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vfio: Change default dirty pages tracking behavior during migration 

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>
master
Kirti Wankhede 2020-11-23 19:53:19 +05:30 committed by Alex Williamson
parent cf254988a5
commit bb0990d174
3 changed files with 11 additions and 4 deletions
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11
hw/vfio/common.c
View File

@ -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);
}
}

3
hw/vfio/pci.c
View File

@ -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),

1
include/hw/vfio/vfio-common.h
View File

@ -130,6 +130,7 @@ typedef struct VFIODevice {
unsigned int flags;
VFIOMigration *migration;
Error *migration_blocker;
OnOffAuto pre_copy_dirty_page_tracking;
} VFIODevice;
struct VFIODeviceOps {