULL;
> -
> - if (QLIST_EMPTY(&space->containers)) {
> - /* No containers to act on */
> - goto out;
> - }
> -
> - container = QLIST_FIRST(&space->containers);
> -
> - if (QLIST_NEXT(container, next)) {
> - /* We don't yet have logic to synchronize EEH state across
> - * multiple containers */
> - container = NULL;
> - goto out;
> - }
> -
> -out:
> - vfio_put_address_space(space);
> - return container;
> -}
> -
> -bool vfio_eeh_as_ok(AddressSpace *as)
> -{
> - VFIOContainer *container = vfio_eeh_as_container(as);
> -
> - return (container != NULL) && vfio_eeh_container_ok(container);
> -}
> -
> -int vfio_eeh_as_op(AddressSpace *as, uint32_t op)
> -{
> - VFIOContainer *container = vfio_eeh_as_container(as);
> -
> - if (!container) {
> - return -ENODEV;
> - }
> - return vfio_eeh_container_op(container, op);
> -}
> diff --git a/hw/vfio/container.c b/hw/vfio/container.c
> new file mode 100644
> index 0000000000..175cdbbdff
> --- /dev/null
> +++ b/hw/vfio/container.c
> @@ -0,0 +1,1085 @@
> +/*
> + * generic functions used by VFIO devices
> + *
> + * Copyright Red Hat, Inc. 2012
> + *
> + * Authors:
> + * Alex Williamson <alex.williamson@redhat.com>
> + *
> + * This work is licensed under the terms of the GNU GPL, version 2. See
> + * the COPYING file in the top-level directory.
> + *
> + * Based on qemu-kvm device-assignment:
> + * Adapted for KVM by Qumranet.
> + * Copyright (c) 2007, Neocleus, Alex Novik (alex@neocleus.com)
> + * Copyright (c) 2007, Neocleus, Guy Zana (guy@neocleus.com)
> + * Copyright (C) 2008, Qumranet, Amit Shah (amit.shah@qumranet.com)
> + * Copyright (C) 2008, Red Hat, Amit Shah (amit.shah@redhat.com)
> + * Copyright (C) 2008, IBM, Muli Ben-Yehuda (muli@il.ibm.com)
> + */
> +
> +#include "qemu/osdep.h"
> +#include <sys/ioctl.h>
> +#ifdef CONFIG_KVM
> +#include <linux/kvm.h>
> +#endif
> +#include <linux/vfio.h>
> +
> +#include "hw/vfio/vfio-common.h"
> +#include "hw/vfio/vfio.h"
> +#include "exec/address-spaces.h"
> +#include "exec/memory.h"
> +#include "exec/ram_addr.h"
> +#include "hw/hw.h"
> +#include "qemu/error-report.h"
> +#include "qemu/range.h"
> +#include "sysemu/kvm.h"
> +#include "sysemu/reset.h"
> +#include "trace.h"
> +#include "qapi/error.h"
> +#include "migration/migration.h"
> +
> +VFIOGroupList vfio_group_list =
> + QLIST_HEAD_INITIALIZER(vfio_group_list);
> +
> +static int vfio_ram_block_discard_disable(VFIOContainer *container, bool state)
> +{
> + switch (container->iommu_type) {
> + case VFIO_TYPE1v2_IOMMU:
> + case VFIO_TYPE1_IOMMU:
> + /*
> + * We support coordinated discarding of RAM via the RamDiscardManager.
> + */
> + return ram_block_uncoordinated_discard_disable(state);
> + default:
> + /*
> + * VFIO_SPAPR_TCE_IOMMU most probably works just fine with
> + * RamDiscardManager, however, it is completely untested.
> + *
> + * VFIO_SPAPR_TCE_v2_IOMMU with "DMA memory preregistering" does
> + * completely the opposite of managing mapping/pinning dynamically as
> + * required by RamDiscardManager. We would have to special-case sections
> + * with a RamDiscardManager.
> + */
> + return ram_block_discard_disable(state);
> + }
> +}
> +
> +VFIODevice *vfio_container_dev_iter_next(VFIOContainer *container,
> + VFIODevice *curr)
> +{
> + VFIOGroup *group;
> +
> + if (!curr) {
> + group = QLIST_FIRST(&container->group_list);
> + } else {
> + if (curr->next.le_next) {
> + return curr->next.le_next;
> + }
> + group = curr->group->container_next.le_next;
> + }
> +
> + if (!group) {
> + return NULL;
> + }
> + return QLIST_FIRST(&group->device_list);
> +}
> +
> +static int vfio_dma_unmap_bitmap(VFIOContainer *container,
> + hwaddr iova, ram_addr_t size,
> + IOMMUTLBEntry *iotlb)
> +{
> + struct vfio_iommu_type1_dma_unmap *unmap;
> + struct vfio_bitmap *bitmap;
> + VFIOBitmap vbmap;
> + int ret;
> +
> + ret = vfio_bitmap_alloc(&vbmap, size);
> + if (ret) {
> + return ret;
> + }
> +
> + unmap = g_malloc0(sizeof(*unmap) + sizeof(*bitmap));
> +
> + unmap->argsz = sizeof(*unmap) + sizeof(*bitmap);
> + unmap->iova = iova;
> + unmap->size = size;
> + unmap->flags |= VFIO_DMA_UNMAP_FLAG_GET_DIRTY_BITMAP;
> + bitmap = (struct vfio_bitmap *)&unmap->data;
> +
> + /*
> + * cpu_physical_memory_set_dirty_lebitmap() supports pages in bitmap of
> + * qemu_real_host_page_size to mark those dirty. Hence set bitmap_pgsize
> + * to qemu_real_host_page_size.
> + */
> + bitmap->pgsize = qemu_real_host_page_size();
> + bitmap->size = vbmap.size;
> + bitmap->data = (__u64 *)vbmap.bitmap;
> +
> + if (vbmap.size > container->max_dirty_bitmap_size) {
> + error_report("UNMAP: Size of bitmap too big 0x%"PRIx64, vbmap.size);
> + ret = -E2BIG;
> + goto unmap_exit;
> + }
> +
> + ret = ioctl(container->fd, VFIO_IOMMU_UNMAP_DMA, unmap);
> + if (!ret) {
> + cpu_physical_memory_set_dirty_lebitmap(vbmap.bitmap,
> + iotlb->translated_addr, vbmap.pages);
> + } else {
> + error_report("VFIO_UNMAP_DMA with DIRTY_BITMAP : %m");
> + }
> +
> +unmap_exit:
> + g_free(unmap);
> + g_free(vbmap.bitmap);
> +
> + return ret;
> +}
> +
> +/*
> + * DMA - Mapping and unmapping for the "type1" IOMMU interface used on x86
> + */
> +int vfio_dma_unmap(VFIOContainer *container, hwaddr iova,
> + ram_addr_t size, IOMMUTLBEntry *iotlb)
> +{
> + struct vfio_iommu_type1_dma_unmap unmap = {
> + .argsz = sizeof(unmap),
> + .flags = 0,
> + .iova = iova,
> + .size = size,
> + };
> + bool need_dirty_sync = false;
> + int ret;
> +
> + if (iotlb && vfio_devices_all_running_and_mig_active(container)) {
> + if (!vfio_devices_all_device_dirty_tracking(container) &&
> + container->dirty_pages_supported) {
> + return vfio_dma_unmap_bitmap(container, iova, size, iotlb);
> + }
> +
> + need_dirty_sync = true;
> + }
> +
> + while (ioctl(container->fd, VFIO_IOMMU_UNMAP_DMA, &unmap)) {
> + /*
> + * The type1 backend has an off-by-one bug in the kernel (71a7d3d78e3c
> + * v4.15) where an overflow in its wrap-around check prevents us from
> + * unmapping the last page of the address space. Test for the error
> + * condition and re-try the unmap excluding the last page. The
> + * expectation is that we've never mapped the last page anyway and this
> + * unmap request comes via vIOMMU support which also makes it unlikely
> + * that this page is used. This bug was introduced well after type1 v2
> + * support was introduced, so we shouldn't need to test for v1. A fix
> + * is queued for kernel v5.0 so this workaround can be removed once
> + * affected kernels are sufficiently deprecated.
> + */
> + if (errno == EINVAL && unmap.size && !(unmap.iova + unmap.size) &&
> + container->iommu_type == VFIO_TYPE1v2_IOMMU) {
> + trace_vfio_dma_unmap_overflow_workaround();
> + unmap.size -= 1ULL << ctz64(container->pgsizes);
> + continue;
> + }
> + error_report("VFIO_UNMAP_DMA failed: %s", strerror(errno));
> + return -errno;
> + }
> +
> + if (need_dirty_sync) {
> + ret = vfio_get_dirty_bitmap(container, iova, size,
> + iotlb->translated_addr);
> + if (ret) {
> + return ret;
> + }
> + }
> +
> + return 0;
> +}
> +
> +int vfio_dma_map(VFIOContainer *container, hwaddr iova,
> + ram_addr_t size, void *vaddr, bool readonly)
> +{
> + struct vfio_iommu_type1_dma_map map = {
> + .argsz = sizeof(map),
> + .flags = VFIO_DMA_MAP_FLAG_READ,
> + .vaddr = (__u64)(uintptr_t)vaddr,
> + .iova = iova,
> + .size = size,
> + };
> +
> + if (!readonly) {
> + map.flags |= VFIO_DMA_MAP_FLAG_WRITE;
> + }
> +
> + /*
> + * Try the mapping, if it fails with EBUSY, unmap the region and try
> + * again. This shouldn't be necessary, but we sometimes see it in
> + * the VGA ROM space.
> + */
> + if (ioctl(container->fd, VFIO_IOMMU_MAP_DMA, &map) == 0 ||
> + (errno == EBUSY && vfio_dma_unmap(container, iova, size, NULL) == 0 &&
> + ioctl(container->fd, VFIO_IOMMU_MAP_DMA, &map) == 0)) {
> + return 0;
> + }
> +
> + error_report("VFIO_MAP_DMA failed: %s", strerror(errno));
> + return -errno;
> +}
> +
> +int vfio_set_dirty_page_tracking(VFIOContainer *container, bool start)
> +{
> + int ret;
> + struct vfio_iommu_type1_dirty_bitmap dirty = {
> + .argsz = sizeof(dirty),
> + };
> +
> + if (!container->dirty_pages_supported) {
> + return 0;
> + }
> +
> + if (start) {
> + dirty.flags = VFIO_IOMMU_DIRTY_PAGES_FLAG_START;
> + } else {
> + dirty.flags = VFIO_IOMMU_DIRTY_PAGES_FLAG_STOP;
> + }
> +
> + ret = ioctl(container->fd, VFIO_IOMMU_DIRTY_PAGES, &dirty);
> + if (ret) {
> + ret = -errno;
> + error_report("Failed to set dirty tracking flag 0x%x errno: %d",
> + dirty.flags, errno);
> + }
> +
> + return ret;
> +}
> +
> +int vfio_query_dirty_bitmap(VFIOContainer *container, VFIOBitmap *vbmap,
> + hwaddr iova, hwaddr size)
> +{
> + struct vfio_iommu_type1_dirty_bitmap *dbitmap;
> + struct vfio_iommu_type1_dirty_bitmap_get *range;
> + int ret;
> +
> + dbitmap = g_malloc0(sizeof(*dbitmap) + sizeof(*range));
> +
> + dbitmap->argsz = sizeof(*dbitmap) + sizeof(*range);
> + dbitmap->flags = VFIO_IOMMU_DIRTY_PAGES_FLAG_GET_BITMAP;
> + range = (struct vfio_iommu_type1_dirty_bitmap_get *)&dbitmap->data;
> + range->iova = iova;
> + range->size = size;
> +
> + /*
> + * cpu_physical_memory_set_dirty_lebitmap() supports pages in bitmap of
> + * qemu_real_host_page_size to mark those dirty. Hence set bitmap's pgsize
> + * to qemu_real_host_page_size.
> + */
> + range->bitmap.pgsize = qemu_real_host_page_size();
> + range->bitmap.size = vbmap->size;
> + range->bitmap.data = (__u64 *)vbmap->bitmap;
> +
> + ret = ioctl(container->fd, VFIO_IOMMU_DIRTY_PAGES, dbitmap);
> + if (ret) {
> + ret = -errno;
> + error_report("Failed to get dirty bitmap for iova: 0x%"PRIx64
> + " size: 0x%"PRIx64" err: %d", (uint64_t)range->iova,
> + (uint64_t)range->size, errno);
> + }
> +
> + g_free(dbitmap);
> +
> + return ret;
> +}
> +
> +static void vfio_listener_release(VFIOContainer *container)
> +{
> + memory_listener_unregister(&container->listener);
> + if (container->iommu_type == VFIO_SPAPR_TCE_v2_IOMMU) {
> + memory_listener_unregister(&container->prereg_listener);
> + }
> +}
> +
> +int vfio_container_add_section_window(VFIOContainer *container,
> + MemoryRegionSection *section,
> + Error **errp)
> +{
> + VFIOHostDMAWindow *hostwin;
> + hwaddr pgsize = 0;
> + int ret;
> +
> + if (container->iommu_type != VFIO_SPAPR_TCE_v2_IOMMU) {
> + return 0;
> + }
> +
> + /* For now intersections are not allowed, we may relax this later */
> + QLIST_FOREACH(hostwin, &container->hostwin_list, hostwin_next) {
> + if (ranges_overlap(hostwin->min_iova,
> + hostwin->max_iova - hostwin->min_iova + 1,
> + section->offset_within_address_space,
> + int128_get64(section->size))) {
> + error_setg(errp,
> + "region [0x%"PRIx64",0x%"PRIx64"] overlaps with existing"
> + "host DMA window [0x%"PRIx64",0x%"PRIx64"]",
> + section->offset_within_address_space,
> + section->offset_within_address_space +
> + int128_get64(section->size) - 1,
> + hostwin->min_iova, hostwin->max_iova);
> + return -EINVAL;
> + }
> + }
> +
> + ret = vfio_spapr_create_window(container, section, &pgsize);
> + if (ret) {
> + error_setg_errno(errp, -ret, "Failed to create SPAPR window");
> + return ret;
> + }
> +
> + vfio_host_win_add(container, section->offset_within_address_space,
> + section->offset_within_address_space +
> + int128_get64(section->size) - 1, pgsize);
> +#ifdef CONFIG_KVM
> + if (kvm_enabled()) {
> + VFIOGroup *group;
> + IOMMUMemoryRegion *iommu_mr = IOMMU_MEMORY_REGION(section->mr);
> + struct kvm_vfio_spapr_tce param;
> + struct kvm_device_attr attr = {
> + .group = KVM_DEV_VFIO_GROUP,
> + .attr = KVM_DEV_VFIO_GROUP_SET_SPAPR_TCE,
> + .addr = (uint64_t)(unsigned long)¶m,
> + };
> +
> + if (!memory_region_iommu_get_attr(iommu_mr, IOMMU_ATTR_SPAPR_TCE_FD,
> + ¶m.tablefd)) {
> + QLIST_FOREACH(group, &container->group_list, container_next) {
> + param.groupfd = group->fd;
> + if (ioctl(vfio_kvm_device_fd, KVM_SET_DEVICE_ATTR, &attr)) {
> + error_report("vfio: failed to setup fd %d "
> + "for a group with fd %d: %s",
> + param.tablefd, param.groupfd,
> + strerror(errno));
> + return 0;
> + }
> + trace_vfio_spapr_group_attach(param.groupfd, param.tablefd);
> + }
> + }
> + }
> +#endif
> + return 0;
> +}
> +
> +void vfio_container_del_section_window(VFIOContainer *container,
> + MemoryRegionSection *section)
> +{
> + if (container->iommu_type != VFIO_SPAPR_TCE_v2_IOMMU) {
> + return;
> + }
> +
> + vfio_spapr_remove_window(container,
> + section->offset_within_address_space);
> + if (vfio_host_win_del(container,
> + section->offset_within_address_space,
> + section->offset_within_address_space +
> + int128_get64(section->size) - 1) < 0) {
> + hw_error("%s: Cannot delete missing window at %"HWADDR_PRIx,
> + __func__, section->offset_within_address_space);
> + }
> +}
> +
> +static struct vfio_info_cap_header *
> +vfio_get_iommu_type1_info_cap(struct vfio_iommu_type1_info *info, uint16_t id)
> +{
> + if (!(info->flags & VFIO_IOMMU_INFO_CAPS)) {
> + return NULL;
> + }
> +
> + return vfio_get_cap((void *)info, info->cap_offset, id);
> +}
> +
> +bool vfio_get_info_dma_avail(struct vfio_iommu_type1_info *info,
> + unsigned int *avail)
> +{
> + struct vfio_info_cap_header *hdr;
> + struct vfio_iommu_type1_info_dma_avail *cap;
> +
> + /* If the capability cannot be found, assume no DMA limiting */
> + hdr = vfio_get_iommu_type1_info_cap(info,
> + VFIO_IOMMU_TYPE1_INFO_DMA_AVAIL);
> + if (hdr == NULL) {
> + return false;
> + }
> +
> + if (avail != NULL) {
> + cap = (void *) hdr;
> + *avail = cap->avail;
> + }
> +
> + return true;
> +}
> +
> +static void vfio_kvm_device_add_group(VFIOGroup *group)
> +{
> + vfio_kvm_device_add_fd(group->fd);
> +}
> +
> +static void vfio_kvm_device_del_group(VFIOGroup *group)
> +{
> + vfio_kvm_device_del_fd(group->fd);
> +}
> +
> +/*
> + * vfio_get_iommu_type - selects the richest iommu_type (v2 first)
> + */
> +static int vfio_get_iommu_type(VFIOContainer *container,
> + Error **errp)
> +{
> + int iommu_types[] = { VFIO_TYPE1v2_IOMMU, VFIO_TYPE1_IOMMU,
> + VFIO_SPAPR_TCE_v2_IOMMU, VFIO_SPAPR_TCE_IOMMU };
> + int i;
> +
> + for (i = 0; i < ARRAY_SIZE(iommu_types); i++) {
> + if (ioctl(container->fd, VFIO_CHECK_EXTENSION, iommu_types[i])) {
> + return iommu_types[i];
> + }
> + }
> + error_setg(errp, "No available IOMMU models");
> + return -EINVAL;
> +}
> +
> +static int vfio_init_container(VFIOContainer *container, int group_fd,
> + Error **errp)
> +{
> + int iommu_type, ret;
> +
> + iommu_type = vfio_get_iommu_type(container, errp);
> + if (iommu_type < 0) {
> + return iommu_type;
> + }
> +
> + ret = ioctl(group_fd, VFIO_GROUP_SET_CONTAINER, &container->fd);
> + if (ret) {
> + error_setg_errno(errp, errno, "Failed to set group container");
> + return -errno;
> + }
> +
> + while (ioctl(container->fd, VFIO_SET_IOMMU, iommu_type)) {
> + if (iommu_type == VFIO_SPAPR_TCE_v2_IOMMU) {
> + /*
> + * On sPAPR, despite the IOMMU subdriver always advertises v1 and
> + * v2, the running platform may not support v2 and there is no
> + * way to guess it until an IOMMU group gets added to the container.
> + * So in case it fails with v2, try v1 as a fallback.
> + */
> + iommu_type = VFIO_SPAPR_TCE_IOMMU;
> + continue;
> + }
> + error_setg_errno(errp, errno, "Failed to set iommu for container");
> + return -errno;
> + }
> +
> + container->iommu_type = iommu_type;
> + return 0;
> +}
> +
> +static int vfio_get_iommu_info(VFIOContainer *container,
> + struct vfio_iommu_type1_info **info)
> +{
> +
> + size_t argsz = sizeof(struct vfio_iommu_type1_info);
> +
> + *info = g_new0(struct vfio_iommu_type1_info, 1);
> +again:
> + (*info)->argsz = argsz;
> +
> + if (ioctl(container->fd, VFIO_IOMMU_GET_INFO, *info)) {
> + g_free(*info);
> + *info = NULL;
> + return -errno;
> + }
> +
> + if (((*info)->argsz > argsz)) {
> + argsz = (*info)->argsz;
> + *info = g_realloc(*info, argsz);
> + goto again;
> + }
> +
> + return 0;
> +}
> +
> +static struct vfio_info_cap_header *
> +vfio_get_iommu_info_cap(struct vfio_iommu_type1_info *info, uint16_t id)
> +{
> + struct vfio_info_cap_header *hdr;
> + void *ptr = info;
> +
> + if (!(info->flags & VFIO_IOMMU_INFO_CAPS)) {
> + return NULL;
> + }
> +
> + for (hdr = ptr + info->cap_offset; hdr != ptr; hdr = ptr + hdr->next) {
> + if (hdr->id == id) {
> + return hdr;
> + }
> + }
> +
> + return NULL;
> +}
> +
> +static void vfio_get_iommu_info_migration(VFIOContainer *container,
> + struct vfio_iommu_type1_info *info)
> +{
> + struct vfio_info_cap_header *hdr;
> + struct vfio_iommu_type1_info_cap_migration *cap_mig;
> +
> + hdr = vfio_get_iommu_info_cap(info, VFIO_IOMMU_TYPE1_INFO_CAP_MIGRATION);
> + if (!hdr) {
> + return;
> + }
> +
> + cap_mig = container_of(hdr, struct vfio_iommu_type1_info_cap_migration,
> + header);
> +
> + /*
> + * cpu_physical_memory_set_dirty_lebitmap() supports pages in bitmap of
> + * qemu_real_host_page_size to mark those dirty.
> + */
> + if (cap_mig->pgsize_bitmap & qemu_real_host_page_size()) {
> + container->dirty_pages_supported = true;
> + container->max_dirty_bitmap_size = cap_mig->max_dirty_bitmap_size;
> + container->dirty_pgsizes = cap_mig->pgsize_bitmap;
> + }
> +}
> +
> +static int vfio_connect_container(VFIOGroup *group, AddressSpace *as,
> + Error **errp)
> +{
> + VFIOContainer *container;
> + int ret, fd;
> + VFIOAddressSpace *space;
> +
> + space = vfio_get_address_space(as);
> +
> + /*
> + * VFIO is currently incompatible with discarding of RAM insofar as the
> + * madvise to purge (zap) the page from QEMU's address space does not
> + * interact with the memory API and therefore leaves stale virtual to
> + * physical mappings in the IOMMU if the page was previously pinned. We
> + * therefore set discarding broken for each group added to a container,
> + * whether the container is used individually or shared. This provides
> + * us with options to allow devices within a group to opt-in and allow
> + * discarding, so long as it is done consistently for a group (for instance
> + * if the device is an mdev device where it is known that the host vendor
> + * driver will never pin pages outside of the working set of the guest
> + * driver, which would thus not be discarding candidates).
> + *
> + * The first opportunity to induce pinning occurs here where we attempt to
> + * attach the group to existing containers within the AddressSpace. If any
> + * pages are already zapped from the virtual address space, such as from
> + * previous discards, new pinning will cause valid mappings to be
> + * re-established. Likewise, when the overall MemoryListener for a new
> + * container is registered, a replay of mappings within the AddressSpace
> + * will occur, re-establishing any previously zapped pages as well.
> + *
> + * Especially virtio-balloon is currently only prevented from discarding
> + * new memory, it will not yet set ram_block_discard_set_required() and
> + * therefore, neither stops us here or deals with the sudden memory
> + * consumption of inflated memory.
> + *
> + * We do support discarding of memory coordinated via the RamDiscardManager
> + * with some IOMMU types. vfio_ram_block_discard_disable() handles the
> + * details once we know which type of IOMMU we are using.
> + */
> +
> + QLIST_FOREACH(container, &space->containers, next) {
> + if (!ioctl(group->fd, VFIO_GROUP_SET_CONTAINER, &container->fd)) {
> + ret = vfio_ram_block_discard_disable(container, true);
> + if (ret) {
> + error_setg_errno(errp, -ret,
> + "Cannot set discarding of RAM broken");
> + if (ioctl(group->fd, VFIO_GROUP_UNSET_CONTAINER,
> + &container->fd)) {
> + error_report("vfio: error disconnecting group %d from"
> + " container", group->groupid);
> + }
> + return ret;
> + }
> + group->container = container;
> + QLIST_INSERT_HEAD(&container->group_list, group, container_next);
> + vfio_kvm_device_add_group(group);
> + return 0;
> + }
> + }
> +
> + fd = qemu_open_old("/dev/vfio/vfio", O_RDWR);
> + if (fd < 0) {
> + error_setg_errno(errp, errno, "failed to open /dev/vfio/vfio");
> + ret = -errno;
> + goto put_space_exit;
> + }
> +
> + ret = ioctl(fd, VFIO_GET_API_VERSION);
> + if (ret != VFIO_API_VERSION) {
> + error_setg(errp, "supported vfio version: %d, "
> + "reported version: %d", VFIO_API_VERSION, ret);
> + ret = -EINVAL;
> + goto close_fd_exit;
> + }
> +
> + container = g_malloc0(sizeof(*container));
> + container->space = space;
> + container->fd = fd;
> + container->error = NULL;
> + container->dirty_pages_supported = false;
> + container->dma_max_mappings = 0;
> + QLIST_INIT(&container->giommu_list);
> + QLIST_INIT(&container->hostwin_list);
> + QLIST_INIT(&container->vrdl_list);
> +
> + ret = vfio_init_container(container, group->fd, errp);
> + if (ret) {
> + goto free_container_exit;
> + }
> +
> + ret = vfio_ram_block_discard_disable(container, true);
> + if (ret) {
> + error_setg_errno(errp, -ret, "Cannot set discarding of RAM broken");
> + goto free_container_exit;
> + }
> +
> + switch (container->iommu_type) {
> + case VFIO_TYPE1v2_IOMMU:
> + case VFIO_TYPE1_IOMMU:
> + {
> + struct vfio_iommu_type1_info *info;
> +
> + ret = vfio_get_iommu_info(container, &info);
> + if (ret) {
> + error_setg_errno(errp, -ret, "Failed to get VFIO IOMMU info");
> + goto enable_discards_exit;
> + }
> +
> + if (info->flags & VFIO_IOMMU_INFO_PGSIZES) {
> + container->pgsizes = info->iova_pgsizes;
> + } else {
> + container->pgsizes = qemu_real_host_page_size();
> + }
> +
> + if (!vfio_get_info_dma_avail(info, &container->dma_max_mappings)) {
> + container->dma_max_mappings = 65535;
> + }
> + vfio_get_iommu_info_migration(container, info);
> + g_free(info);
> +
> + /*
> + * FIXME: We should parse VFIO_IOMMU_TYPE1_INFO_CAP_IOVA_RANGE
> + * information to get the actual window extent rather than assume
> + * a 64-bit IOVA address space.
> + */
> + vfio_host_win_add(container, 0, (hwaddr)-1, container->pgsizes);
> +
> + break;
> + }
> + case VFIO_SPAPR_TCE_v2_IOMMU:
> + case VFIO_SPAPR_TCE_IOMMU:
> + {
> + struct vfio_iommu_spapr_tce_info info;
> + bool v2 = container->iommu_type == VFIO_SPAPR_TCE_v2_IOMMU;
> +
> + /*
> + * The host kernel code implementing VFIO_IOMMU_DISABLE is called
> + * when container fd is closed so we do not call it explicitly
> + * in this file.
> + */
> + if (!v2) {
> + ret = ioctl(fd, VFIO_IOMMU_ENABLE);
> + if (ret) {
> + error_setg_errno(errp, errno, "failed to enable container");
> + ret = -errno;
> + goto enable_discards_exit;
> + }
> + } else {
> + container->prereg_listener = vfio_prereg_listener;
> +
> + memory_listener_register(&container->prereg_listener,
> + &address_space_memory);
> + if (container->error) {
> + memory_listener_unregister(&container->prereg_listener);
> + ret = -1;
> + error_propagate_prepend(errp, container->error,
> + "RAM memory listener initialization failed: ");
> + goto enable_discards_exit;
> + }
> + }
> +
> + info.argsz = sizeof(info);
> + ret = ioctl(fd, VFIO_IOMMU_SPAPR_TCE_GET_INFO, &info);
> + if (ret) {
> + error_setg_errno(errp, errno,
> + "VFIO_IOMMU_SPAPR_TCE_GET_INFO failed");
> + ret = -errno;
> + if (v2) {
> + memory_listener_unregister(&container->prereg_listener);
> + }
> + goto enable_discards_exit;
> + }
> +
> + if (v2) {
> + container->pgsizes = info.ddw.pgsizes;
> + /*
> + * There is a default window in just created container.
> + * To make region_add/del simpler, we better remove this
> + * window now and let those iommu_listener callbacks
> + * create/remove them when needed.
> + */
> + ret = vfio_spapr_remove_window(container, info.dma32_window_start);
> + if (ret) {
> + error_setg_errno(errp, -ret,
> + "failed to remove existing window");
> + goto enable_discards_exit;
> + }
> + } else {
> + /* The default table uses 4K pages */
> + container->pgsizes = 0x1000;
> + vfio_host_win_add(container, info.dma32_window_start,
> + info.dma32_window_start +
> + info.dma32_window_size - 1,
> + 0x1000);
> + }
> + }
> + }
> +
> + vfio_kvm_device_add_group(group);
> +
> + QLIST_INIT(&container->group_list);
> + QLIST_INSERT_HEAD(&space->containers, container, next);
> +
> + group->container = container;
> + QLIST_INSERT_HEAD(&container->group_list, group, container_next);
> +
> + container->listener = vfio_memory_listener;
> +
> + memory_listener_register(&container->listener, container->space->as);
> +
> + if (container->error) {
> + ret = -1;
> + error_propagate_prepend(errp, container->error,
> + "memory listener initialization failed: ");
> + goto listener_release_exit;
> + }
> +
> + container->initialized = true;
> +
> + return 0;
> +listener_release_exit:
> + QLIST_REMOVE(group, container_next);
> + QLIST_REMOVE(container, next);
> + vfio_kvm_device_del_group(group);
> + vfio_listener_release(container);
> +
> +enable_discards_exit:
> + vfio_ram_block_discard_disable(container, false);
> +
> +free_container_exit:
> + g_free(container);
> +
> +close_fd_exit:
> + close(fd);
> +
> +put_space_exit:
> + vfio_put_address_space(space);
> +
> + return ret;
> +}
> +
> +static void vfio_disconnect_container(VFIOGroup *group)
> +{
> + VFIOContainer *container = group->container;
> +
> + QLIST_REMOVE(group, container_next);
> + group->container = NULL;
> +
> + /*
> + * Explicitly release the listener first before unset container,
> + * since unset may destroy the backend container if it's the last
> + * group.
> + */
> + if (QLIST_EMPTY(&container->group_list)) {
> + vfio_listener_release(container);
> + }
> +
> + if (ioctl(group->fd, VFIO_GROUP_UNSET_CONTAINER, &container->fd)) {
> + error_report("vfio: error disconnecting group %d from container",
> + group->groupid);
> + }
> +
> + if (QLIST_EMPTY(&container->group_list)) {
> + VFIOAddressSpace *space = container->space;
> + VFIOGuestIOMMU *giommu, *tmp;
> + VFIOHostDMAWindow *hostwin, *next;
> +
> + QLIST_REMOVE(container, next);
> +
> + QLIST_FOREACH_SAFE(giommu, &container->giommu_list, giommu_next, tmp) {
> + memory_region_unregister_iommu_notifier(
> + MEMORY_REGION(giommu->iommu_mr), &giommu->n);
> + QLIST_REMOVE(giommu, giommu_next);
> + g_free(giommu);
> + }
> +
> + QLIST_FOREACH_SAFE(hostwin, &container->hostwin_list, hostwin_next,
> + next) {
> + QLIST_REMOVE(hostwin, hostwin_next);
> + g_free(hostwin);
> + }
> +
> + trace_vfio_disconnect_container(container->fd);
> + close(container->fd);
> + g_free(container);
> +
> + vfio_put_address_space(space);
> + }
> +}
> +
> +VFIOGroup *vfio_get_group(int groupid, AddressSpace *as, Error **errp)
> +{
> + VFIOGroup *group;
> + char path[32];
> + struct vfio_group_status status = { .argsz = sizeof(status) };
> +
> + QLIST_FOREACH(group, &vfio_group_list, next) {
> + if (group->groupid == groupid) {
> + /* Found it. Now is it already in the right context? */
> + if (group->container->space->as == as) {
> + return group;
> + } else {
> + error_setg(errp, "group %d used in multiple address spaces",
> + group->groupid);
> + return NULL;
> + }
> + }
> + }
> +
> + group = g_malloc0(sizeof(*group));
> +
> + snprintf(path, sizeof(path), "/dev/vfio/%d", groupid);
> + group->fd = qemu_open_old(path, O_RDWR);
> + if (group->fd < 0) {
> + error_setg_errno(errp, errno, "failed to open %s", path);
> + goto free_group_exit;
> + }
> +
> + if (ioctl(group->fd, VFIO_GROUP_GET_STATUS, &status)) {
> + error_setg_errno(errp, errno, "failed to get group %d status", groupid);
> + goto close_fd_exit;
> + }
> +
> + if (!(status.flags & VFIO_GROUP_FLAGS_VIABLE)) {
> + error_setg(errp, "group %d is not viable", groupid);
> + error_append_hint(errp,
> + "Please ensure all devices within the iommu_group "
> + "are bound to their vfio bus driver.\n");
> + goto close_fd_exit;
> + }
> +
> + group->groupid = groupid;
> + QLIST_INIT(&group->device_list);
> +
> + if (vfio_connect_container(group, as, errp)) {
> + error_prepend(errp, "failed to setup container for group %d: ",
> + groupid);
> + goto close_fd_exit;
> + }
> +
> + QLIST_INSERT_HEAD(&vfio_group_list, group, next);
> +
> + return group;
> +
> +close_fd_exit:
> + close(group->fd);
> +
> +free_group_exit:
> + g_free(group);
> +
> + return NULL;
> +}
> +
> +void vfio_put_group(VFIOGroup *group)
> +{
> + if (!group || !QLIST_EMPTY(&group->device_list)) {
> + return;
> + }
> +
> + if (!group->ram_block_discard_allowed) {
> + vfio_ram_block_discard_disable(group->container, false);
> + }
> + vfio_kvm_device_del_group(group);
> + vfio_disconnect_container(group);
> + QLIST_REMOVE(group, next);
> + trace_vfio_put_group(group->fd);
> + close(group->fd);
> + g_free(group);
> +}
> +
> +int vfio_get_device(VFIOGroup *group, const char *name,
> + VFIODevice *vbasedev, Error **errp)
> +{
> + g_autofree struct vfio_device_info *info = NULL;
> + int fd;
> +
> + fd = ioctl(group->fd, VFIO_GROUP_GET_DEVICE_FD, name);
> + if (fd < 0) {
> + error_setg_errno(errp, errno, "error getting device from group %d",
> + group->groupid);
> + error_append_hint(errp,
> + "Verify all devices in group %d are bound to vfio-<bus> "
> + "or pci-stub and not already in use\n", group->groupid);
> + return fd;
> + }
> +
> + info = vfio_get_device_info(fd);
> + if (!info) {
> + error_setg_errno(errp, errno, "error getting device info");
> + close(fd);
> + return -1;
> + }
> +
> + /*
> + * Set discarding of RAM as not broken for this group if the driver knows
> + * the device operates compatibly with discarding. Setting must be
> + * consistent per group, but since compatibility is really only possible
> + * with mdev currently, we expect singleton groups.
> + */
> + if (vbasedev->ram_block_discard_allowed !=
> + group->ram_block_discard_allowed) {
> + if (!QLIST_EMPTY(&group->device_list)) {
> + error_setg(errp, "Inconsistent setting of support for discarding "
> + "RAM (e.g., balloon) within group");
> + close(fd);
> + return -1;
> + }
> +
> + if (!group->ram_block_discard_allowed) {
> + group->ram_block_discard_allowed = true;
> + vfio_ram_block_discard_disable(group->container, false);
> + }
> + }
> +
> + vbasedev->fd = fd;
> + vbasedev->group = group;
> + QLIST_INSERT_HEAD(&group->device_list, vbasedev, next);
> +
> + vbasedev->num_irqs = info->num_irqs;
> + vbasedev->num_regions = info->num_regions;
> + vbasedev->flags = info->flags;
> +
> + trace_vfio_get_device(name, info->flags, info->num_regions, info->num_irqs);
> +
> + vbasedev->reset_works = !!(info->flags & VFIO_DEVICE_FLAGS_RESET);
> +
> + return 0;
> +}
> +
> +void vfio_put_base_device(VFIODevice *vbasedev)
> +{
> + if (!vbasedev->group) {
> + return;
> + }
> + QLIST_REMOVE(vbasedev, next);
> + vbasedev->group = NULL;
> + trace_vfio_put_base_device(vbasedev->fd);
> + close(vbasedev->fd);
> +}
> +
> +/*
> + * Interfaces for IBM EEH (Enhanced Error Handling)
> + */
> +static bool vfio_eeh_container_ok(VFIOContainer *container)
> +{
> + /*
> + * As of 2016-03-04 (linux-4.5) the host kernel EEH/VFIO
> + * implementation is broken if there are multiple groups in a
> + * container. The hardware works in units of Partitionable
> + * Endpoints (== IOMMU groups) and the EEH operations naively
> + * iterate across all groups in the container, without any logic
> + * to make sure the groups have their state synchronized. For
> + * certain operations (ENABLE) that might be ok, until an error
> + * occurs, but for others (GET_STATE) it's clearly broken.
> + */
> +
> + /*
> + * XXX Once fixed kernels exist, test for them here
> + */
> +
> + if (QLIST_EMPTY(&container->group_list)) {
> + return false;
> + }
> +
> + if (QLIST_NEXT(QLIST_FIRST(&container->group_list), container_next)) {
> + return false;
> + }
> +
> + return true;
> +}
> +
> +static int vfio_eeh_container_op(VFIOContainer *container, uint32_t op)
> +{
> + struct vfio_eeh_pe_op pe_op = {
> + .argsz = sizeof(pe_op),
> + .op = op,
> + };
> + int ret;
> +
> + if (!vfio_eeh_container_ok(container)) {
> + error_report("vfio/eeh: EEH_PE_OP 0x%x: "
> + "kernel requires a container with exactly one group", op);
> + return -EPERM;
> + }
> +
> + ret = ioctl(container->fd, VFIO_EEH_PE_OP, &pe_op);
> + if (ret < 0) {
> + error_report("vfio/eeh: EEH_PE_OP 0x%x failed: %m", op);
> + return -errno;
> + }
> +
> + return ret;
> +}
> +
> +static VFIOContainer *vfio_eeh_as_container(AddressSpace *as)
> +{
> + VFIOAddressSpace *space = vfio_get_address_space(as);
> + VFIOContainer *container = NULL;
> +
> + if (QLIST_EMPTY(&space->containers)) {
> + /* No containers to act on */
> + goto out;
> + }
> +
> + container = QLIST_FIRST(&space->containers);
> +
> + if (QLIST_NEXT(container, next)) {
> + /*
> + * We don't yet have logic to synchronize EEH state across
> + * multiple containers
> + */
> + container = NULL;
> + goto out;
> + }
> +
> +out:
> + vfio_put_address_space(space);
> + return container;
> +}
> +
> +bool vfio_eeh_as_ok(AddressSpace *as)
> +{
> + VFIOContainer *container = vfio_eeh_as_container(as);
> +
> + return (container != NULL) && vfio_eeh_container_ok(container);
> +}
> +
> +int vfio_eeh_as_op(AddressSpace *as, uint32_t op)
> +{
> + VFIOContainer *container = vfio_eeh_as_container(as);
> +
> + if (!container) {
> + return -ENODEV;
> + }
> + return vfio_eeh_container_op(container, op);
> +}
> diff --git a/hw/vfio/meson.build b/hw/vfio/meson.build
> index 3746c9f984..2a6912c940 100644
> --- a/hw/vfio/meson.build
> +++ b/hw/vfio/meson.build
> @@ -2,6 +2,7 @@ vfio_ss = ss.source_set()
> vfio_ss.add(files(
> 'helpers.c',
> 'common.c',
> + 'container.c',
> 'spapr.c',
> 'migration.c',
> ))
> diff --git a/include/hw/vfio/vfio-common.h b/include/hw/vfio/vfio-common.h
> index 598c3ce079..bb7f9fe9c4 100644
> --- a/include/hw/vfio/vfio-common.h
> +++ b/include/hw/vfio/vfio-common.h
> @@ -33,6 +33,8 @@
>
> #define VFIO_MSG_PREFIX "vfio %s: "
>
> +extern const MemoryListener vfio_memory_listener;
> +
> enum {
> VFIO_DEVICE_TYPE_PCI = 0,
> VFIO_DEVICE_TYPE_PLATFORM = 1,
> @@ -196,6 +198,38 @@ typedef struct VFIODisplay {
> } dmabuf;
> } VFIODisplay;
>
> +typedef struct {
> + unsigned long *bitmap;
> + hwaddr size;
> + hwaddr pages;
> +} VFIOBitmap;
> +
> +void vfio_host_win_add(VFIOContainer *container,
> + hwaddr min_iova, hwaddr max_iova,
> + uint64_t iova_pgsizes);
> +int vfio_host_win_del(VFIOContainer *container, hwaddr min_iova,
> + hwaddr max_iova);
> +VFIOAddressSpace *vfio_get_address_space(AddressSpace *as);
> +void vfio_put_address_space(VFIOAddressSpace *space);
> +bool vfio_devices_all_running_and_saving(VFIOContainer *container);
> +
> +/* container->fd */
> +VFIODevice *vfio_container_dev_iter_next(VFIOContainer *container,
> + VFIODevice *curr);
> +int vfio_dma_unmap(VFIOContainer *container, hwaddr iova,
> + ram_addr_t size, IOMMUTLBEntry *iotlb);
> +int vfio_dma_map(VFIOContainer *container, hwaddr iova,
> + ram_addr_t size, void *vaddr, bool readonly);
> +int vfio_set_dirty_page_tracking(VFIOContainer *container, bool start);
> +int vfio_query_dirty_bitmap(VFIOContainer *container, VFIOBitmap *vbmap,
> + hwaddr iova, hwaddr size);
> +
> +int vfio_container_add_section_window(VFIOContainer *container,
> + MemoryRegionSection *section,
> + Error **errp);
> +void vfio_container_del_section_window(VFIOContainer *container,
> + MemoryRegionSection *section);
> +
> void vfio_put_base_device(VFIODevice *vbasedev);
> void vfio_disable_irqindex(VFIODevice *vbasedev, int index);
> void vfio_unmask_single_irqindex(VFIODevice *vbasedev, int index);
> @@ -220,6 +254,8 @@ struct vfio_device_info *vfio_get_device_info(int fd);
> int vfio_get_device(VFIOGroup *group, const char *name,
> VFIODevice *vbasedev, Error **errp);
>
> +extern int vfio_kvm_device_fd;
> +
> int vfio_kvm_device_add_fd(int fd);
> int vfio_kvm_device_del_fd(int fd);
>
> @@ -260,4 +296,13 @@ int vfio_spapr_remove_window(VFIOContainer *container,
> bool vfio_migration_realize(VFIODevice *vbasedev, Error **errp);
> void vfio_migration_exit(VFIODevice *vbasedev);
>
> +int vfio_bitmap_alloc(VFIOBitmap *vbmap, hwaddr size);
> +bool vfio_devices_all_running_and_mig_active(VFIOContainer *container);
> +bool vfio_devices_all_device_dirty_tracking(VFIOContainer *container);
> +int vfio_devices_query_dirty_bitmap(VFIOContainer *container,
> + VFIOBitmap *vbmap, hwaddr iova,
> + hwaddr size);
> +int vfio_get_dirty_bitmap(VFIOContainer *container, uint64_t iova,
> + uint64_t size, ram_addr_t ram_addr);
> +
> #endif /* HW_VFIO_VFIO_COMMON_H */
Thanks
Eric
>-----Original Message----- >From: Eric Auger <eric.auger@redhat.com> >Sent: Wednesday, September 20, 2023 9:12 PM >Subject: Re: [PATCH v1 08/22] vfio/common: Move legacy VFIO backend code >into separate container.c > >Hi, > >On 8/30/23 12:37, Zhenzhong Duan wrote: >> From: Yi Liu <yi.l.liu@intel.com> >> >> Move all the code really dependent on the legacy VFIO container/group >> into a separate file: container.c. What does remain in common.c is >> the code related to VFIOAddressSpace, MemoryListeners, migration and >> all other general operations. >> >> Move struct VFIOBitmap declaration to vfio-common.h also for containter.c >> usage. >note: this may be done in the 3d patch since vfio_bitmap_alloc could >land in helpers.c Good idea, will do. Thanks Zhenzhong
© 2016 - 2026 Red Hat, Inc.