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Wed, 10 Nov 2021 13:52:18 +0000 (UTC) Received: from blackfin.pond.sub.org (ovpn-112-7.ams2.redhat.com [10.36.112.7]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 2769160C17; Wed, 10 Nov 2021 13:52:18 +0000 (UTC) Received: by blackfin.pond.sub.org (Postfix, from userid 1000) id C6B0C11380A7; Wed, 10 Nov 2021 14:52:16 +0100 (CET) From: Markus Armbruster To: Jonah Palmer Subject: Re: [PATCH v9 7/8] qmp: add QMP command x-query-virtio-queue-element References: <1636539792-20967-1-git-send-email-jonah.palmer@oracle.com> <1636539792-20967-8-git-send-email-jonah.palmer@oracle.com> Date: Wed, 10 Nov 2021 14:52:16 +0100 In-Reply-To: <1636539792-20967-8-git-send-email-jonah.palmer@oracle.com> (Jonah Palmer's message of "Wed, 10 Nov 2021 05:23:11 -0500") Message-ID: <87a6icw227.fsf@dusky.pond.sub.org> User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/27.2 (gnu/linux) MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.12 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=armbru@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain Received-SPF: pass client-ip=216.205.24.124; envelope-from=armbru@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -34 X-Spam_score: -3.5 X-Spam_bar: --- X-Spam_report: (-3.5 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.699, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H2=-0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=unavailable 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: , Cc: mst@redhat.com, qemu_oss@crudebyte.com, qemu-devel@nongnu.org, kraxel@redhat.com, si-wei.liu@oracle.com, joao.m.martins@oracle.com, eblake@redhat.com, qemu-block@nongnu.org, david@redhat.com, arei.gonglei@huawei.com, marcandre.lureau@redhat.com, lvivier@redhat.com, thuth@redhat.com, michael.roth@amd.com, groug@kaod.org, dgilbert@redhat.com, eric.auger@redhat.com, stefanha@redhat.com, boris.ostrovsky@oracle.com, kwolf@redhat.com, mathieu.poirier@linaro.org, raphael.norwitz@nutanix.com, pbonzini@redhat.com Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" Jonah Palmer writes: > From: Laurent Vivier > > This new command shows the information of a VirtQueue element. > > Signed-off-by: Jonah Palmer [...] > diff --git a/qapi/virtio.json b/qapi/virtio.json > index 0f65044..c57fbc5 100644 > --- a/qapi/virtio.json > +++ b/qapi/virtio.json > @@ -1061,3 +1061,180 @@ > { 'command': 'x-query-virtio-vhost-queue-status', > 'data': { 'path': 'str', 'queue': 'uint16' }, > 'returns': 'VirtVhostQueueStatus', 'features': [ 'unstable' ] } > + > +## > +# @VirtioRingDescFlags: > +# > +# An enumeration of the virtio ring descriptor flags > +# > +# Since: 6.3 > +# > +## > + > +{ 'enum': 'VirtioRingDescFlags', > + 'data': [ 'next', 'write', 'indirect', 'avail', 'used' ] > +} > + > +## > +# @VirtioRingDesc: > +# > +# Information regarding the VRing descriptor area > +# > +# @addr: guest physical address of the descriptor data > +# > +# @len: length of the descriptor data > +# > +# @flags: list of descriptor flags > +# > +# Since: 6.3 > +# > +## > + > +{ 'struct': 'VirtioRingDesc', > + 'data': { 'addr': 'uint64', > + 'len': 'uint32', > + 'flags': [ 'VirtioRingDescFlags' ] } } > + > +## > +# @VirtioRingAvail: > +# > +# Information regarding the avail VRing (also known as the driver > +# area) > +# > +# @flags: VRingAvail flags > +# > +# @idx: VRingAvail index > +# > +# @ring: VRingAvail ring[] entry at provided index > +# > +# Since: 6.3 > +# > +## > + > +{ 'struct': 'VirtioRingAvail', > + 'data': { 'flags': 'uint16', > + 'idx': 'uint16', > + 'ring': 'uint16' } } > + > +## > +# @VirtioRingUsed: > +# > +# Information regarding the used VRing (also known as the device > +# area) > +# > +# @flags: VRingUsed flags > +# > +# @idx: VRingUsed index > +# > +# Since: 6.3 > +# > +## > + > +{ 'struct': 'VirtioRingUsed', > + 'data': { 'flags': 'uint16', > + 'idx': 'uint16' } } > + > +## > +# @VirtioQueueElement: > +# > +# Information regarding a VirtQueue VirtQueueElement including > +# descriptor, driver, and device areas > +# > +# @device-name: name of the VirtIODevice which this VirtQueue belongs > +# to (for reference) > +# > +# @index: index of the element in the queue > +# > +# @ndescs: number of descriptors > +# > +# @descs: list of the descriptors Can @ndescs ever be not equal to the length of @descs? If no, it's redundant. > +# > +# @avail: VRingAvail info > +# > +# @used: VRingUsed info > +# > +# Since: 6.3 > +# > +## > + > +{ 'struct': 'VirtioQueueElement', > + 'data': { 'device-name': 'str', > + 'index': 'uint32', > + 'ndescs': 'uint32', > + 'descs': [ 'VirtioRingDesc' ], > + 'avail': 'VirtioRingAvail', > + 'used': 'VirtioRingUsed' } } > + > +## > +# @x-query-virtio-queue-element: > +# > +# Return the information about a VirtQueue VirtQueueElement (by > +# default looks at the head of the queue) > +# > +# @path: VirtIODevice canonical QOM path > +# > +# @queue: VirtQueue index to examine > +# > +# @index: the index in the queue, by default head > +# > +# Features: > +# @unstable: This command is meant for debugging. > +# > +# Returns: VirtioQueueElement information > +# > +# Since: 6.3 > +# > +# Examples: > +# > +# 1. Introspect on virtio-net virtqueue 0 at index 5 > +# > +# -> { "execute": "x-query-virtio-queue-element", > +# "arguments": { "path": "/machine/peripheral-anon/device[1]/virtio-backend", > +# "queue": 0, > +# "index": 5 } > +# } > +# <- { "return": { > +# "index": 5, > +# "ndescs": 1, > +# "device-name": "virtio-net", > +# "descs": [ { "flags": ["write"], "len": 1536, "addr": 5257305600 } ], > +# "avail": { "idx": 256, "flags": 0, "ring": 5 }, > +# "used": { "idx": 13, "flags": 0 } } > +# } > +# > +# 2. Introspect on virtio-crypto virtqueue 1 at head > +# > +# -> { "execute": "x-query-virtio-queue-element", > +# "arguments": { "path": "/machine/peripheral/crypto0/virtio-backend", > +# "queue": 1 } > +# } > +# <- { "return": { > +# "index": 0, > +# "ndescs": 1, > +# "device-name": "virtio-crypto", > +# "descs": [ { "flags": [], "len": 0, "addr": 8080268923184214134 } ], > +# "avail": { "idx": 280, "flags": 0, "ring": 0 }, > +# "used": { "idx": 280, "flags": 0 } } > +# } > +# > +# 3. Introspect on virtio-scsi virtqueue 2 at head > +# > +# -> { "execute": "x-query-virtio-queue-element", > +# "arguments": { "path": "/machine/peripheral-anon/device[2]/virtio-backend", > +# "queue": 2 } > +# } > +# <- { "return": { > +# "index": 19, > +# "ndescs": 1, > +# "device-name": "virtio-scsi", > +# "descs": [ { "flags": ["used", "indirect", "write"], "len": 4099327944, > +# "addr": 12055409292258155293 } ], > +# "avail": { "idx": 1147, "flags": 0, "ring": 19 }, > +# "used": { "idx": 1147, "flags": 0 } } > +# } > +# > +## > + > +{ 'command': 'x-query-virtio-queue-element', > + 'data': { 'path': 'str', 'queue': 'uint16', '*index': 'uint16' }, > + 'returns': 'VirtioQueueElement', 'features': [ 'unstable' ] }