This new command shows internal status of a VirtQueue. (vrings and indexes).
Signed-off-by: Laurent Vivier <lviv...@redhat.com> --- hw/virtio/virtio-stub.c | 6 +++ hw/virtio/virtio.c | 35 +++++++++++++++ qapi/virtio.json | 98 +++++++++++++++++++++++++++++++++++++++++ 3 files changed, 139 insertions(+) diff --git a/hw/virtio/virtio-stub.c b/hw/virtio/virtio-stub.c index ddb592f72eee..3c1bf172acf6 100644 --- a/hw/virtio/virtio-stub.c +++ b/hw/virtio/virtio-stub.c @@ -17,3 +17,9 @@ VirtioStatus *qmp_x_debug_virtio_status(const char* path, Error **errp) { return qmp_virtio_unsupported(errp); } + +VirtQueueStatus *qmp_x_debug_virtio_queue_status(const char *path, + uint16_t queue, Error **errp) +{ + return qmp_virtio_unsupported(errp); +} diff --git a/hw/virtio/virtio.c b/hw/virtio/virtio.c index 59bf6ef651a6..57552bf05014 100644 --- a/hw/virtio/virtio.c +++ b/hw/virtio/virtio.c @@ -3877,6 +3877,41 @@ static VirtIODevice *virtio_device_find(const char *path) return NULL; } +VirtQueueStatus *qmp_x_debug_virtio_queue_status(const char *path, + uint16_t queue, Error **errp) +{ + VirtIODevice *vdev; + VirtQueueStatus *status; + + vdev = virtio_device_find(path); + if (vdev == NULL) { + error_setg(errp, "Path %s is not a VirtIO device", path); + return NULL; + } + + if (queue >= VIRTIO_QUEUE_MAX || !virtio_queue_get_num(vdev, queue)) { + error_setg(errp, "Invalid virtqueue number %d", queue); + return NULL; + } + + status = g_new0(VirtQueueStatus, 1); + status->queue_index = vdev->vq[queue].queue_index; + status->inuse = vdev->vq[queue].inuse; + status->vring_num = vdev->vq[queue].vring.num; + status->vring_num_default = vdev->vq[queue].vring.num_default; + status->vring_align = vdev->vq[queue].vring.align; + status->vring_desc = vdev->vq[queue].vring.desc; + status->vring_avail = vdev->vq[queue].vring.avail; + status->vring_used = vdev->vq[queue].vring.used; + status->last_avail_idx = vdev->vq[queue].last_avail_idx; + status->shadow_avail_idx = vdev->vq[queue].shadow_avail_idx; + status->used_idx = vdev->vq[queue].used_idx; + status->signalled_used = vdev->vq[queue].signalled_used; + status->signalled_used_valid = vdev->vq[queue].signalled_used_valid; + + return status; +} + #define CONVERT_FEATURES(type, map) \ ({ \ type *list = NULL; \ diff --git a/qapi/virtio.json b/qapi/virtio.json index 69dd107d0c9b..43c234a9fc69 100644 --- a/qapi/virtio.json +++ b/qapi/virtio.json @@ -308,3 +308,101 @@ 'data': { 'path': 'str' }, 'returns': 'VirtioStatus' } + +## +# @VirtQueueStatus: +# +# Status of a VirtQueue +# +# @queue-index: VirtQueue queue_index +# +# @inuse: VirtQueue inuse +# +# @vring-num: VirtQueue vring.num +# +# @vring-num-default: VirtQueue vring.num_default +# +# @vring-align: VirtQueue vring.align +# +# @vring-desc: VirtQueue vring.desc +# +# @vring-avail: VirtQueue vring.avail +# +# @vring-used: VirtQueue vring.used +# +# @last-avail-idx: VirtQueue last_avail_idx +# +# @shadow-avail-idx: VirtQueue shadow_avail_idx +# +# @used-idx: VirtQueue used_idx +# +# @signalled-used: VirtQueue signalled_used +# +# @signalled-used-valid: VirtQueue signalled_used_valid +# +# Since: 5.1 +# +## + +{ 'struct': 'VirtQueueStatus', + 'data': { + 'queue-index': 'uint16', + 'inuse': 'uint32', + 'vring-num': 'int', + 'vring-num-default': 'int', + 'vring-align': 'int', + 'vring-desc': 'uint64', + 'vring-avail': 'uint64', + 'vring-used': 'uint64', + 'last-avail-idx': 'uint16', + 'shadow-avail-idx': 'uint16', + 'used-idx': 'uint16', + 'signalled-used': 'uint16', + 'signalled-used-valid': 'uint16' + } +} + +## +# @x-debug-virtio-queue-status: +# +# Return the status of a given VirtQueue +# +# @path: QOBject path of the VirtIODevice +# +# @queue: queue number to examine +# +# Returns: Status of the VirtQueue +# +# Since: 5.1 +# +# Example: +# +# -> { "execute": "x-debug-virtio-queue-status", +# "arguments": { +# "path": "/machine/peripheral-anon/device[3]/virtio-backend", +# "queue": 0 +# } +# } +# <- { "return": { +# "signalled-used": 373, +# "inuse": 0, +# "vring-desc": 864411648, +# "vring-num-default": 256, +# "signalled-used-valid": 1, +# "vring-avail": 864415744, +# "last-avail-idx": 373, +# "queue-index": 0, +# "vring-used": 864416320, +# "shadow-avail-idx": 619, +# "used-idx": 373, +# "vring-num": 256, +# "vring-align": 4096 +# } +# } +# +## + +{ 'command': 'x-debug-virtio-queue-status', + 'data': { 'path': 'str', 'queue': 'uint16' }, + 'returns': 'VirtQueueStatus' +} -- 2.26.2