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vfio/container: discard old DMA vaddr

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In the container pre_save handler, discard the virtual addresses in DMA
mappings with VFIO_DMA_UNMAP_FLAG_VADDR, because guest RAM will be
remapped at a different VA after in new QEMU.  DMA to already-mapped
pages continues.

Signed-off-by: Steve Sistare <steven.sistare@oracle.com>
Reviewed-by: Cédric Le Goater <clg@redhat.com>
Link: https://lore.kernel.org/qemu-devel/1749569991-25171-6-git-send-email-steven.sistare@oracle.com
Signed-off-by: Cédric Le Goater <clg@redhat.com>
This commit is contained in:
Steve Sistare 2025-06-10 08:39:18 -07:00 • committed by Cédric Le Goater
parent c29a65ed68
commit 1faadd9630
1 changed files with 29 additions and 0 deletions
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29
hw/vfio/cpr-legacy.c
View file

@ -15,6 +15,22 @@
#include "migration/vmstate.h"
#include "qapi/error.h"
static bool vfio_dma_unmap_vaddr_all(VFIOContainer *container, Error **errp)
{
struct vfio_iommu_type1_dma_unmap unmap = {
.argsz = sizeof(unmap),
.flags = VFIO_DMA_UNMAP_FLAG_VADDR | VFIO_DMA_UNMAP_FLAG_ALL,
.iova = 0,
.size = 0,
};
if (ioctl(container->fd, VFIO_IOMMU_UNMAP_DMA, &unmap)) {
error_setg_errno(errp, errno, "vfio_dma_unmap_vaddr_all");
return false;
}
return true;
}
static bool vfio_cpr_supported(VFIOContainer *container, Error **errp)
{
if (!ioctl(container->fd, VFIO_CHECK_EXTENSION, VFIO_UPDATE_VADDR)) {
@ -30,10 +46,23 @@ static bool vfio_cpr_supported(VFIOContainer *container, Error **errp)
}
}
static int vfio_container_pre_save(void *opaque)
{
VFIOContainer *container = opaque;
Error *local_err = NULL;
if (!vfio_dma_unmap_vaddr_all(container, &local_err)) {
error_report_err(local_err);
return -1;
}
return 0;
}
static const VMStateDescription vfio_container_vmstate = {
.name = "vfio-container",
.version_id = 0,
.minimum_version_id = 0,
.pre_save = vfio_container_pre_save,
.needed = cpr_incoming_needed,
.fields = (VMStateField[]) {
VMSTATE_END_OF_LIST()