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hw/virtio/virtio-nsm: Respond with correct length

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When we return a response packet from NSM, we need to indicate its
length according to the content of the response. Prior to this patch, we
returned the length of the source buffer, which may confuse guest code
that relies on the response size.

Fix it by returning the response payload size instead.

Fixes: bb154e3e0c ("device/virtio-nsm: Support for Nitro Secure Module device")
Reported-by: Vikrant Garg <vikrant1garg@gmail.com>
Signed-off-by: Alexander Graf <graf@amazon.com>
Message-Id: <20250213114541.67515-1-graf@amazon.com>
Reviewed-by: Dorjoy Chowdhury <dorjoychy111@gmail.com>
Fixes: bb154e3e0c (&quot;device/virtio-nsm: Support for Nitro Secure Module device&quot;)<br>
Reported-by: Vikrant Garg <vikrant1garg@gmail.com>
Signed-off-by: Alexander Graf <graf@amazon.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Tested-by: Vikrant Garg <vikrant1garg@gmail.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Alexander Graf 2025-02-13 11:45:41 +00:00 • committed by Michael S. Tsirkin
parent 50e9754149
commit 131fe64e63
1 changed files with 1 additions and 1 deletions
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2
hw/virtio/virtio-nsm.c
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@ -1596,7 +1596,7 @@ static void handle_input(VirtIODevice *vdev, VirtQueue *vq)
g_free(req.iov_base); g_free(req.iov_base);
g_free(res.iov_base); g_free(res.iov_base);
virtqueue_push(vq, out_elem, 0); virtqueue_push(vq, out_elem, 0);
virtqueue_push(vq, in_elem, in_elem->in_sg->iov_len); virtqueue_push(vq, in_elem, sz);
virtio_notify(vdev, vq); virtio_notify(vdev, vq);
return; return;