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Tsirkin" To: Alex =?iso-8859-1?Q?Benn=E9e?= Cc: qemu-devel@nongnu.org, fam@euphon.net, berrange@redhat.com, f4bug@amsat.org, aurelien@aurel32.net, pbonzini@redhat.com, stefanha@redhat.com, crosa@redhat.com, Raphael Norwitz , Kevin Wolf , Hanna Reitz , "Dr. David Alan Gilbert" , Viresh Kumar , Mathieu Poirier , "open list:Block layer core" , "open list:virtiofs" Subject: Re: [PATCH v1 5/9] hw/virtio: introduce virtio_device_should_start Message-ID: <20221108043249-mutt-send-email-mst@kernel.org> References: <20221108092308.1717426-1-alex.bennee@linaro.org> <20221108092308.1717426-6-alex.bennee@linaro.org> MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <20221108092308.1717426-6-alex.bennee@linaro.org> Received-SPF: pass client-ip=170.10.129.124; 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 Tue, Nov 08, 2022 at 09:23:04AM +0000, Alex Bennée wrote: > The previous fix to virtio_device_started revealed a problem in its > use by both the core and the device code. The core code should be able > to handle the device "starting" while the VM isn't running to handle > the restoration of migration state. To solve this dual use introduce a > new helper for use by the vhost-user backends who all use it to feed a > should_start variable. > > We can also pick up a change vhost_user_blk_set_status while we are at > it which follows the same pattern. > > Fixes: 9f6bcfd99f (hw/virtio: move vm_running check to virtio_device_started) > Fixes: 27ba7b027f (hw/virtio: add boilerplate for vhost-user-gpio device) > Signed-off-by: Alex Bennée > Cc: "Michael S. Tsirkin" why is this in this patchset? > --- > include/hw/virtio/virtio.h | 18 ++++++++++++++++++ > hw/block/vhost-user-blk.c | 6 +----- > hw/virtio/vhost-user-fs.c | 2 +- > hw/virtio/vhost-user-gpio.c | 2 +- > hw/virtio/vhost-user-i2c.c | 2 +- > hw/virtio/vhost-user-rng.c | 2 +- > hw/virtio/vhost-user-vsock.c | 2 +- > hw/virtio/vhost-vsock.c | 2 +- > 8 files changed, 25 insertions(+), 11 deletions(-) > > diff --git a/include/hw/virtio/virtio.h b/include/hw/virtio/virtio.h > index f41b4a7e64..3191c618f3 100644 > --- a/include/hw/virtio/virtio.h > +++ b/include/hw/virtio/virtio.h > @@ -389,6 +389,24 @@ static inline bool virtio_device_started(VirtIODevice *vdev, uint8_t status) > return vdev->started; > } > > + return status & VIRTIO_CONFIG_S_DRIVER_OK; > +} > + > +/** > + * virtio_device_should_start() - check if device startable > + * @vdev - the VirtIO device > + * @status - the devices status bits > + * > + * This is similar to virtio_device_started() but also encapsulates a > + * check on the VM status which would prevent a device starting > + * anyway. > + */ > +static inline bool virtio_device_should_start(VirtIODevice *vdev, uint8_t status) > +{ > + if (vdev->use_started) { > + return vdev->started; > + } > + > if (!vdev->vm_running) { > return false; > } > diff --git a/hw/block/vhost-user-blk.c b/hw/block/vhost-user-blk.c > index 13bf5cc47a..8feaf12e4e 100644 > --- a/hw/block/vhost-user-blk.c > +++ b/hw/block/vhost-user-blk.c > @@ -222,14 +222,10 @@ static void vhost_user_blk_stop(VirtIODevice *vdev) > static void vhost_user_blk_set_status(VirtIODevice *vdev, uint8_t status) > { > VHostUserBlk *s = VHOST_USER_BLK(vdev); > - bool should_start = virtio_device_started(vdev, status); > + bool should_start = virtio_device_should_start(vdev, status); > Error *local_err = NULL; > int ret; > > - if (!vdev->vm_running) { > - should_start = false; > - } > - > if (!s->connected) { > return; > } > diff --git a/hw/virtio/vhost-user-fs.c b/hw/virtio/vhost-user-fs.c > index ad0f91c607..1c40f42045 100644 > --- a/hw/virtio/vhost-user-fs.c > +++ b/hw/virtio/vhost-user-fs.c > @@ -123,7 +123,7 @@ static void vuf_stop(VirtIODevice *vdev) > static void vuf_set_status(VirtIODevice *vdev, uint8_t status) > { > VHostUserFS *fs = VHOST_USER_FS(vdev); > - bool should_start = virtio_device_started(vdev, status); > + bool should_start = virtio_device_should_start(vdev, status); > > if (vhost_dev_is_started(&fs->vhost_dev) == should_start) { > return; > diff --git a/hw/virtio/vhost-user-gpio.c b/hw/virtio/vhost-user-gpio.c > index 8b40fe450c..677d1c7730 100644 > --- a/hw/virtio/vhost-user-gpio.c > +++ b/hw/virtio/vhost-user-gpio.c > @@ -152,7 +152,7 @@ static void vu_gpio_stop(VirtIODevice *vdev) > static void vu_gpio_set_status(VirtIODevice *vdev, uint8_t status) > { > VHostUserGPIO *gpio = VHOST_USER_GPIO(vdev); > - bool should_start = virtio_device_started(vdev, status); > + bool should_start = virtio_device_should_start(vdev, status); > > trace_virtio_gpio_set_status(status); > > diff --git a/hw/virtio/vhost-user-i2c.c b/hw/virtio/vhost-user-i2c.c > index bc58b6c0d1..864eba695e 100644 > --- a/hw/virtio/vhost-user-i2c.c > +++ b/hw/virtio/vhost-user-i2c.c > @@ -93,7 +93,7 @@ static void vu_i2c_stop(VirtIODevice *vdev) > static void vu_i2c_set_status(VirtIODevice *vdev, uint8_t status) > { > VHostUserI2C *i2c = VHOST_USER_I2C(vdev); > - bool should_start = virtio_device_started(vdev, status); > + bool should_start = virtio_device_should_start(vdev, status); > > if (vhost_dev_is_started(&i2c->vhost_dev) == should_start) { > return; > diff --git a/hw/virtio/vhost-user-rng.c b/hw/virtio/vhost-user-rng.c > index bc1f36c5ac..8b47287875 100644 > --- a/hw/virtio/vhost-user-rng.c > +++ b/hw/virtio/vhost-user-rng.c > @@ -90,7 +90,7 @@ static void vu_rng_stop(VirtIODevice *vdev) > static void vu_rng_set_status(VirtIODevice *vdev, uint8_t status) > { > VHostUserRNG *rng = VHOST_USER_RNG(vdev); > - bool should_start = virtio_device_started(vdev, status); > + bool should_start = virtio_device_should_start(vdev, status); > > if (vhost_dev_is_started(&rng->vhost_dev) == should_start) { > return; > diff --git a/hw/virtio/vhost-user-vsock.c b/hw/virtio/vhost-user-vsock.c > index 7b67e29d83..9431b9792c 100644 > --- a/hw/virtio/vhost-user-vsock.c > +++ b/hw/virtio/vhost-user-vsock.c > @@ -55,7 +55,7 @@ const VhostDevConfigOps vsock_ops = { > static void vuv_set_status(VirtIODevice *vdev, uint8_t status) > { > VHostVSockCommon *vvc = VHOST_VSOCK_COMMON(vdev); > - bool should_start = virtio_device_started(vdev, status); > + bool should_start = virtio_device_should_start(vdev, status); > > if (vhost_dev_is_started(&vvc->vhost_dev) == should_start) { > return; > diff --git a/hw/virtio/vhost-vsock.c b/hw/virtio/vhost-vsock.c > index 7dc3c73931..aa16d584ee 100644 > --- a/hw/virtio/vhost-vsock.c > +++ b/hw/virtio/vhost-vsock.c > @@ -70,7 +70,7 @@ static int vhost_vsock_set_running(VirtIODevice *vdev, int start) > static void vhost_vsock_set_status(VirtIODevice *vdev, uint8_t status) > { > VHostVSockCommon *vvc = VHOST_VSOCK_COMMON(vdev); > - bool should_start = virtio_device_started(vdev, status); > + bool should_start = virtio_device_should_start(vdev, status); > int ret; > > if (vhost_dev_is_started(&vvc->vhost_dev) == should_start) { > -- > 2.34.1