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virtio_ring: Maintain a shadow copy of descriptors

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The shared descriptors should only be written by the guest driver,
however, the device is still able to overwrite and corrupt them.
Maintain a private shadow copy of the descriptors for the driver to
use for state tracking, removing the need to read from the shared
descriptors.

Signed-off-by: Andrew Scull <ascull@google.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Andrew Scull
2022-05-16 10:41:31 +00:00
committed by Tom Rini
parent b0952977c9
commit 10a1453636
2 changed files with 43 additions and 16 deletions
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10
include/virtio_ring.h
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@@ -55,6 +55,14 @@ struct vring_desc {
__virtio16 next;
};
/* Shadow of struct vring_desc in guest byte order. */
struct vring_desc_shadow {
u64 addr;
u32 len;
u16 flags;
u16 next;
};
struct vring_avail {
__virtio16 flags;
__virtio16 idx;
@@ -89,6 +97,7 @@ struct vring {
* @index: the zero-based ordinal number for this queue
* @num_free: number of elements we expect to be able to fit
* @vring: actual memory layout for this queue
* @vring_desc_shadow: guest-only copy of descriptors
* @event: host publishes avail event idx
* @free_head: head of free buffer list
* @num_added: number we've added since last sync
@@ -102,6 +111,7 @@ struct virtqueue {
unsigned int index;
unsigned int num_free;
struct vring vring;
struct vring_desc_shadow *vring_desc_shadow;
bool event;
unsigned int free_head;
unsigned int num_added;