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bh=Go5qmUqyPVhLjJ+A7W/OFRJFVNMBRxbvYLjmjXBhUUo=; b=dDt9MElGp4Nvy1J3SOUFgxbUKmOc/pAIJ3gBVpXubRQnOGTSInz6SgAERUYSDxFXO9KdmU qjMzdOLpci/7QuVsZY9sSaFck1K/uXbky8+35i3HdJWrCsAuKnFfGv14qSrLmMY2vkXUuU Ae9Fzmcs2kEvOCTkgWSkTPjNpK+WCsA= X-MC-Unique: EsoIWbSdO1K3EDcob8FgWQ-1 From: Vivek Goyal To: qemu-devel@nongnu.org, virtio-fs@redhat.com Subject: [PATCH 2/6] libvhost-user: Use slave_mutex in all slave messages Date: Mon, 25 Jan 2021 13:01:11 -0500 Message-Id: <20210125180115.22936-3-vgoyal@redhat.com> In-Reply-To: <20210125180115.22936-1-vgoyal@redhat.com> References: <20210125180115.22936-1-vgoyal@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.13 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=vgoyal@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" dev->slave_mutex needs to be taken when sending messages on slave_fd. Currently _vu_queue_notify() does not do that. Introduce a helper vu_message_slave_send_receive() which sends as well as receive response. Use this helper in all the paths which send message on slave_fd channel. Signed-off-by: Vivek Goyal Reviewed-by: Greg Kurz --- subprojects/libvhost-user/libvhost-user.c | 50 ++++++++++++----------- 1 file changed, 27 insertions(+), 23 deletions(-) diff --git a/subprojects/libvhost-user/libvhost-user.c b/subprojects/libvho= st-user/libvhost-user.c index 4cf4aef63d..7a56c56dc8 100644 --- a/subprojects/libvhost-user/libvhost-user.c +++ b/subprojects/libvhost-user/libvhost-user.c @@ -403,7 +403,7 @@ vu_send_reply(VuDev *dev, int conn_fd, VhostUserMsg *vm= sg) * Processes a reply on the slave channel. * Entered with slave_mutex held and releases it before exit. * Returns true on success. - * *payload is written on success + * *payload is written on success, if payload is not NULL. */ static bool vu_process_message_reply(VuDev *dev, const VhostUserMsg *vmsg, @@ -427,7 +427,9 @@ vu_process_message_reply(VuDev *dev, const VhostUserMsg= *vmsg, goto out; } =20 - *payload =3D msg_reply.payload.u64; + if (payload) { + *payload =3D msg_reply.payload.u64; + } result =3D true; =20 out: @@ -435,6 +437,25 @@ out: return result; } =20 +/* Returns true on success, false otherwise */ +static bool +vu_message_slave_send_receive(VuDev *dev, VhostUserMsg *vmsg, uint64_t *pa= yload) +{ + pthread_mutex_lock(&dev->slave_mutex); + if (!vu_message_write(dev, dev->slave_fd, vmsg)) { + pthread_mutex_unlock(&dev->slave_mutex); + return false; + } + + if ((vmsg->flags & VHOST_USER_NEED_REPLY_MASK) =3D=3D 0) { + pthread_mutex_unlock(&dev->slave_mutex); + return true; + } + + /* Also unlocks the slave_mutex */ + return vu_process_message_reply(dev, vmsg, payload); +} + /* Kick the log_call_fd if required. */ static void vu_log_kick(VuDev *dev) @@ -1340,16 +1361,8 @@ bool vu_set_queue_host_notifier(VuDev *dev, VuVirtq = *vq, int fd, return false; } =20 - pthread_mutex_lock(&dev->slave_mutex); - if (!vu_message_write(dev, dev->slave_fd, &vmsg)) { - pthread_mutex_unlock(&dev->slave_mutex); - return false; - } - - /* Also unlocks the slave_mutex */ - res =3D vu_process_message_reply(dev, &vmsg, &payload); + res =3D vu_message_slave_send_receive(dev, &vmsg, &payload); res =3D res && (payload =3D=3D 0); - return res; } =20 @@ -2395,10 +2408,7 @@ static void _vu_queue_notify(VuDev *dev, VuVirtq *vq= , bool sync) vmsg.flags |=3D VHOST_USER_NEED_REPLY_MASK; } =20 - vu_message_write(dev, dev->slave_fd, &vmsg); - if (ack) { - vu_message_read_default(dev, dev->slave_fd, &vmsg); - } + vu_message_slave_send_receive(dev, &vmsg, NULL); return; } =20 @@ -2942,17 +2952,11 @@ int64_t vu_fs_cache_request(VuDev *dev, VhostUserSl= aveRequest req, int fd, return -EINVAL; } =20 - pthread_mutex_lock(&dev->slave_mutex); - if (!vu_message_write(dev, dev->slave_fd, &vmsg)) { - pthread_mutex_unlock(&dev->slave_mutex); - return -EIO; - } - - /* Also unlocks the slave_mutex */ - res =3D vu_process_message_reply(dev, &vmsg, &payload); + res =3D vu_message_slave_send_receive(dev, &vmsg, &payload); if (!res) { return -EIO; } + /* * Payload is delivered as uint64_t but is actually signed for * errors. --=20 2.25.4