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vfio: allow cpr-reboot migration if suspended

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Allow cpr-reboot for vfio if the guest is in the suspended runstate.  The
guest drivers' suspend methods flush outstanding requests and re-initialize
the devices, and thus there is no device state to save and restore.  The
user is responsible for suspending the guest before initiating cpr, such as
by issuing guest-suspend-ram to the qemu guest agent.

Relax the vfio blocker so it does not apply to cpr, and add a notifier that
verifies the guest is suspended.

Signed-off-by: Steve Sistare <steven.sistare@oracle.com>
Reviewed-by: Cédric Le Goater <clg@redhat.com>
This commit is contained in:
Steve Sistare 2024-02-22 09:28:38 -08:00 • committed by Cédric Le Goater
parent d9fa4223b3
commit 0cb51c183a
4 changed files with 23 additions and 2 deletions
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1
include/hw/vfio/vfio-container-base.h
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@ -49,6 +49,7 @@ typedef struct VFIOContainerBase {
QLIST_ENTRY(VFIOContainerBase) next;
QLIST_HEAD(, VFIODevice) device_list;
GList *iova_ranges;
NotifierWithReturn cpr_reboot_notifier;
} VFIOContainerBase;
typedef struct VFIOGuestIOMMU {