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Tsirkin" To: Jason Wang Subject: Re: [PATCH V2 1/5] virtio: use virtio_device_ready() in virtio_device_restore() Message-ID: <20220406073803-mutt-send-email-mst@kernel.org> References: <20220406083538.16274-1-jasowang@redhat.com> <20220406083538.16274-2-jasowang@redhat.com> MIME-Version: 1.0 In-Reply-To: <20220406083538.16274-2-jasowang@redhat.com> Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=mst@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Disposition: inline Cc: "Paul E. McKenney" , peterz@infradead.org, maz@kernel.org, linux-kernel@vger.kernel.org, virtualization@lists.linux-foundation.org, tglx@linutronix.de X-BeenThere: virtualization@lists.linux-foundation.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: Linux virtualization List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: virtualization-bounces@lists.linux-foundation.org Sender: "Virtualization" patch had wrong mime type. I managed to extra it but pls fix. > > > From: Stefano Garzarella > > It will allows us will allow us > to do extension on virtio_device_ready() without > duplicating codes. code > > Cc: Thomas Gleixner > Cc: Peter Zijlstra > Cc: "Paul E. McKenney" > Cc: Marc Zyngier > Signed-off-by: Stefano Garzarella > Signed-off-by: Jason Wang > --- > drivers/virtio/virtio.c | 5 +++-- > 1 file changed, 3 insertions(+), 2 deletions(-) > > diff --git a/drivers/virtio/virtio.c b/drivers/virtio/virtio.c > index 22f15f444f75..75c8d560bbd3 100644 > --- a/drivers/virtio/virtio.c > +++ b/drivers/virtio/virtio.c > @@ -526,8 +526,9 @@ int virtio_device_restore(struct virtio_device *dev) > goto err; > } > > - /* Finally, tell the device we're all set */ > - virtio_add_status(dev, VIRTIO_CONFIG_S_DRIVER_OK); > + /* If restore didn't do it, mark device DRIVER_OK ourselves. */ > + if (!(dev->config->get_status(dev) & VIRTIO_CONFIG_S_DRIVER_OK)) > + virtio_device_ready(dev); > > virtio_config_enable(dev); it's unfortunate that this adds an extra vmexit since virtio_device_ready calls get_status too. We now have: static inline void virtio_device_ready(struct virtio_device *dev) { unsigned status = dev->config->get_status(dev); BUG_ON(status & VIRTIO_CONFIG_S_DRIVER_OK); dev->config->set_status(dev, status | VIRTIO_CONFIG_S_DRIVER_OK); } I propose adding a helper and putting common code there. > > -- > 2.25.1 _______________________________________________ Virtualization mailing list Virtualization@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/virtualization