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vfio/migration: Add P2P support for VFIO migration

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VFIO migration uAPI defines an optional intermediate P2P quiescent
state. While in the P2P quiescent state, P2P DMA transactions cannot be
initiated by the device, but the device can respond to incoming ones.
Additionally, all outstanding P2P transactions are guaranteed to have
been completed by the time the device enters this state.

The purpose of this state is to support migration of multiple devices
that might do P2P transactions between themselves.

Add support for P2P migration by transitioning all the devices to the
P2P quiescent state before stopping or starting the devices. Use the new
VMChangeStateHandler prepare_cb to achieve that behavior.

This will allow migration of multiple VFIO devices if all of them
support P2P migration.

Signed-off-by: Avihai Horon <avihaih@nvidia.com>
Tested-by: YangHang Liu <yanghliu@redhat.com>
Reviewed-by: Cédric Le Goater <clg@redhat.com>
Signed-off-by: Cédric Le Goater <clg@redhat.com>
This commit is contained in:
Avihai Horon 2023-08-02 11:14:48 +03:00 • committed by Cédric Le Goater
parent 3d4d0f0e06
commit 94f775e428
4 changed files with 105 additions and 41 deletions
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6
hw/vfio/common.c
View file

@ -441,14 +441,16 @@ bool vfio_device_state_is_running(VFIODevice *vbasedev)
{
VFIOMigration *migration = vbasedev->migration;
return migration->device_state == VFIO_DEVICE_STATE_RUNNING;
return migration->device_state == VFIO_DEVICE_STATE_RUNNING ||
migration->device_state == VFIO_DEVICE_STATE_RUNNING_P2P;
}
bool vfio_device_state_is_precopy(VFIODevice *vbasedev)
{
VFIOMigration *migration = vbasedev->migration;
return migration->device_state == VFIO_DEVICE_STATE_PRE_COPY;
return migration->device_state == VFIO_DEVICE_STATE_PRE_COPY ||
migration->device_state == VFIO_DEVICE_STATE_PRE_COPY_P2P;
}
static bool vfio_devices_all_dirty_tracking(VFIOContainer *container)