diff mbox series

[PULL,2/2] vfio: Change default dirty pages tracking behavior during migration

Message ID 160615422468.26810.11297474908661737858.stgit@gimli.home
State New
Headers show
Series [PULL,1/2] vfio: Make migration support experimental | expand

Commit Message

Alex Williamson Nov. 23, 2020, 5:57 p.m. UTC 
From: Kirti Wankhede <kwankhede@nvidia.com>

By default dirty pages tracking is enabled during iterative phase
(pre-copy phase).
Added per device opt-out option 'x-pre-copy-dirty-page-tracking' to
disable dirty pages tracking during iterative phase. If the option
'x-pre-copy-dirty-page-tracking=off' is set for any VFIO device, dirty
pages tracking during iterative phase will be disabled.

Signed-off-by: Kirti Wankhede <kwankhede@nvidia.com>
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
---
 hw/vfio/common.c              |   11 +++++++----
 hw/vfio/pci.c                 |    3 +++
 include/hw/vfio/vfio-common.h |    1 +
 3 files changed, 11 insertions(+), 4 deletions(-)
diff mbox series

Patch

diff --git a/hw/vfio/common.c b/hw/vfio/common.c
index c1fdbf17f2e6..6ff1daa763f8 100644
--- a/hw/vfio/common.c
+++ b/hw/vfio/common.c
@@ -311,7 +311,7 @@  bool vfio_mig_active(void)
     return true;
 }
 
-static bool vfio_devices_all_stopped_and_saving(VFIOContainer *container)
+static bool vfio_devices_all_saving(VFIOContainer *container)
 {
     VFIOGroup *group;
     VFIODevice *vbasedev;
@@ -329,8 +329,11 @@  static bool vfio_devices_all_stopped_and_saving(VFIOContainer *container)
                 return false;
             }
 
-            if ((migration->device_state & VFIO_DEVICE_STATE_SAVING) &&
-                !(migration->device_state & VFIO_DEVICE_STATE_RUNNING)) {
+            if (migration->device_state & VFIO_DEVICE_STATE_SAVING) {
+                if ((vbasedev->pre_copy_dirty_page_tracking == ON_OFF_AUTO_OFF)
+                    && (migration->device_state & VFIO_DEVICE_STATE_RUNNING)) {
+                        return false;
+                }
                 continue;
             } else {
                 return false;
@@ -1125,7 +1128,7 @@  static void vfio_listerner_log_sync(MemoryListener *listener,
         return;
     }
 
-    if (vfio_devices_all_stopped_and_saving(container)) {
+    if (vfio_devices_all_saving(container)) {
         vfio_sync_dirty_bitmap(container, section);
     }
 }
diff --git a/hw/vfio/pci.c b/hw/vfio/pci.c
index 1349b900e513..51dc37369504 100644
--- a/hw/vfio/pci.c
+++ b/hw/vfio/pci.c
@@ -3182,6 +3182,9 @@  static void vfio_instance_init(Object *obj)
 static Property vfio_pci_dev_properties[] = {
     DEFINE_PROP_PCI_HOST_DEVADDR("host", VFIOPCIDevice, host),
     DEFINE_PROP_STRING("sysfsdev", VFIOPCIDevice, vbasedev.sysfsdev),
+    DEFINE_PROP_ON_OFF_AUTO("x-pre-copy-dirty-page-tracking", VFIOPCIDevice,
+                            vbasedev.pre_copy_dirty_page_tracking,
+                            ON_OFF_AUTO_ON),
     DEFINE_PROP_ON_OFF_AUTO("display", VFIOPCIDevice,
                             display, ON_OFF_AUTO_OFF),
     DEFINE_PROP_UINT32("xres", VFIOPCIDevice, display_xres, 0),
diff --git a/include/hw/vfio/vfio-common.h b/include/hw/vfio/vfio-common.h
index 2119872c8af1..6141162d7aea 100644
--- a/include/hw/vfio/vfio-common.h
+++ b/include/hw/vfio/vfio-common.h
@@ -130,6 +130,7 @@  typedef struct VFIODevice {
     unsigned int flags;
     VFIOMigration *migration;
     Error *migration_blocker;
+    OnOffAuto pre_copy_dirty_page_tracking;
 } VFIODevice;
 
 struct VFIODeviceOps {