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include/hw/virtio/virtio-gpu: Fix virtio-gpu with blob on big endian hosts 

Using "-device virtio-gpu,blob=true" currently does not work on big
endian hosts (like s390x). The guest kernel prints an error message
like:

 [drm:virtio_gpu_dequeue_ctrl_func [virtio_gpu]] *ERROR* response 0x1200 (command 0x10c)

and the display stays black. When running QEMU with "-d guest_errors",
it shows an error message like this:

 virtio_gpu_create_mapping_iov: nr_entries is too big (83886080 > 16384)

which indicates that this value has not been properly byte-swapped.
And indeed, the virtio_gpu_create_blob_bswap() function (that should
swap the fields in the related structure) fails to swap some of the
entries. After correctly swapping all missing values here, too, the
virtio-gpu device is now also working with blob=true on s390x hosts.

Fixes: e0933d91b1 ("virtio-gpu: Add virtio_gpu_resource_create_blob")
Buglink: https://bugzilla.redhat.com/show_bug.cgi?id=2230469
Message-Id: <20230815122007.928049-1-thuth@redhat.com>
Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>
(cherry picked from commit d194362910)
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
Thomas Huth 2023-08-15 14:20:07 +02:00 committed by Michael Tokarev
parent e7ecf6a45f
commit 204ff2b8bb
1 changed files with 3 additions and 0 deletions
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3
include/hw/virtio/virtio-gpu-bswap.h
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@ -63,7 +63,10 @@ virtio_gpu_create_blob_bswap(struct virtio_gpu_resource_create_blob *cblob)
{
virtio_gpu_ctrl_hdr_bswap(&cblob->hdr);
le32_to_cpus(&cblob->resource_id);
le32_to_cpus(&cblob->blob_mem);
le32_to_cpus(&cblob->blob_flags);
le32_to_cpus(&cblob->nr_entries);
le64_to_cpus(&cblob->blob_id);
le64_to_cpus(&cblob->size);
}