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Subject: [PATCH v8 03/28] vfio/container: support VFIO_DMA_UNMAP_FLAG_ALL
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Some containers can directly implement unmapping all regions;
add a new flag to support this.
Originally-by: John Johnson <john.g.johnson@oracle.com>
Signed-off-by: Elena Ufimtseva <elena.ufimtseva@oracle.com>
Signed-off-by: Jagannathan Raman <jag.raman@oracle.com>
Signed-off-by: John Levon <john.levon@nutanix.com>
---
hw/vfio/common.c | 24 +++++++----------
hw/vfio/container-base.c | 4 +--
hw/vfio/container.c | 38 +++++++++++++++++++++++++--
hw/vfio/iommufd.c | 19 +++++++++++++-
include/hw/vfio/vfio-common.h | 1 +
include/hw/vfio/vfio-container-base.h | 4 +--
6 files changed, 68 insertions(+), 22 deletions(-)
diff --git a/hw/vfio/common.c b/hw/vfio/common.c
index 6f106167fd..b49aafc40c 100644
--- a/hw/vfio/common.c
+++ b/hw/vfio/common.c
@@ -324,7 +324,7 @@ static void vfio_iommu_map_notify(IOMMUNotifier *n, IOM=
MUTLBEntry *iotlb)
}
} else {
ret =3D vfio_container_dma_unmap(bcontainer, iova,
- iotlb->addr_mask + 1, iotlb);
+ iotlb->addr_mask + 1, iotlb, 0);
if (ret) {
error_report("vfio_container_dma_unmap(%p, 0x%"HWADDR_PRIx", "
"0x%"HWADDR_PRIx") =3D %d (%s)",
@@ -348,7 +348,7 @@ static void vfio_ram_discard_notify_discard(RamDiscardL=
istener *rdl,
int ret;
=20
/* Unmap with a single call. */
- ret =3D vfio_container_dma_unmap(bcontainer, iova, size , NULL);
+ ret =3D vfio_container_dma_unmap(bcontainer, iova, size, NULL, 0);
if (ret) {
error_report("%s: vfio_container_dma_unmap() failed: %s", __func__,
strerror(-ret));
@@ -806,21 +806,15 @@ static void vfio_listener_region_del(MemoryListener *=
listener,
}
=20
if (try_unmap) {
+ int flags =3D 0;
+
if (int128_eq(llsize, int128_2_64())) {
- /* The unmap ioctl doesn't accept a full 64-bit span. */
- llsize =3D int128_rshift(llsize, 1);
- ret =3D vfio_container_dma_unmap(bcontainer, iova,
- int128_get64(llsize), NULL);
- if (ret) {
- error_report("vfio_container_dma_unmap(%p, 0x%"HWADDR_PRIx=
", "
- "0x%"HWADDR_PRIx") =3D %d (%s)",
- bcontainer, iova, int128_get64(llsize), ret,
- strerror(-ret));
- }
- iova +=3D int128_get64(llsize);
+ flags =3D VFIO_DMA_UNMAP_FLAG_ALL;
}
- ret =3D vfio_container_dma_unmap(bcontainer, iova,
- int128_get64(llsize), NULL);
+
+ ret =3D vfio_container_dma_unmap(bcontainer, iova, int128_get64(ll=
size),
+ NULL, flags);
+
if (ret) {
error_report("vfio_container_dma_unmap(%p, 0x%"HWADDR_PRIx", "
"0x%"HWADDR_PRIx") =3D %d (%s)",
diff --git a/hw/vfio/container-base.c b/hw/vfio/container-base.c
index 5e0c9700d9..db27e9c31d 100644
--- a/hw/vfio/container-base.c
+++ b/hw/vfio/container-base.c
@@ -27,12 +27,12 @@ int vfio_container_dma_map(VFIOContainerBase *bcontaine=
r,
=20
int vfio_container_dma_unmap(VFIOContainerBase *bcontainer,
hwaddr iova, ram_addr_t size,
- IOMMUTLBEntry *iotlb)
+ IOMMUTLBEntry *iotlb, int flags)
{
VFIOIOMMUClass *vioc =3D VFIO_IOMMU_GET_CLASS(bcontainer);
=20
g_assert(vioc->dma_unmap);
- return vioc->dma_unmap(bcontainer, iova, size, iotlb);
+ return vioc->dma_unmap(bcontainer, iova, size, iotlb, flags);
}
=20
bool vfio_container_add_section_window(VFIOContainerBase *bcontainer,
diff --git a/hw/vfio/container.c b/hw/vfio/container.c
index 0db0055f39..82987063e5 100644
--- a/hw/vfio/container.c
+++ b/hw/vfio/container.c
@@ -117,7 +117,7 @@ unmap_exit:
*/
static int vfio_legacy_dma_unmap(const VFIOContainerBase *bcontainer,
hwaddr iova, ram_addr_t size,
- IOMMUTLBEntry *iotlb)
+ IOMMUTLBEntry *iotlb, int flags)
{
const VFIOContainer *container =3D container_of(bcontainer, VFIOContai=
ner,
bcontainer);
@@ -140,6 +140,34 @@ static int vfio_legacy_dma_unmap(const VFIOContainerBa=
se *bcontainer,
need_dirty_sync =3D true;
}
=20
+ /* use unmap all if supported */
+ if (flags & VFIO_DMA_UNMAP_FLAG_ALL) {
+ unmap.iova =3D 0;
+ unmap.size =3D 0;
+ if (container->unmap_all_supported) {
+ ret =3D ioctl(container->fd, VFIO_IOMMU_UNMAP_DMA, unmap);
+ } else {
+ /* unmap in halves */
+ Int128 llsize =3D int128_rshift(int128_2_64(), 1);
+
+ unmap.size =3D int128_get64(llsize);
+
+ ret =3D ioctl(container->fd, VFIO_IOMMU_UNMAP_DMA, unmap);
+
+ if (ret =3D=3D 0) {
+ unmap.iova +=3D int128_get64(llsize);
+
+ ret =3D ioctl(container->fd, VFIO_IOMMU_UNMAP_DMA, unmap);
+ }
+ }
+
+ if (ret !=3D 0) {
+ return -errno;
+ }
+
+ goto out;
+ }
+
while (ioctl(container->fd, VFIO_IOMMU_UNMAP_DMA, &unmap)) {
/*
* The type1 backend has an off-by-one bug in the kernel (71a7d3d7=
8e3c
@@ -162,6 +190,7 @@ static int vfio_legacy_dma_unmap(const VFIOContainerBas=
e *bcontainer,
return -errno;
}
=20
+out:
if (need_dirty_sync) {
ret =3D vfio_get_dirty_bitmap(bcontainer, iova, size,
iotlb->translated_addr, &local_err);
@@ -199,7 +228,7 @@ static int vfio_legacy_dma_map(const VFIOContainerBase =
*bcontainer, hwaddr iova,
*/
if (ioctl(container->fd, VFIO_IOMMU_MAP_DMA, &map) =3D=3D 0 ||
(errno =3D=3D EBUSY &&
- vfio_legacy_dma_unmap(bcontainer, iova, size, NULL) =3D=3D 0 &&
+ vfio_legacy_dma_unmap(bcontainer, iova, size, NULL, 0) =3D=3D 0 &&
ioctl(container->fd, VFIO_IOMMU_MAP_DMA, &map) =3D=3D 0)) {
return 0;
}
@@ -533,6 +562,11 @@ static bool vfio_legacy_setup(VFIOContainerBase *bcont=
ainer, Error **errp)
vfio_get_info_iova_range(info, bcontainer);
=20
vfio_get_iommu_info_migration(container, info);
+
+ ret =3D ioctl(container->fd, VFIO_CHECK_EXTENSION, VFIO_UNMAP_ALL);
+
+ container->unmap_all_supported =3D (ret !=3D 0);
+
return true;
}
=20
diff --git a/hw/vfio/iommufd.c b/hw/vfio/iommufd.c
index 583b063707..e295f251c0 100644
--- a/hw/vfio/iommufd.c
+++ b/hw/vfio/iommufd.c
@@ -41,11 +41,28 @@ static int iommufd_cdev_map(const VFIOContainerBase *bc=
ontainer, hwaddr iova,
=20
static int iommufd_cdev_unmap(const VFIOContainerBase *bcontainer,
hwaddr iova, ram_addr_t size,
- IOMMUTLBEntry *iotlb)
+ IOMMUTLBEntry *iotlb, int flags)
{
const VFIOIOMMUFDContainer *container =3D
container_of(bcontainer, VFIOIOMMUFDContainer, bcontainer);
=20
+ /* unmap in halves */
+ if (flags & VFIO_DMA_UNMAP_FLAG_ALL) {
+ Int128 llsize =3D int128_rshift(int128_2_64(), 1);
+ int ret;
+
+ ret =3D iommufd_backend_unmap_dma(container->be, container->ioas_i=
d,
+ iova, int128_get64(llsize));
+ iova +=3D int128_get64(llsize);
+
+ if (ret =3D=3D 0) {
+ ret =3D iommufd_backend_unmap_dma(container->be, container->io=
as_id,
+ iova, int128_get64(llsize));
+ }
+
+ return ret;
+ }
+
/* TODO: Handle dma_unmap_bitmap with iotlb args (migration) */
return iommufd_backend_unmap_dma(container->be,
container->ioas_id, iova, size);
diff --git a/include/hw/vfio/vfio-common.h b/include/hw/vfio/vfio-common.h
index ac35136a11..f4f08eb8a6 100644
--- a/include/hw/vfio/vfio-common.h
+++ b/include/hw/vfio/vfio-common.h
@@ -84,6 +84,7 @@ typedef struct VFIOContainer {
VFIOContainerBase bcontainer;
int fd; /* /dev/vfio/vfio, empowered by the attached groups */
unsigned iommu_type;
+ bool unmap_all_supported;
QLIST_HEAD(, VFIOGroup) group_list;
} VFIOContainer;
=20
diff --git a/include/hw/vfio/vfio-container-base.h b/include/hw/vfio/vfio-c=
ontainer-base.h
index 0a863df0dc..24e48e3a07 100644
--- a/include/hw/vfio/vfio-container-base.h
+++ b/include/hw/vfio/vfio-container-base.h
@@ -76,7 +76,7 @@ int vfio_container_dma_map(VFIOContainerBase *bcontainer,
void *vaddr, bool readonly, MemoryRegion *mrp);
int vfio_container_dma_unmap(VFIOContainerBase *bcontainer,
hwaddr iova, ram_addr_t size,
- IOMMUTLBEntry *iotlb);
+ IOMMUTLBEntry *iotlb, int flags);
bool vfio_container_add_section_window(VFIOContainerBase *bcontainer,
MemoryRegionSection *section,
Error **errp);
@@ -118,7 +118,7 @@ struct VFIOIOMMUClass {
void *vaddr, bool readonly, MemoryRegion *mrp);
int (*dma_unmap)(const VFIOContainerBase *bcontainer,
hwaddr iova, ram_addr_t size,
- IOMMUTLBEntry *iotlb);
+ IOMMUTLBEntry *iotlb, int flags);
bool (*attach_device)(const char *name, VFIODevice *vbasedev,
AddressSpace *as, Error **errp);
void (*detach_device)(VFIODevice *vbasedev);
--=20
2.34.1