virtio-mmio: add support for transport version 3

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Virtio MMIO transport version 3 allows device reset to complete
asynchronously. Unlike version 2, where writing zero to Status must
complete the reset before the write returns, version 3 requires the
driver to poll Status until it reads back zero before considering reset
complete.

Update virtio-mmio accordingly: accept transport version 3 and, during
reset, wait for Status to become zero. Keep the polling loop unbounded,
consistent with virtio-pci, since the reset callback does not return an
error code.

Signed-off-by: Peter Hilber <peter.hilber@oss.qualcomm.com>
Link: bb1dd2e1fe
Message-ID: <20260605142921.2824-1-peter.hilber@oss.qualcomm.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

...

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Peter Hilber 2026-06-05 16:29:21 +02:00 • committed by Michael S. Tsirkin

parent 8d3ae59288

commit fa8833c085

1 changed files with 10 additions and 3 deletions

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drivers/virtio/virtio_mmio.c

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