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vfio/iommufd: change process

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Finish CPR by change the owning process of the iommufd device in
post load.

Signed-off-by: Steve Sistare <steven.sistare@oracle.com>
Reviewed-by: Zhenzhong Duan <zhenzhong.duan@intel.com>
Link: https://lore.kernel.org/qemu-devel/1751493538-202042-19-git-send-email-steven.sistare@oracle.com
[ clg: Fixed missing "qemu/error-report.h" include ]
Signed-off-by: Cédric Le Goater <clg@redhat.com>
This commit is contained in:
Steve Sistare 2025-07-02 14:58:55 -07:00 • committed by Cédric Le Goater
parent 010643eeb1
commit 5c066c4be2
1 changed files with 31 additions and 0 deletions
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31
hw/vfio/cpr-iommufd.c
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@ -5,6 +5,7 @@
*/
#include "qemu/osdep.h"
#include "qemu/error-report.h"
#include "qapi/error.h"
#include "hw/vfio/vfio-cpr.h"
#include "hw/vfio/vfio-device.h"
@ -112,10 +113,40 @@ static bool vfio_cpr_supported(IOMMUFDBackend *be, Error **errp)
return true;
}
static int iommufd_cpr_pre_save(void *opaque)
{
IOMMUFDBackend *be = opaque;
/*
* The process has not changed yet, but proactively try the ioctl,
* and it will fail if any DMA mappings are not supported.
*/
if (!iommufd_change_process_capable(be)) {
error_report("some memory regions do not support "
"IOMMU_IOAS_CHANGE_PROCESS");
return -1;
}
return 0;
}
static int iommufd_cpr_post_load(void *opaque, int version_id)
{
IOMMUFDBackend *be = opaque;
Error *local_err = NULL;
if (!iommufd_change_process(be, &local_err)) {
error_report_err(local_err);
return -1;
}
return 0;
}
static const VMStateDescription iommufd_cpr_vmstate = {
.name = "iommufd",
.version_id = 0,
.minimum_version_id = 0,
.pre_save = iommufd_cpr_pre_save,
.post_load = iommufd_cpr_post_load,
.needed = cpr_incoming_needed,
.fields = (VMStateField[]) {
VMSTATE_END_OF_LIST()