[qemu-xen staging] virtio: use virtio accessor to access packed event

[patchbot@xxxxxxx]

commit 08e46e6d92b979743f4f0fb36e587b5e75a0bde6
Author:     Jason Wang <jasowang@xxxxxxxxxx>
AuthorDate: Thu Nov 11 14:38:54 2021 +0800
Commit:     Michael Roth <michael.roth@xxxxxxx>
CommitDate: Tue Dec 14 14:43:25 2021 -0600

    virtio: use virtio accessor to access packed event
    
    We used to access packed descriptor event and off_wrap via
    address_space_{write|read}_cached(). When we hit the cache, memcpy()
    is used which is not atomic which may lead a wrong value to be read or
    wrote.
    
    This patch fixes this by switching to use
    virito_{stw|lduw}_phys_cached() to make sure the access is atomic.
    
    Fixes: 683f7665679c1 ("virtio: event suppression support for packed ring")
    Cc: qemu-stable@xxxxxxxxxx
    Signed-off-by: Jason Wang <jasowang@xxxxxxxxxx>
    Message-Id: <20211111063854.29060-2-jasowang@xxxxxxxxxx>
    Reviewed-by: Philippe Mathieu-Daudé <philmd@xxxxxxxxxx>
    Reviewed-by: Michael S. Tsirkin <mst@xxxxxxxxxx>
    Signed-off-by: Michael S. Tsirkin <mst@xxxxxxxxxx>
    (cherry picked from commit d152cdd6f6fad381e804c8185f0ba938030ccac9)
    Signed-off-by: Michael Roth <michael.roth@xxxxxxx>
---
 hw/virtio/virtio.c | 13 ++++---------
 1 file changed, 4 insertions(+), 9 deletions(-)

diff --git a/hw/virtio/virtio.c b/hw/virtio/virtio.c
index 2dbccb6b3f..c9567f09ed 100644
--- a/hw/virtio/virtio.c
+++ b/hw/virtio/virtio.c
@@ -249,13 +249,10 @@ static void vring_packed_event_read(VirtIODevice *vdev,
     hwaddr off_off = offsetof(VRingPackedDescEvent, off_wrap);
     hwaddr off_flags = offsetof(VRingPackedDescEvent, flags);
 
-    address_space_read_cached(cache, off_flags, &e->flags,
-                              sizeof(e->flags));
+    e->flags = virtio_lduw_phys_cached(vdev, cache, off_flags);
     /* Make sure flags is seen before off_wrap */
     smp_rmb();
-    address_space_read_cached(cache, off_off, &e->off_wrap,
-                              sizeof(e->off_wrap));
-    virtio_tswap16s(vdev, &e->off_wrap);
+    e->off_wrap = virtio_lduw_phys_cached(vdev, cache, off_off);
     virtio_tswap16s(vdev, &e->flags);
 }
 
@@ -265,8 +262,7 @@ static void vring_packed_off_wrap_write(VirtIODevice *vdev,
 {
     hwaddr off = offsetof(VRingPackedDescEvent, off_wrap);
 
-    virtio_tswap16s(vdev, &off_wrap);
-    address_space_write_cached(cache, off, &off_wrap, sizeof(off_wrap));
+    virtio_stw_phys_cached(vdev, cache, off, off_wrap);
     address_space_cache_invalidate(cache, off, sizeof(off_wrap));
 }
 
@@ -275,8 +271,7 @@ static void vring_packed_flags_write(VirtIODevice *vdev,
 {
     hwaddr off = offsetof(VRingPackedDescEvent, flags);
 
-    virtio_tswap16s(vdev, &flags);
-    address_space_write_cached(cache, off, &flags, sizeof(flags));
+    virtio_stw_phys_cached(vdev, cache, off, flags);
     address_space_cache_invalidate(cache, off, sizeof(flags));
 }
 
--
generated by git-patchbot for /home/xen/git/qemu-xen.git#staging