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authorKirti Wankhede <kwankhede@nvidia.com>2020-10-26 15:06:22 +0530
committerAlex Williamson <alex.williamson@redhat.com>2020-11-01 12:30:51 -0700
commite663f516830c61f1dcafd2dda810126c14327b15 (patch)
treef636f8a58b629ea9cc151ce74353bc2830d6fbbc
parent87ea529c5020124440cd892a038dffe6057fd613 (diff)
downloadqemu-arm-e663f516830c61f1dcafd2dda810126c14327b15.tar.gz
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>
-rw-r--r--hw/vfio/migration.c36
1 files changed, 36 insertions, 0 deletions
diff --git a/hw/vfio/migration.c b/hw/vfio/migration.c
index 39503b49e3..a248effb37 100644
--- a/hw/vfio/migration.c
+++ b/hw/vfio/migration.c
@@ -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);