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3 commits

Author SHA1 Message Date
Andrew Scull
fbef3f53d4 virtio_ring: Check used descriptors are chain heads
When the device returns used buffers, it should refer to the descriptor
that is the head of the descriptor chain for that buffer. Confirm this
to be the case by tracking the head of descriptor chains that have been
made available to the device.

Signed-off-by: Andrew Scull <ascull@google.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
2022-06-08 09:24:03 -04:00
Andrew Scull
10a1453636 virtio_ring: Maintain a shadow copy of descriptors
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>
2022-06-08 09:24:03 -04:00
Tuomas Tynkkynen
c011641ec4 virtio: Add codes for virtual queue/ring management
This adds support for managing virtual queue/ring, the channel
for high performance I/O between host and guest.

Signed-off-by: Tuomas Tynkkynen <tuomas.tynkkynen@iki.fi>
Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
2018-11-14 09:16:27 -08:00