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Tsirkin" To: Jason Wang Cc: Stefan Hajnoczi , Kangjie Xu , qemu-devel@nongnu.org, Peter Maydell , Xuan Zhuo Subject: Re: [PULL v4 29/83] virtio: introduce virtio_queue_enable() Message-ID: <20221109014751-mutt-send-email-mst@kernel.org> References: <20221107224600.934080-1-mst@redhat.com> <20221107224600.934080-30-mst@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: Received-SPF: pass client-ip=170.10.133.124; envelope-from=mst@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H2=-0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 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+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org On Wed, Nov 09, 2022 at 11:31:23AM +0800, Jason Wang wrote: > On Wed, Nov 9, 2022 at 3:43 AM Stefan Hajnoczi wrote: > > > > On Mon, 7 Nov 2022 at 18:10, Michael S. Tsirkin wrote: > > > > > > From: Kangjie Xu > > > > > > Introduce the interface queue_enable() in VirtioDeviceClass and the > > > fucntion virtio_queue_enable() in virtio, it can be called when > > > VIRTIO_PCI_COMMON_Q_ENABLE is written and related virtqueue can be > > > started. It only supports the devices of virtio 1 or later. The > > > not-supported devices can only start the virtqueue when DRIVER_OK. > > > > > > Signed-off-by: Kangjie Xu > > > Signed-off-by: Xuan Zhuo > > > Acked-by: Jason Wang > > > Message-Id: <20221017092558.111082-4-xuanzhuo@linux.alibaba.com> > > > Reviewed-by: Michael S. Tsirkin > > > Signed-off-by: Michael S. Tsirkin > > > --- > > > include/hw/virtio/virtio.h | 2 ++ > > > hw/virtio/virtio.c | 14 ++++++++++++++ > > > 2 files changed, 16 insertions(+) > > > > > > diff --git a/include/hw/virtio/virtio.h b/include/hw/virtio/virtio.h > > > index 74d76c1dbc..b00b3fcf31 100644 > > > --- a/include/hw/virtio/virtio.h > > > +++ b/include/hw/virtio/virtio.h > > > @@ -149,6 +149,7 @@ struct VirtioDeviceClass { > > > void (*reset)(VirtIODevice *vdev); > > > void (*set_status)(VirtIODevice *vdev, uint8_t val); > > > void (*queue_reset)(VirtIODevice *vdev, uint32_t queue_index); > > > + void (*queue_enable)(VirtIODevice *vdev, uint32_t queue_index); > > > /* For transitional devices, this is a bitmap of features > > > * that are only exposed on the legacy interface but not > > > * the modern one. > > > @@ -288,6 +289,7 @@ int virtio_queue_set_host_notifier_mr(VirtIODevice *vdev, int n, > > > int virtio_set_status(VirtIODevice *vdev, uint8_t val); > > > void virtio_reset(void *opaque); > > > void virtio_queue_reset(VirtIODevice *vdev, uint32_t queue_index); > > > +void virtio_queue_enable(VirtIODevice *vdev, uint32_t queue_index); > > > void virtio_update_irq(VirtIODevice *vdev); > > > int virtio_set_features(VirtIODevice *vdev, uint64_t val); > > > > > > diff --git a/hw/virtio/virtio.c b/hw/virtio/virtio.c > > > index cf5f9ca387..9683b2e158 100644 > > > --- a/hw/virtio/virtio.c > > > +++ b/hw/virtio/virtio.c > > > @@ -2495,6 +2495,20 @@ void virtio_queue_reset(VirtIODevice *vdev, uint32_t queue_index) > > > __virtio_queue_reset(vdev, queue_index); > > > } > > > > > > +void virtio_queue_enable(VirtIODevice *vdev, uint32_t queue_index) > > > +{ > > > + VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev); > > > + > > > + if (!virtio_vdev_has_feature(vdev, VIRTIO_F_VERSION_1)) { > > > + error_report("queue_enable is only suppported in devices of virtio " > > > + "1.0 or later."); > > > > Why is this triggering here? Maybe virtio_queue_enable() is called too > > early. I have verified that the Linux guest driver sets VERSION_1. I > > didn't check what SeaBIOS does. > > Looks like a bug, we should check device features here at least and it > should be guest errors instead of error_report() here. > > Thanks But it's weird, queue enable is written before guest features? How come? > > > > $ build/qemu-system-x86_64 -M accel=kvm -m 1G -cpu host -blockdev > > file,node-name=drive0,filename=test.img -device > > virtio-blk-pci,drive=drive0 > > qemu: queue_enable is only suppported in devices of virtio 1.0 or later. > > > > Stefan > >