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Subject: [PATCH v8 17/28] vfio-user: implement
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From: Jagannathan Raman <jag.raman@oracle.com>
Add support for per-region info fds. Unlike kernel vfio, vfio-user can
have a separate fd to support mmap() of individual regions; add
->use_regfds as needed to support this difference.
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-user/common.c | 68 +++++++++++++++++++++++++++++++++++
hw/vfio-user/common.h | 2 ++
hw/vfio-user/pci.c | 2 ++
hw/vfio-user/protocol.h | 14 ++++++++
hw/vfio-user/trace-events | 1 +
hw/vfio/ap.c | 2 ++
hw/vfio/ccw.c | 2 ++
hw/vfio/container.c | 7 ++++
hw/vfio/helpers.c | 28 +++++++++++++--
hw/vfio/pci.c | 2 ++
hw/vfio/platform.c | 2 ++
include/hw/vfio/vfio-common.h | 5 ++-
12 files changed, 131 insertions(+), 4 deletions(-)
diff --git a/hw/vfio-user/common.c b/hw/vfio-user/common.c
index 55d1da4e51..7b96d715cb 100644
--- a/hw/vfio-user/common.c
+++ b/hw/vfio-user/common.c
@@ -1106,3 +1106,71 @@ int vfio_user_get_info(VFIOUserProxy *proxy, struct =
vfio_device_info *info)
=20
return 0;
}
+
+static int vfio_user_get_region_info(VFIOUserProxy *proxy,
+ struct vfio_region_info *info,
+ VFIOUserFDs *fds)
+{
+ g_autofree VFIOUserRegionInfo *msgp =3D NULL;
+ uint32_t size;
+
+ /* data returned can be larger than vfio_region_info */
+ if (info->argsz < sizeof(*info)) {
+ error_printf("vfio_user_get_region_info argsz too small\n");
+ return -E2BIG;
+ }
+ if (fds !=3D NULL && fds->send_fds !=3D 0) {
+ error_printf("vfio_user_get_region_info can't send FDs\n");
+ return -EINVAL;
+ }
+
+ size =3D info->argsz + sizeof(VFIOUserHdr);
+ msgp =3D g_malloc0(size);
+
+ vfio_user_request_msg(&msgp->hdr, VFIO_USER_DEVICE_GET_REGION_INFO,
+ sizeof(*msgp), 0);
+ msgp->argsz =3D info->argsz;
+ msgp->index =3D info->index;
+
+ vfio_user_send_wait(proxy, &msgp->hdr, fds, size);
+ if (msgp->hdr.flags & VFIO_USER_ERROR) {
+ return -msgp->hdr.error_reply;
+ }
+ trace_vfio_user_get_region_info(msgp->index, msgp->flags, msgp->size);
+
+ memcpy(info, &msgp->argsz, info->argsz);
+ return 0;
+}
+
+
+/*
+ * Socket-based io_ops
+ */
+
+static int vfio_user_io_get_region_info(VFIODevice *vbasedev,
+ struct vfio_region_info *info,
+ int *fd)
+{
+ int ret;
+ VFIOUserFDs fds =3D { 0, 1, fd};
+
+ ret =3D vfio_user_get_region_info(vbasedev->proxy, info, &fds);
+ if (ret) {
+ return ret;
+ }
+
+ if (info->index > vbasedev->num_regions) {
+ return -EINVAL;
+ }
+ /* cap_offset in valid area */
+ if ((info->flags & VFIO_REGION_INFO_FLAG_CAPS) &&
+ (info->cap_offset < sizeof(*info) || info->cap_offset > info->args=
z)) {
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+VFIODeviceIO vfio_dev_io_sock =3D {
+ .get_region_info =3D vfio_user_io_get_region_info,
+};
diff --git a/hw/vfio-user/common.h b/hw/vfio-user/common.h
index 11a80d4e7c..30a3125ea3 100644
--- a/hw/vfio-user/common.h
+++ b/hw/vfio-user/common.h
@@ -95,4 +95,6 @@ void vfio_user_set_handler(VFIODevice *vbasedev,
bool vfio_user_validate_version(VFIOUserProxy *proxy, Error **errp);
int vfio_user_get_info(VFIOUserProxy *proxy, struct vfio_device_info *info=
);
=20
+extern VFIODeviceIO vfio_dev_io_sock;
+
#endif /* VFIO_USER_COMMON_H */
diff --git a/hw/vfio-user/pci.c b/hw/vfio-user/pci.c
index 69806eb863..fdff6c99e6 100644
--- a/hw/vfio-user/pci.c
+++ b/hw/vfio-user/pci.c
@@ -108,6 +108,8 @@ static void vfio_user_pci_realize(PCIDevice *pdev, Erro=
r **errp)
vbasedev->ops =3D &vfio_user_pci_ops;
vbasedev->type =3D VFIO_DEVICE_TYPE_PCI;
vbasedev->dev =3D DEVICE(vdev);
+ vbasedev->io =3D &vfio_dev_io_sock;
+ vbasedev->use_regfds =3D true;
=20
/*
* vfio-user devices are effectively mdevs (don't use a host iommu).
diff --git a/hw/vfio-user/protocol.h b/hw/vfio-user/protocol.h
index 5f9ef1768f..6f70a48905 100644
--- a/hw/vfio-user/protocol.h
+++ b/hw/vfio-user/protocol.h
@@ -125,4 +125,18 @@ typedef struct {
uint32_t num_irqs;
} VFIOUserDeviceInfo;
=20
+/*
+ * VFIO_USER_DEVICE_GET_REGION_INFO
+ * imported from struct vfio_region_info
+ */
+typedef struct {
+ VFIOUserHdr hdr;
+ uint32_t argsz;
+ uint32_t flags;
+ uint32_t index;
+ uint32_t cap_offset;
+ uint64_t size;
+ uint64_t offset;
+} VFIOUserRegionInfo;
+
#endif /* VFIO_USER_PROTOCOL_H */
diff --git a/hw/vfio-user/trace-events b/hw/vfio-user/trace-events
index 6b06a3ed82..1860430301 100644
--- a/hw/vfio-user/trace-events
+++ b/hw/vfio-user/trace-events
@@ -7,3 +7,4 @@ vfio_user_recv_request(uint16_t cmd) " command 0x%x"
vfio_user_send_write(uint16_t id, int wrote) " id 0x%x wrote 0x%x"
vfio_user_version(uint16_t major, uint16_t minor, const char *caps) " majo=
r %d minor %d caps: %s"
vfio_user_get_info(uint32_t nregions, uint32_t nirqs) " #regions %d #irqs =
%d"
+vfio_user_get_region_info(uint32_t index, uint32_t flags, uint64_t size) "=
index %d flags 0x%x size 0x%"PRIx64
diff --git a/hw/vfio/ap.c b/hw/vfio/ap.c
index 1adce1ab40..54b1815f1d 100644
--- a/hw/vfio/ap.c
+++ b/hw/vfio/ap.c
@@ -162,6 +162,8 @@ static void vfio_ap_realize(DeviceState *dev, Error **e=
rrp)
return;
}
=20
+ vbasedev->use_regfds =3D false;
+
if (!vfio_attach_device(vbasedev->name, vbasedev,
&address_space_memory, errp)) {
goto error;
diff --git a/hw/vfio/ccw.c b/hw/vfio/ccw.c
index 8c16648819..085a3fc6e6 100644
--- a/hw/vfio/ccw.c
+++ b/hw/vfio/ccw.c
@@ -586,6 +586,8 @@ static void vfio_ccw_realize(DeviceState *dev, Error **=
errp)
goto out_unrealize;
}
=20
+ vbasedev->use_regfds =3D false;
+
if (!vfio_attach_device(cdev->mdevid, vbasedev,
&address_space_memory, errp)) {
goto out_attach_dev_err;
diff --git a/hw/vfio/container.c b/hw/vfio/container.c
index 0e1af34ce4..ddb86edb65 100644
--- a/hw/vfio/container.c
+++ b/hw/vfio/container.c
@@ -890,10 +890,17 @@ void vfio_put_base_device(VFIODevice *vbasedev)
int i;
=20
for (i =3D 0; i < vbasedev->num_regions; i++) {
+ if (vbasedev->regfds !=3D NULL && vbasedev->regfds[i] !=3D -1)=
{
+ close(vbasedev->regfds[i]);
+ }
g_free(vbasedev->regions[i]);
}
g_free(vbasedev->regions);
vbasedev->regions =3D NULL;
+ if (vbasedev->regfds !=3D NULL) {
+ g_free(vbasedev->regfds);
+ vbasedev->regfds =3D NULL;
+ }
}
=20
if (!vbasedev->group) {
diff --git a/hw/vfio/helpers.c b/hw/vfio/helpers.c
index bef1540295..4ed393420e 100644
--- a/hw/vfio/helpers.c
+++ b/hw/vfio/helpers.c
@@ -365,6 +365,12 @@ int vfio_region_setup(Object *obj, VFIODevice *vbasede=
v, VFIORegion *region,
region->size =3D info->size;
region->fd_offset =3D info->offset;
region->nr =3D index;
+ if (vbasedev->regfds !=3D NULL) {
+ region->fd =3D vbasedev->regfds[index];
+ } else {
+ region->fd =3D vbasedev->fd;
+ }
+
=20
if (region->size) {
region->mem =3D g_new0(MemoryRegion, 1);
@@ -443,7 +449,7 @@ int vfio_region_mmap(VFIORegion *region)
=20
region->mmaps[i].mmap =3D mmap(map_align, region->mmaps[i].size, p=
rot,
MAP_SHARED | MAP_FIXED,
- region->vbasedev->fd,
+ region->fd,
region->fd_offset +
region->mmaps[i].offset);
if (region->mmaps[i].mmap =3D=3D MAP_FAILED) {
@@ -568,12 +574,16 @@ int vfio_get_region_info(VFIODevice *vbasedev, int in=
dex,
struct vfio_region_info **info)
{
size_t argsz =3D sizeof(struct vfio_region_info);
+ int fd =3D -1;
int ret;
=20
/* create region cache */
if (vbasedev->regions =3D=3D NULL) {
vbasedev->regions =3D g_new0(struct vfio_region_info *,
vbasedev->num_regions);
+ if (vbasedev->use_regfds) {
+ vbasedev->regfds =3D g_new0(int, vbasedev->num_regions);
+ }
}
/* check cache */
if (vbasedev->regions[index] !=3D NULL) {
@@ -587,22 +597,33 @@ int vfio_get_region_info(VFIODevice *vbasedev, int in=
dex,
retry:
(*info)->argsz =3D argsz;
=20
- ret =3D vbasedev->io->get_region_info(vbasedev, *info);
+ ret =3D vbasedev->io->get_region_info(vbasedev, *info, &fd);
if (ret !=3D 0) {
g_free(*info);
*info =3D NULL;
+ if (vbasedev->regfds !=3D NULL) {
+ vbasedev->regfds[index] =3D -1;
+ }
+
return ret;
}
=20
if ((*info)->argsz > argsz) {
argsz =3D (*info)->argsz;
*info =3D g_realloc(*info, argsz);
+ if (fd !=3D -1) {
+ close(fd);
+ fd =3D -1;
+ }
=20
goto retry;
}
=20
/* fill cache */
vbasedev->regions[index] =3D *info;
+ if (vbasedev->regfds !=3D NULL) {
+ vbasedev->regfds[index] =3D fd;
+ }
=20
return 0;
}
@@ -775,10 +796,11 @@ static int vfio_io_device_feature(VFIODevice *vbasede=
v,
}
=20
static int vfio_io_get_region_info(VFIODevice *vbasedev,
- struct vfio_region_info *info)
+ struct vfio_region_info *info, int *fd)
{
int ret;
=20
+ *fd =3D -1;
ret =3D ioctl(vbasedev->fd, VFIO_DEVICE_GET_REGION_INFO, info);
=20
return ret < 0 ? -errno : ret;
diff --git a/hw/vfio/pci.c b/hw/vfio/pci.c
index a7084a7690..4ab3bfa2fa 100644
--- a/hw/vfio/pci.c
+++ b/hw/vfio/pci.c
@@ -3175,6 +3175,8 @@ static void vfio_realize(PCIDevice *pdev, Error **err=
p)
name =3D g_strdup(vbasedev->name);
}
=20
+ vbasedev->use_regfds =3D false;
+
if (!vfio_attach_device(name, vbasedev,
pci_device_iommu_address_space(pdev), errp)) {
goto error;
diff --git a/hw/vfio/platform.c b/hw/vfio/platform.c
index 51534fd941..a76cc6a194 100644
--- a/hw/vfio/platform.c
+++ b/hw/vfio/platform.c
@@ -575,6 +575,8 @@ static void vfio_platform_realize(DeviceState *dev, Err=
or **errp)
VFIODevice *vbasedev =3D &vdev->vbasedev;
int i;
=20
+ vbasedev->use_regfds =3D false;
+
qemu_mutex_init(&vdev->intp_mutex);
=20
trace_vfio_platform_realize(vbasedev->sysfsdev ?
diff --git a/include/hw/vfio/vfio-common.h b/include/hw/vfio/vfio-common.h
index 699e8a9376..ab7fa7135a 100644
--- a/include/hw/vfio/vfio-common.h
+++ b/include/hw/vfio/vfio-common.h
@@ -59,6 +59,7 @@ typedef struct VFIORegion {
uint32_t nr_mmaps;
VFIOMmap *mmaps;
uint8_t nr; /* cache the region number for debug */
+ int fd; /* fd to mmap() region */
} VFIORegion;
=20
typedef struct VFIOMigration {
@@ -139,6 +140,7 @@ typedef struct VFIODevice {
bool ram_block_discard_allowed;
OnOffAuto enable_migration;
bool migration_events;
+ bool use_regfds;
VFIODeviceOps *ops;
VFIODeviceIO *io;
unsigned int num_irqs;
@@ -158,6 +160,7 @@ typedef struct VFIODevice {
QLIST_ENTRY(VFIODevice) hwpt_next;
VFIOUserProxy *proxy;
struct vfio_region_info **regions;
+ int *regfds;
} VFIODevice;
=20
struct VFIODeviceOps {
@@ -202,7 +205,7 @@ struct VFIODeviceOps {
struct VFIODeviceIO {
int (*device_feature)(VFIODevice *vdev, struct vfio_device_feature *);
int (*get_region_info)(VFIODevice *vdev,
- struct vfio_region_info *info);
+ struct vfio_region_info *info, int *fd);
int (*get_irq_info)(VFIODevice *vdev, struct vfio_irq_info *irq);
int (*set_irqs)(VFIODevice *vdev, struct vfio_irq_set *irqs);
int (*region_read)(VFIODevice *vdev, uint8_t nr, off_t off, uint32_t s=
ize,
--=20
2.34.1