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vfio/container: mdev cpr blocker

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During CPR, after VFIO_DMA_UNMAP_FLAG_VADDR, the vaddr is temporarily
invalid, so mediated devices cannot be supported.  Add a blocker for them.
This restriction will not apply to iommufd containers when CPR is added
for them in a future patch.

Signed-off-by: Steve Sistare <steven.sistare@oracle.com>
Reviewed-by: Cédric Le Goater <clg@redhat.com>
Link: https://lore.kernel.org/qemu-devel/1749569991-25171-8-git-send-email-steven.sistare@oracle.com
[ clg: Fixed context change in VFIODevice ]
Signed-off-by: Cédric Le Goater <clg@redhat.com>
This commit is contained in:
Steve Sistare 2025-06-10 08:39:20 -07:00 • committed by Cédric Le Goater
parent 7e9f214113
commit dac0dd68d9
3 changed files with 13 additions and 0 deletions
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8
hw/vfio/container.c
View file

@ -987,6 +987,13 @@ static bool vfio_legacy_attach_device(const char *name, VFIODevice *vbasedev,
goto device_put_exit;
}
if (vbasedev->mdev) {
error_setg(&vbasedev->cpr.mdev_blocker,
"CPR does not support vfio mdev %s", vbasedev->name);
migrate_add_blocker_modes(&vbasedev->cpr.mdev_blocker, &error_fatal,
MIG_MODE_CPR_TRANSFER, -1);
}
return true;
device_put_exit:
@ -1004,6 +1011,7 @@ static void vfio_legacy_detach_device(VFIODevice *vbasedev)
vfio_device_unprepare(vbasedev);
migrate_del_blocker(&vbasedev->cpr.mdev_blocker);
object_unref(vbasedev->hiod);
vfio_device_put(vbasedev);
vfio_group_put(group);

3
include/hw/vfio/vfio-cpr.h
View file

@ -22,6 +22,9 @@ typedef struct VFIOContainerCPR {
void *vaddr, bool readonly, MemoryRegion *mr);
} VFIOContainerCPR;
typedef struct VFIODeviceCPR {
Error *mdev_blocker;
} VFIODeviceCPR;
bool vfio_legacy_cpr_register_container(struct VFIOContainer *container,
Error **errp);

2
include/hw/vfio/vfio-device.h
View file

@ -28,6 +28,7 @@
#endif
#include "system/system.h"
#include "hw/vfio/vfio-container-base.h"
#include "hw/vfio/vfio-cpr.h"
#include "system/host_iommu_device.h"
#include "system/iommufd.h"
@ -86,6 +87,7 @@ typedef struct VFIODevice {
QLIST_ENTRY(VFIODevice) hwpt_next;
struct vfio_region_info **reginfo;
int *region_fds;
VFIODeviceCPR cpr;
} VFIODevice;
struct VFIODeviceOps {