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Tsirkin" , Eric Blake , Markus Armbruster , Thomas Huth , Laurent Vivier , Paolo Bonzini , Hyman Huang Subject: [RFC 1/2] qapi/virtio: introduce the "show-bits" argument for x-query-virtio-status Date: Sun, 12 Nov 2023 21:03:19 +0800 Message-Id: <2f146005c8573814528f4ffb5a0393eb73b154e3.1699793550.git.yong.huang@smartx.com> X-Mailer: git-send-email 2.39.1 In-Reply-To: References: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: none client-ip=2607:f8b0:4864:20::42e; envelope-from=yong.huang@smartx.com; helo=mail-pf1-x42e.google.com X-Spam_score_int: -18 X-Spam_score: -1.9 X-Spam_bar: - X-Spam_report: (-1.9 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_NONE=0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @smartx-com.20230601.gappssmtp.com) X-ZM-MESSAGEID: 1699794403471100011 Content-Type: text/plain; charset="utf-8" This patch allows to display feature and status bits in virtio-status. An optional argument is introduced: show-bits. For example: {"execute": "x-query-virtio-status", "arguments": {"path": "/machine/peripheral-anon/device[1]/virtio-backend", "show-bits": true} Features and status bits could be helpful for applications to compare directly. For instance, when an upper application aims to ensure the virtio negotiation correctness between guest, QEMU, and OVS-DPDK, it use the "ovs-vsctl list interface" command to retrieve interface features (in number format) and the QMP command x-query-virtio-status to retrieve vhost-user net device features. If "show-bits" is added, the application can compare the two features directly; No need to encoding the features returned by the QMP command. This patch also serves as a preparation for the next one, which implements a vhost-user test case about acked features of vhost-user protocol. Note that since the matching HMP command is typically used for human, leave it unchanged. Signed-off-by: Hyman Huang --- hw/virtio/virtio-hmp-cmds.c | 2 +- hw/virtio/virtio-qmp.c | 21 +++++++++++++++- qapi/virtio.json | 49 ++++++++++++++++++++++++++++++++++--- 3 files changed, 67 insertions(+), 5 deletions(-) diff --git a/hw/virtio/virtio-hmp-cmds.c b/hw/virtio/virtio-hmp-cmds.c index 477c97dea2..3774f3d4bf 100644 --- a/hw/virtio/virtio-hmp-cmds.c +++ b/hw/virtio/virtio-hmp-cmds.c @@ -108,7 +108,7 @@ void hmp_virtio_status(Monitor *mon, const QDict *qdict) { Error *err =3D NULL; const char *path =3D qdict_get_try_str(qdict, "path"); - VirtioStatus *s =3D qmp_x_query_virtio_status(path, &err); + VirtioStatus *s =3D qmp_x_query_virtio_status(path, false, false, &err= ); =20 if (err !=3D NULL) { hmp_handle_error(mon, err); diff --git a/hw/virtio/virtio-qmp.c b/hw/virtio/virtio-qmp.c index 1dd96ed20f..2e92bf28ac 100644 --- a/hw/virtio/virtio-qmp.c +++ b/hw/virtio/virtio-qmp.c @@ -718,10 +718,15 @@ VirtIODevice *qmp_find_virtio_device(const char *path) return VIRTIO_DEVICE(dev); } =20 -VirtioStatus *qmp_x_query_virtio_status(const char *path, Error **errp) +VirtioStatus *qmp_x_query_virtio_status(const char *path, + bool has_show_bits, + bool show_bits, + Error **errp) { VirtIODevice *vdev; VirtioStatus *status; + bool display_bits =3D + has_show_bits ? show_bits : false; =20 vdev =3D qmp_find_virtio_device(path); if (vdev =3D=3D NULL) { @@ -733,6 +738,11 @@ VirtioStatus *qmp_x_query_virtio_status(const char *pa= th, Error **errp) status->name =3D g_strdup(vdev->name); status->device_id =3D vdev->device_id; status->vhost_started =3D vdev->vhost_started; + if (display_bits) { + status->guest_features_bits =3D vdev->guest_features; + status->host_features_bits =3D vdev->host_features; + status->backend_features_bits =3D vdev->backend_features; + } status->guest_features =3D qmp_decode_features(vdev->device_id, vdev->guest_features); status->host_features =3D qmp_decode_features(vdev->device_id, @@ -753,6 +763,9 @@ VirtioStatus *qmp_x_query_virtio_status(const char *pat= h, Error **errp) } =20 status->num_vqs =3D virtio_get_num_queues(vdev); + if (display_bits) { + status->status_bits =3D vdev->status; + } status->status =3D qmp_decode_status(vdev->status); status->isr =3D vdev->isr; status->queue_sel =3D vdev->queue_sel; @@ -775,6 +788,12 @@ VirtioStatus *qmp_x_query_virtio_status(const char *pa= th, Error **errp) status->vhost_dev->n_tmp_sections =3D hdev->n_tmp_sections; status->vhost_dev->nvqs =3D hdev->nvqs; status->vhost_dev->vq_index =3D hdev->vq_index; + if (display_bits) { + status->vhost_dev->features_bits =3D hdev->features; + status->vhost_dev->acked_features_bits =3D hdev->acked_feature= s; + status->vhost_dev->backend_features_bits =3D hdev->backend_fea= tures; + status->vhost_dev->protocol_features_bits =3D hdev->protocol_f= eatures; + } status->vhost_dev->features =3D qmp_decode_features(vdev->device_id, hdev->features); status->vhost_dev->acked_features =3D diff --git a/qapi/virtio.json b/qapi/virtio.json index e6dcee7b83..608b841a89 100644 --- a/qapi/virtio.json +++ b/qapi/virtio.json @@ -79,12 +79,20 @@ # # @vq-index: vhost_dev vq_index # +# @features-bits: vhost_dev features in decimal format +# # @features: vhost_dev features # +# @acked-features-bits: vhost_dev acked_features in decimal format +# # @acked-features: vhost_dev acked_features # +# @backend-features-bits: vhost_dev backend_features in decimal format +# # @backend-features: vhost_dev backend_features # +# @protocol-features-bits: vhost_dev protocol_features in decimal format +# # @protocol-features: vhost_dev protocol_features # # @max-queues: vhost_dev max_queues @@ -102,9 +110,13 @@ 'n-tmp-sections': 'int', 'nvqs': 'uint32', 'vq-index': 'int', + 'features-bits': 'uint64', 'features': 'VirtioDeviceFeatures', + 'acked-features-bits': 'uint64', 'acked-features': 'VirtioDeviceFeatures', + 'backend-features-bits': 'uint64', 'backend-features': 'VirtioDeviceFeatures', + 'protocol-features-bits': 'uint64', 'protocol-features': 'VhostDeviceProtocols', 'max-queues': 'uint64', 'backend-cap': 'uint64', @@ -124,10 +136,16 @@ # # @vhost-started: VirtIODevice vhost_started flag # +# @guest-features-bits: VirtIODevice guest_features in decimal format +# # @guest-features: VirtIODevice guest_features # +# @host-features-bits: VirtIODevice host_features in decimal format +# # @host-features: VirtIODevice host_features # +# @backend-features-bits: VirtIODevice backend_features in decimal format +# # @backend-features: VirtIODevice backend_features # # @device-endian: VirtIODevice device_endian @@ -135,6 +153,9 @@ # @num-vqs: VirtIODevice virtqueue count. This is the number of # active virtqueues being used by the VirtIODevice. # +# @status-bits: VirtIODevice configuration status in decimal format +# (VirtioDeviceStatus) +# # @status: VirtIODevice configuration status (VirtioDeviceStatus) # # @isr: VirtIODevice ISR @@ -170,10 +191,14 @@ 'device-id': 'uint16', 'vhost-started': 'bool', 'device-endian': 'str', + 'guest-features-bits': 'uint64', 'guest-features': 'VirtioDeviceFeatures', + 'host-features-bits': 'uint64', 'host-features': 'VirtioDeviceFeatures', + 'backend-features-bits': 'uint64', 'backend-features': 'VirtioDeviceFeatures', 'num-vqs': 'int', + 'status-bits': 'uint8', 'status': 'VirtioDeviceStatus', 'isr': 'uint8', 'queue-sel': 'uint16', @@ -195,6 +220,9 @@ # # @path: Canonical QOM path of the VirtIODevice # +# @show-bits: Whether to display the feature & status bits. +# Default is disabled. (Since 8.2) +# # Features: # # @unstable: This command is meant for debugging. @@ -208,7 +236,8 @@ # 1. Poll for the status of virtio-crypto (no vhost-crypto active) # # -> { "execute": "x-query-virtio-status", -# "arguments": { "path": "/machine/peripheral/crypto0/virtio-backend"= } +# "arguments": { "path": "/machine/peripheral/crypto0/virtio-backend", +# "show-bits": true } # } # <- { "return": { # "device-endian": "little", @@ -216,6 +245,7 @@ # "disable-legacy-check": false, # "name": "virtio-crypto", # "started": true, +# "guest-features-bits": 5100273664, # "device-id": 20, # "backend-features": { # "transports": [], @@ -241,6 +271,7 @@ # "VIRTIO_F_VERSION_1: Device compliant for v1 spec (lega= cy)" # ] # }, +# "host-features-bits": 6325010432, # "host-features": { # "unknown-dev-features": 1073741824, # "dev-features": [], @@ -252,9 +283,11 @@ # "VIRTIO_F_NOTIFY_ON_EMPTY: Notify when device runs out = of avail. descs. on VQ" # ] # }, +# "backend-features-bits": 0, # "use-guest-notifier-mask": true, # "vm-running": true, # "queue-sel": 1, +# "status-bits": 15, # "disabled": false, # "vhost-started": false, # "use-started": true @@ -264,7 +297,8 @@ # 2. Poll for the status of virtio-net (vhost-net is active) # # -> { "execute": "x-query-virtio-status", -# "arguments": { "path": "/machine/peripheral-anon/device[1]/virtio-b= ackend" } +# "arguments": { "path": "/machine/peripheral-anon/device[1]/virtio-b= ackend", +# "show-bits": true } # } # <- { "return": { # "device-endian": "little", @@ -272,11 +306,13 @@ # "disabled-legacy-check": false, # "name": "virtio-net", # "started": true, +# "guest-features-bits": 5111807911, # "device-id": 1, # "vhost-dev": { # "n-tmp-sections": 4, # "n-mem-sections": 4, # "max-queues": 1, +# "features-bits": 13908344832 # "backend-cap": 2, # "log-size": 0, # "backend-features": { @@ -284,6 +320,8 @@ # "transports": [] # }, # "nvqs": 2, +# "acked-features-bits": 5100306432, +# "backend-features-bits": 0, # "protocol-features": { # "protocols": [] # }, @@ -299,6 +337,7 @@ # "VIRTIO_F_VERSION_1: Device compliant for v1 spec (= legacy)" # ] # }, +# "protocol-features-bits": 0, # "features": { # "dev-features": [ # "VHOST_F_LOG_ALL: Logging write descriptors support= ed", @@ -387,6 +426,7 @@ # "VIRTIO_F_VERSION_1: Device compliant for v1 spec (lega= cy)" # ] # }, +# "host-features-bits": 6337593319, # "host-features": { # "dev-features": [ # "VHOST_USER_F_PROTOCOL_FEATURES: Vhost-user protocol fe= atures negotiation supported", @@ -420,9 +460,11 @@ # "VIRTIO_F_NOTIFY_ON_EMPTY: Notify when device runs out = of avail. descs. on VQ" # ] # }, +# "backend-features-bits": 6337593319, # "use-guest-notifier-mask": true, # "vm-running": true, # "queue-sel": 2, +# "status-bits": 15, # "disabled": false, # "vhost-started": true, # "use-started": true @@ -430,7 +472,8 @@ # } ## { 'command': 'x-query-virtio-status', - 'data': { 'path': 'str' }, + 'data': { 'path': 'str', + '*show-bits': 'bool'}, 'returns': 'VirtioStatus', 'features': [ 'unstable' ] } =20 --=20 2.39.1