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Gecko/20100101 Thunderbird/91.5.0 Subject: Re: [PATCH 05/31] vhost: Add Shadow VirtQueue kick forwarding capabilities To: =?UTF-8?Q?Eugenio_P=c3=a9rez?= , qemu-devel@nongnu.org References: <20220121202733.404989-1-eperezma@redhat.com> <20220121202733.404989-6-eperezma@redhat.com> From: Jason Wang In-Reply-To: <20220121202733.404989-6-eperezma@redhat.com> Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=jasowang@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Language: en-US Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit Received-SPF: pass client-ip=170.10.133.124; envelope-from=jasowang@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -29 X-Spam_score: -3.0 X-Spam_bar: --- X-Spam_report: (-3.0 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.167, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, NICE_REPLY_A=-0.001, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H2=-0.001, SPF_HELO_NONE=0.001, SPF_PASS=-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: , Cc: Laurent Vivier , Parav Pandit , Cindy Lu , "Michael S. Tsirkin" , Juan Quintela , Richard Henderson , Markus Armbruster , Gautam Dawar , virtualization@lists.linux-foundation.org, Eduardo Habkost , Harpreet Singh Anand , Xiao W Wang , Peter Xu , Stefan Hajnoczi , Eli Cohen , Paolo Bonzini , Zhu Lingshan , Eric Blake , Stefano Garzarella Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" 在 2022/1/22 上午4:27, Eugenio Pérez 写道: > At this mode no buffer forwarding will be performed in SVQ mode: Qemu > will just forward the guest's kicks to the device. > > Also, host notifiers must be disabled at SVQ start, and they will not > start if SVQ has been enabled when the device is stopped. This will be > addressed in next patches. We need to disable host_notifier_mr as well, otherwise guest may touch the hardware doorbell directly without going through eventfd. > > Signed-off-by: Eugenio Pérez > --- > hw/virtio/vhost-shadow-virtqueue.h | 2 ++ > hw/virtio/vhost-shadow-virtqueue.c | 27 ++++++++++++++++++++++++++- > 2 files changed, 28 insertions(+), 1 deletion(-) > > diff --git a/hw/virtio/vhost-shadow-virtqueue.h b/hw/virtio/vhost-shadow-virtqueue.h > index a56ecfc09d..4c583a9171 100644 > --- a/hw/virtio/vhost-shadow-virtqueue.h > +++ b/hw/virtio/vhost-shadow-virtqueue.h > @@ -19,6 +19,8 @@ void vhost_svq_set_svq_kick_fd(VhostShadowVirtqueue *svq, int svq_kick_fd); > const EventNotifier *vhost_svq_get_dev_kick_notifier( > const VhostShadowVirtqueue *svq); > > +void vhost_svq_stop(VhostShadowVirtqueue *svq); > + > VhostShadowVirtqueue *vhost_svq_new(void); > > void vhost_svq_free(VhostShadowVirtqueue *vq); > diff --git a/hw/virtio/vhost-shadow-virtqueue.c b/hw/virtio/vhost-shadow-virtqueue.c > index 21534bc94d..8991f0b3c3 100644 > --- a/hw/virtio/vhost-shadow-virtqueue.c > +++ b/hw/virtio/vhost-shadow-virtqueue.c > @@ -42,11 +42,26 @@ const EventNotifier *vhost_svq_get_dev_kick_notifier( > return &svq->hdev_kick; > } > > +/* Forward guest notifications */ > +static void vhost_handle_guest_kick(EventNotifier *n) > +{ > + VhostShadowVirtqueue *svq = container_of(n, VhostShadowVirtqueue, > + svq_kick); > + > + if (unlikely(!event_notifier_test_and_clear(n))) { > + return; > + } > + > + event_notifier_set(&svq->hdev_kick); > +} > + > /** > * Set a new file descriptor for the guest to kick SVQ and notify for avail > * > * @svq The svq > - * @svq_kick_fd The new svq kick fd > + * @svq_kick_fd The svq kick fd > + * > + * Note that SVQ will never close the old file descriptor. > */ > void vhost_svq_set_svq_kick_fd(VhostShadowVirtqueue *svq, int svq_kick_fd) > { > @@ -65,12 +80,22 @@ void vhost_svq_set_svq_kick_fd(VhostShadowVirtqueue *svq, int svq_kick_fd) > * need to explicitely check for them. > */ > event_notifier_init_fd(&svq->svq_kick, svq_kick_fd); > + event_notifier_set_handler(&svq->svq_kick, vhost_handle_guest_kick); > > if (!check_old || event_notifier_test_and_clear(&tmp)) { > event_notifier_set(&svq->hdev_kick); > } > } > > +/** > + * Stop shadow virtqueue operation. > + * @svq Shadow Virtqueue > + */ > +void vhost_svq_stop(VhostShadowVirtqueue *svq) > +{ > + event_notifier_set_handler(&svq->svq_kick, NULL); > +} This function is not used in the patch. Thanks > + > /** > * Creates vhost shadow virtqueue, and instruct vhost device to use the shadow > * methods and file descriptors.