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vfio: Add function to start and stop dirty pages tracking 

Call VFIO_IOMMU_DIRTY_PAGES ioctl to start and stop dirty pages tracking
for VFIO devices.

Signed-off-by: Kirti Wankhede <kwankhede@nvidia.com>
Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
This commit is contained in:
Kirti Wankhede 2020-10-26 15:06:22 +05:30 committed by Alex Williamson
parent 87ea529c50
commit e663f51683
1 changed files with 36 additions and 0 deletions
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36
hw/vfio/migration.c
View File

@ -11,6 +11,7 @@
#include "qemu/main-loop.h"
#include "qemu/cutils.h"
#include <linux/vfio.h>
#include <sys/ioctl.h>
#include "sysemu/runstate.h"
#include "hw/vfio/vfio-common.h"
@ -391,10 +392,40 @@ static int vfio_load_device_config_state(QEMUFile *f, void *opaque)
return qemu_file_get_error(f);
}
static int vfio_set_dirty_page_tracking(VFIODevice *vbasedev, bool start)
{
int ret;
VFIOMigration *migration = vbasedev->migration;
VFIOContainer *container = vbasedev->group->container;
struct vfio_iommu_type1_dirty_bitmap dirty = {
.argsz = sizeof(dirty),
};
if (start) {
if (migration->device_state & VFIO_DEVICE_STATE_SAVING) {
dirty.flags = VFIO_IOMMU_DIRTY_PAGES_FLAG_START;
} else {
return -EINVAL;
}
} else {
dirty.flags = VFIO_IOMMU_DIRTY_PAGES_FLAG_STOP;
}
ret = ioctl(container->fd, VFIO_IOMMU_DIRTY_PAGES, &dirty);
if (ret) {
error_report("Failed to set dirty tracking flag 0x%x errno: %d",
dirty.flags, errno);
return -errno;
}
return ret;
}
static void vfio_migration_cleanup(VFIODevice *vbasedev)
{
VFIOMigration *migration = vbasedev->migration;
vfio_set_dirty_page_tracking(vbasedev, false);
if (migration->region.mmaps) {
vfio_region_unmap(&migration->region);
}
@ -435,6 +466,11 @@ static int vfio_save_setup(QEMUFile *f, void *opaque)
return ret;
}
ret = vfio_set_dirty_page_tracking(vbasedev, true);
if (ret) {
return ret;
}
qemu_put_be64(f, VFIO_MIG_FLAG_END_OF_STATE);
ret = qemu_file_get_error(f);