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bh=40+8FGxYX4M17QGlu+S2jN8tGV56g5Bg2e+b0vt05Ro=; b=gJg7t3HdJk1sPM7rkhrraxduxrDMzGu5xKS+rHzqyzt5v+S9KLpPtOLmAiJKM4dpkM6dk/ PqpOyVAuIH/vp916tgMjpi3UMu2EiaRJxzEoZrQlczZa9jbQE5vfj84O4kxYsRBMZ13JVV NSdBkBYfgqT/7pJ2Ymeo05hu5s/X5Fs= X-MC-Unique: 4qUepDiVNXe4Ms-R70MNxg-1 From: Stefan Hajnoczi To: Peter Maydell , qemu-devel@nongnu.org Subject: [PULL 02/30] libvhost-user: Allow vu_message_read to be replaced Date: Fri, 9 Oct 2020 20:35:01 +0100 Message-Id: <20201009193529.322822-3-stefanha@redhat.com> In-Reply-To: <20201009193529.322822-1-stefanha@redhat.com> References: <20201009193529.322822-1-stefanha@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.15 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=stefanha@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; 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charset="utf-8" From: Coiby Xu Allow vu_message_read to be replaced by one which will make use of the QIOChannel functions. Thus reading vhost-user message won't stall the guest. For slave channel, we still use the default vu_message_read. Reviewed-by: Marc-Andr=C3=A9 Lureau Signed-off-by: Coiby Xu Reviewed-by: Stefan Hajnoczi Message-id: 20200918080912.321299-2-coiby.xu@gmail.com Signed-off-by: Stefan Hajnoczi --- contrib/libvhost-user/libvhost-user.h | 21 +++++++++++++++++++++ contrib/libvhost-user/libvhost-user-glib.c | 2 +- contrib/libvhost-user/libvhost-user.c | 14 +++++++------- tests/vhost-user-bridge.c | 2 ++ tools/virtiofsd/fuse_virtio.c | 4 ++-- 5 files changed, 33 insertions(+), 10 deletions(-) diff --git a/contrib/libvhost-user/libvhost-user.h b/contrib/libvhost-user/= libvhost-user.h index 287ac5fec7..3bbeae8587 100644 --- a/contrib/libvhost-user/libvhost-user.h +++ b/contrib/libvhost-user/libvhost-user.h @@ -36,6 +36,8 @@ */ #define VHOST_USER_MAX_RAM_SLOTS 32 =20 +#define VHOST_USER_HDR_SIZE offsetof(VhostUserMsg, payload.u64) + typedef enum VhostSetConfigType { VHOST_SET_CONFIG_TYPE_MASTER =3D 0, VHOST_SET_CONFIG_TYPE_MIGRATION =3D 1, @@ -221,6 +223,7 @@ typedef uint64_t (*vu_get_features_cb) (VuDev *dev); typedef void (*vu_set_features_cb) (VuDev *dev, uint64_t features); typedef int (*vu_process_msg_cb) (VuDev *dev, VhostUserMsg *vmsg, int *do_reply); +typedef bool (*vu_read_msg_cb) (VuDev *dev, int sock, VhostUserMsg *vmsg); typedef void (*vu_queue_set_started_cb) (VuDev *dev, int qidx, bool starte= d); typedef bool (*vu_queue_is_processed_in_order_cb) (VuDev *dev, int qidx); typedef int (*vu_get_config_cb) (VuDev *dev, uint8_t *config, uint32_t len= ); @@ -389,6 +392,23 @@ struct VuDev { bool broken; uint16_t max_queues; =20 + /* @read_msg: custom method to read vhost-user message + * + * Read data from vhost_user socket fd and fill up + * the passed VhostUserMsg *vmsg struct. + * + * If reading fails, it should close the received set of file + * descriptors as socket message's auxiliary data. + * + * For the details, please refer to vu_message_read in libvhost-user.c + * which will be used by default if not custom method is provided when + * calling vu_init + * + * Returns: true if vhost-user message successfully received, + * otherwise return false. + * + */ + vu_read_msg_cb read_msg; /* @set_watch: add or update the given fd to the watch set, * call cb when condition is met */ vu_set_watch_cb set_watch; @@ -432,6 +452,7 @@ bool vu_init(VuDev *dev, uint16_t max_queues, int socket, vu_panic_cb panic, + vu_read_msg_cb read_msg, vu_set_watch_cb set_watch, vu_remove_watch_cb remove_watch, const VuDevIface *iface); diff --git a/contrib/libvhost-user/libvhost-user-glib.c b/contrib/libvhost-= user/libvhost-user-glib.c index 53f1ca4cdd..0df2ec9271 100644 --- a/contrib/libvhost-user/libvhost-user-glib.c +++ b/contrib/libvhost-user/libvhost-user-glib.c @@ -147,7 +147,7 @@ vug_init(VugDev *dev, uint16_t max_queues, int socket, g_assert(dev); g_assert(iface); =20 - if (!vu_init(&dev->parent, max_queues, socket, panic, set_watch, + if (!vu_init(&dev->parent, max_queues, socket, panic, NULL, set_watch, remove_watch, iface)) { return false; } diff --git a/contrib/libvhost-user/libvhost-user.c b/contrib/libvhost-user/= libvhost-user.c index 9f1285b8a1..09bdff18f3 100644 --- a/contrib/libvhost-user/libvhost-user.c +++ b/contrib/libvhost-user/libvhost-user.c @@ -68,8 +68,6 @@ /* The version of inflight buffer */ #define INFLIGHT_VERSION 1 =20 -#define VHOST_USER_HDR_SIZE offsetof(VhostUserMsg, payload.u64) - /* The version of the protocol we support */ #define VHOST_USER_VERSION 1 #define LIBVHOST_USER_DEBUG 0 @@ -268,7 +266,7 @@ have_userfault(void) } =20 static bool -vu_message_read(VuDev *dev, int conn_fd, VhostUserMsg *vmsg) +vu_message_read_default(VuDev *dev, int conn_fd, VhostUserMsg *vmsg) { char control[CMSG_SPACE(VHOST_MEMORY_BASELINE_NREGIONS * sizeof(int))]= =3D {}; struct iovec iov =3D { @@ -416,7 +414,7 @@ vu_process_message_reply(VuDev *dev, const VhostUserMsg= *vmsg) goto out; } =20 - if (!vu_message_read(dev, dev->slave_fd, &msg_reply)) { + if (!vu_message_read_default(dev, dev->slave_fd, &msg_reply)) { goto out; } =20 @@ -907,7 +905,7 @@ vu_set_mem_table_exec_postcopy(VuDev *dev, VhostUserMsg= *vmsg) /* Wait for QEMU to confirm that it's registered the handler for the * faults. */ - if (!vu_message_read(dev, dev->sock, vmsg) || + if (!dev->read_msg(dev, dev->sock, vmsg) || vmsg->size !=3D sizeof(vmsg->payload.u64) || vmsg->payload.u64 !=3D 0) { vu_panic(dev, "failed to receive valid ack for postcopy set-mem-ta= ble"); @@ -1869,7 +1867,7 @@ vu_dispatch(VuDev *dev) int reply_requested; bool need_reply, success =3D false; =20 - if (!vu_message_read(dev, dev->sock, &vmsg)) { + if (!dev->read_msg(dev, dev->sock, &vmsg)) { goto end; } =20 @@ -1967,6 +1965,7 @@ vu_init(VuDev *dev, uint16_t max_queues, int socket, vu_panic_cb panic, + vu_read_msg_cb read_msg, vu_set_watch_cb set_watch, vu_remove_watch_cb remove_watch, const VuDevIface *iface) @@ -1984,6 +1983,7 @@ vu_init(VuDev *dev, =20 dev->sock =3D socket; dev->panic =3D panic; + dev->read_msg =3D read_msg ? read_msg : vu_message_read_default; dev->set_watch =3D set_watch; dev->remove_watch =3D remove_watch; dev->iface =3D iface; @@ -2349,7 +2349,7 @@ static void _vu_queue_notify(VuDev *dev, VuVirtq *vq,= bool sync) =20 vu_message_write(dev, dev->slave_fd, &vmsg); if (ack) { - vu_message_read(dev, dev->slave_fd, &vmsg); + vu_message_read_default(dev, dev->slave_fd, &vmsg); } return; } diff --git a/tests/vhost-user-bridge.c b/tests/vhost-user-bridge.c index 6c3d490611..bd43607a4d 100644 --- a/tests/vhost-user-bridge.c +++ b/tests/vhost-user-bridge.c @@ -520,6 +520,7 @@ vubr_accept_cb(int sock, void *ctx) VHOST_USER_BRIDGE_MAX_QUEUES, conn_fd, vubr_panic, + NULL, vubr_set_watch, vubr_remove_watch, &vuiface)) { @@ -573,6 +574,7 @@ vubr_new(const char *path, bool client) VHOST_USER_BRIDGE_MAX_QUEUES, dev->sock, vubr_panic, + NULL, vubr_set_watch, vubr_remove_watch, &vuiface)) { diff --git a/tools/virtiofsd/fuse_virtio.c b/tools/virtiofsd/fuse_virtio.c index d5c8e98253..1ea4b417e6 100644 --- a/tools/virtiofsd/fuse_virtio.c +++ b/tools/virtiofsd/fuse_virtio.c @@ -996,8 +996,8 @@ int virtio_session_mount(struct fuse_session *se) se->vu_socketfd =3D data_sock; se->virtio_dev->se =3D se; pthread_rwlock_init(&se->virtio_dev->vu_dispatch_rwlock, NULL); - vu_init(&se->virtio_dev->dev, 2, se->vu_socketfd, fv_panic, fv_set_wat= ch, - fv_remove_watch, &fv_iface); + vu_init(&se->virtio_dev->dev, 2, se->vu_socketfd, fv_panic, NULL, + fv_set_watch, fv_remove_watch, &fv_iface); =20 return 0; } --=20 2.26.2