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[79.181.48.215]) by smtp.gmail.com with ESMTPSA id d8sm1802324qtr.53.2019.12.19.05.28.58 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 19 Dec 2019 05:28:59 -0800 (PST) Date: Thu, 19 Dec 2019 08:28:56 -0500 From: "Michael S. Tsirkin" To: qemu-devel@nongnu.org Subject: [PULL 23/24] vhost-user: add VHOST_USER_RESET_DEVICE to reset devices Message-ID: <20191219132621.16595-24-mst@redhat.com> References: <20191219132621.16595-1-mst@redhat.com> MIME-Version: 1.0 In-Reply-To: <20191219132621.16595-1-mst@redhat.com> X-Mailer: git-send-email 2.24.1.751.gd10ce2899c X-Mutt-Fcc: =sent X-MC-Unique: 1OYjnvGtMUmTZlmTY2eMWA-1 X-Mimecast-Spam-Score: 0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: quoted-printable Content-Disposition: inline X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] [fuzzy] X-Received-From: 207.211.31.120 X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Peter Maydell , David Vrabel , Raphael Norwitz Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" From: Raphael Norwitz Add a VHOST_USER_RESET_DEVICE message which will reset the vhost user backend. Disabling all rings, and resetting all internal state, ready for the backend to be reinitialized. A backend has to report it supports this features with the VHOST_USER_PROTOCOL_F_RESET_DEVICE protocol feature bit. If it does so, the new message is used instead of sending a RESET_OWNER which has had inconsistent implementations. Signed-off-by: David Vrabel Signed-off-by: Raphael Norwitz Message-Id: <1572385083-5254-2-git-send-email-raphael.norwitz@nutanix.com> Reviewed-by: Michael S. Tsirkin Signed-off-by: Michael S. Tsirkin --- hw/virtio/vhost-user.c | 8 +++++++- docs/interop/vhost-user.rst | 15 +++++++++++++++ 2 files changed, 22 insertions(+), 1 deletion(-) diff --git a/hw/virtio/vhost-user.c b/hw/virtio/vhost-user.c index 02a9b25199..d27a10fcc6 100644 --- a/hw/virtio/vhost-user.c +++ b/hw/virtio/vhost-user.c @@ -58,6 +58,7 @@ enum VhostUserProtocolFeature { VHOST_USER_PROTOCOL_F_SLAVE_SEND_FD =3D 10, VHOST_USER_PROTOCOL_F_HOST_NOTIFIER =3D 11, VHOST_USER_PROTOCOL_F_INFLIGHT_SHMFD =3D 12, + VHOST_USER_PROTOCOL_F_RESET_DEVICE =3D 13, VHOST_USER_PROTOCOL_F_MAX }; =20 @@ -98,6 +99,7 @@ typedef enum VhostUserRequest { VHOST_USER_GET_INFLIGHT_FD =3D 31, VHOST_USER_SET_INFLIGHT_FD =3D 32, VHOST_USER_GPU_SET_SOCKET =3D 33, + VHOST_USER_RESET_DEVICE =3D 34, VHOST_USER_MAX } VhostUserRequest; =20 @@ -890,10 +892,14 @@ static int vhost_user_set_owner(struct vhost_dev *dev= ) static int vhost_user_reset_device(struct vhost_dev *dev) { VhostUserMsg msg =3D { - .hdr.request =3D VHOST_USER_RESET_OWNER, .hdr.flags =3D VHOST_USER_VERSION, }; =20 + msg.hdr.request =3D virtio_has_feature(dev->protocol_features, + VHOST_USER_PROTOCOL_F_RESET_DEVIC= E) + ? VHOST_USER_RESET_DEVICE + : VHOST_USER_RESET_OWNER; + if (vhost_user_write(dev, &msg, NULL, 0) < 0) { return -1; } diff --git a/docs/interop/vhost-user.rst b/docs/interop/vhost-user.rst index 015ac08177..5f8b3a456b 100644 --- a/docs/interop/vhost-user.rst +++ b/docs/interop/vhost-user.rst @@ -785,6 +785,7 @@ Protocol features #define VHOST_USER_PROTOCOL_F_SLAVE_SEND_FD 10 #define VHOST_USER_PROTOCOL_F_HOST_NOTIFIER 11 #define VHOST_USER_PROTOCOL_F_INFLIGHT_SHMFD 12 + #define VHOST_USER_PROTOCOL_F_RESET_DEVICE 13 =20 Master message types -------------------- @@ -1190,6 +1191,20 @@ Master message types ancillary data. The GPU protocol is used to inform the master of rendering state and updates. See vhost-user-gpu.rst for details. =20 +``VHOST_USER_RESET_DEVICE`` + :id: 34 + :equivalent ioctl: N/A + :master payload: N/A + :slave payload: N/A + + Ask the vhost user backend to disable all rings and reset all + internal device state to the initial state, ready to be + reinitialized. The backend retains ownership of the device + throughout the reset operation. + + Only valid if the ``VHOST_USER_PROTOCOL_F_RESET_DEVICE`` protocol + feature is set by the backend. + Slave message types ------------------- =20 --=20 MST