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Tsirkin" To: qemu-devel@nongnu.org Cc: Peter Maydell , Laszlo Ersek , Eugenio Perez Martin , German Maglione , Liu Jiang , Sergio Lopez Pascual , Stefano Garzarella , Philippe =?utf-8?Q?Mathieu-Daud=C3=A9?= , Albert Esteve Subject: [PULL 34/83] vhost-user: allow "vhost_set_vring" to wait for a reply Message-ID: <3c501fe5baf0a50cda8f6da2d80c5f5c7c5c6eaf.1697644299.git.mst@redhat.com> References: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Disposition: inline Content-Transfer-Encoding: quoted-printable In-Reply-To: X-Mailer: git-send-email 2.27.0.106.g8ac3dc51b1 X-Mutt-Fcc: =sent Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.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_H4=0.001, RCVD_IN_MSPIKE_WL=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+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @redhat.com) X-ZM-MESSAGEID: 1697644894901100001 From: Laszlo Ersek The "vhost_set_vring" function already centralizes the common parts of "vhost_user_set_vring_num", "vhost_user_set_vring_base" and "vhost_user_set_vring_enable". We'll want to allow some of those callers to wait for a reply. Therefore, rebase "vhost_set_vring" from just "vhost_user_write" to "vhost_user_write_sync", exposing the "wait_for_reply" parameter. This is purely refactoring -- there is no observable change. That's because: - all three callers pass in "false" for "wait_for_reply", which disables all logic in "vhost_user_write_sync" except the call to "vhost_user_write"; - the fds=3DNULL and fd_num=3D0 arguments of the original "vhost_user_write" call inside "vhost_set_vring" are hard-coded within "vhost_user_write_sync". Cc: "Michael S. Tsirkin" (supporter:vhost) Cc: Eugenio Perez Martin Cc: German Maglione Cc: Liu Jiang Cc: Sergio Lopez Pascual Cc: Stefano Garzarella Signed-off-by: Laszlo Ersek Reviewed-by: Philippe Mathieu-Daud=C3=A9 Reviewed-by: Stefano Garzarella Tested-by: Albert Esteve Reviewed-by: Eugenio P=C3=A9rez Message-Id: <20231002203221.17241-7-lersek@redhat.com> Reviewed-by: Michael S. Tsirkin Signed-off-by: Michael S. Tsirkin --- hw/virtio/vhost-user.c | 11 ++++++----- 1 file changed, 6 insertions(+), 5 deletions(-) diff --git a/hw/virtio/vhost-user.c b/hw/virtio/vhost-user.c index 3c14947589..7e452849fa 100644 --- a/hw/virtio/vhost-user.c +++ b/hw/virtio/vhost-user.c @@ -1160,7 +1160,8 @@ static int vhost_user_write_sync(struct vhost_dev *de= v, VhostUserMsg *msg, =20 static int vhost_set_vring(struct vhost_dev *dev, unsigned long int request, - struct vhost_vring_state *ring) + struct vhost_vring_state *ring, + bool wait_for_reply) { VhostUserMsg msg =3D { .hdr.request =3D request, @@ -1169,13 +1170,13 @@ static int vhost_set_vring(struct vhost_dev *dev, .hdr.size =3D sizeof(msg.payload.state), }; =20 - return vhost_user_write(dev, &msg, NULL, 0); + return vhost_user_write_sync(dev, &msg, wait_for_reply); } =20 static int vhost_user_set_vring_num(struct vhost_dev *dev, struct vhost_vring_state *ring) { - return vhost_set_vring(dev, VHOST_USER_SET_VRING_NUM, ring); + return vhost_set_vring(dev, VHOST_USER_SET_VRING_NUM, ring, false); } =20 static void vhost_user_host_notifier_free(VhostUserHostNotifier *n) @@ -1206,7 +1207,7 @@ static void vhost_user_host_notifier_remove(VhostUser= HostNotifier *n, static int vhost_user_set_vring_base(struct vhost_dev *dev, struct vhost_vring_state *ring) { - return vhost_set_vring(dev, VHOST_USER_SET_VRING_BASE, ring); + return vhost_set_vring(dev, VHOST_USER_SET_VRING_BASE, ring, false); } =20 static int vhost_user_set_vring_enable(struct vhost_dev *dev, int enable) @@ -1224,7 +1225,7 @@ static int vhost_user_set_vring_enable(struct vhost_d= ev *dev, int enable) .num =3D enable, }; =20 - ret =3D vhost_set_vring(dev, VHOST_USER_SET_VRING_ENABLE, &state); + ret =3D vhost_set_vring(dev, VHOST_USER_SET_VRING_ENABLE, &state, = false); if (ret < 0) { /* * Restoring the previous state is likely infeasible, as well = as --=20 MST