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vdpa: Export vhost_vdpa_dma_map and unmap calls 

Shadow CVQ will copy buffers on qemu VA, so we avoid TOCTOU attacks from
the guest that could set a different state in qemu device model and vdpa
device.

To do so, it needs to be able to map these new buffers to the device.

Signed-off-by: Eugenio Pérez <eperezma@redhat.com>
Acked-by: Jason Wang <jasowang@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
This commit is contained in:
Eugenio Pérez 2022-07-20 08:59:40 +02:00 committed by Jason Wang
parent e966c0b781
commit 463ba1e3b8
2 changed files with 7 additions and 4 deletions
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7
hw/virtio/vhost-vdpa.c
View File

@ -71,8 +71,8 @@ static bool vhost_vdpa_listener_skipped_section(MemoryRegionSection *section,
return false; return false;
} }
static int vhost_vdpa_dma_map(struct vhost_vdpa *v, hwaddr iova, hwaddr size, int vhost_vdpa_dma_map(struct vhost_vdpa *v, hwaddr iova, hwaddr size,
void *vaddr, bool readonly) void *vaddr, bool readonly)
{ {
struct vhost_msg_v2 msg = {}; struct vhost_msg_v2 msg = {};
int fd = v->device_fd; int fd = v->device_fd;
@ -97,8 +97,7 @@ static int vhost_vdpa_dma_map(struct vhost_vdpa *v, hwaddr iova, hwaddr size,
return ret; return ret;
} }
static int vhost_vdpa_dma_unmap(struct vhost_vdpa *v, hwaddr iova, int vhost_vdpa_dma_unmap(struct vhost_vdpa *v, hwaddr iova, hwaddr size)
hwaddr size)
{ {
struct vhost_msg_v2 msg = {}; struct vhost_msg_v2 msg = {};
int fd = v->device_fd; int fd = v->device_fd;

4
include/hw/virtio/vhost-vdpa.h
View File

@ -39,4 +39,8 @@ typedef struct vhost_vdpa {
VhostVDPAHostNotifier notifier[VIRTIO_QUEUE_MAX]; VhostVDPAHostNotifier notifier[VIRTIO_QUEUE_MAX];
} VhostVDPA; } VhostVDPA;
int vhost_vdpa_dma_map(struct vhost_vdpa *v, hwaddr iova, hwaddr size,
void *vaddr, bool readonly);
int vhost_vdpa_dma_unmap(struct vhost_vdpa *v, hwaddr iova, hwaddr size);
#endif #endif