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include/hw/virtio: more comment for VIRTIO_F_BAD_FEATURE 

When debugging a new vhost user you may be surprised to see
VHOST_USER_F_PROTOCOL getting squashed in the maze of
backend_features, acked_features and guest_features. Expand the
description here to help the next poor soul trying to work through
this.

Signed-off-by: Alex Bennée <alex.bennee@linaro.org>

Message-Id: <20220802095010.3330793-6-alex.bennee@linaro.org>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Alex Bennée 2022-08-02 10:49:53 +01:00 committed by Michael S. Tsirkin
parent 02b61f38d3
commit ea5d6ea778
1 changed files with 6 additions and 1 deletions
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7
include/hw/virtio/virtio.h
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@ -24,7 +24,12 @@
#include "qom/object.h"
#include "hw/virtio/vhost.h"
/* A guest should never accept this. It implies negotiation is broken. */
/*
* A guest should never accept this. It implies negotiation is broken
* between the driver frontend and the device. This bit is re-used for
* vhost-user to advertise VHOST_USER_F_PROTOCOL_FEATURES between QEMU
* and a vhost-user backend.
*/
#define VIRTIO_F_BAD_FEATURE 30
#define VIRTIO_LEGACY_FEATURES ((0x1ULL << VIRTIO_F_BAD_FEATURE) | \