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Tsirkin" To: qemu-devel@nongnu.org Subject: [PULL 25/32] libvhost-user: handle NOFD flag in call/kick/err better Message-ID: <20200225151210.647797-26-mst@redhat.com> References: <20200225151210.647797-1-mst@redhat.com> MIME-Version: 1.0 In-Reply-To: <20200225151210.647797-1-mst@redhat.com> X-Mailer: git-send-email 2.24.1.751.gd10ce2899c X-Mutt-Fcc: =sent X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Transfer-Encoding: quoted-printable Content-Disposition: inline X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 205.139.110.61 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 , Stefan Hajnoczi , Gerd Hoffmann , Johannes Berg , =?utf-8?Q?Marc-Andr=C3=A9?= Lureau Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) Content-Type: text/plain; charset="utf-8" From: Johannes Berg The code here is odd, for example will it print out invalid file descriptor numbers that were never sent in the message. Clean that up a bit so it's actually possible to implement a device that uses polling. Signed-off-by: Johannes Berg Message-Id: <20200123081708.7817-5-johannes@sipsolutions.net> Reviewed-by: Michael S. Tsirkin Signed-off-by: Michael S. Tsirkin --- contrib/libvhost-user/libvhost-user.c | 24 ++++++++++++++++-------- 1 file changed, 16 insertions(+), 8 deletions(-) diff --git a/contrib/libvhost-user/libvhost-user.c b/contrib/libvhost-user/= libvhost-user.c index 533d55d82a..3abc9689e5 100644 --- a/contrib/libvhost-user/libvhost-user.c +++ b/contrib/libvhost-user/libvhost-user.c @@ -948,6 +948,7 @@ static bool vu_check_queue_msg_file(VuDev *dev, VhostUserMsg *vmsg) { int index =3D vmsg->payload.u64 & VHOST_USER_VRING_IDX_MASK; + bool nofd =3D vmsg->payload.u64 & VHOST_USER_VRING_NOFD_MASK; =20 if (index >=3D dev->max_queues) { vmsg_close_fds(vmsg); @@ -955,8 +956,12 @@ vu_check_queue_msg_file(VuDev *dev, VhostUserMsg *vmsg) return false; } =20 - if (vmsg->payload.u64 & VHOST_USER_VRING_NOFD_MASK || - vmsg->fd_num !=3D 1) { + if (nofd) { + vmsg_close_fds(vmsg); + return true; + } + + if (vmsg->fd_num !=3D 1) { vmsg_close_fds(vmsg); vu_panic(dev, "Invalid fds in request: %d", vmsg->request); return false; @@ -1053,6 +1058,7 @@ static bool vu_set_vring_kick_exec(VuDev *dev, VhostUserMsg *vmsg) { int index =3D vmsg->payload.u64 & VHOST_USER_VRING_IDX_MASK; + bool nofd =3D vmsg->payload.u64 & VHOST_USER_VRING_NOFD_MASK; =20 DPRINT("u64: 0x%016"PRIx64"\n", vmsg->payload.u64); =20 @@ -1066,8 +1072,8 @@ vu_set_vring_kick_exec(VuDev *dev, VhostUserMsg *vmsg) dev->vq[index].kick_fd =3D -1; } =20 - dev->vq[index].kick_fd =3D vmsg->fds[0]; - DPRINT("Got kick_fd: %d for vq: %d\n", vmsg->fds[0], index); + dev->vq[index].kick_fd =3D nofd ? -1 : vmsg->fds[0]; + DPRINT("Got kick_fd: %d for vq: %d\n", dev->vq[index].kick_fd, index); =20 dev->vq[index].started =3D true; if (dev->iface->queue_set_started) { @@ -1147,6 +1153,7 @@ static bool vu_set_vring_call_exec(VuDev *dev, VhostUserMsg *vmsg) { int index =3D vmsg->payload.u64 & VHOST_USER_VRING_IDX_MASK; + bool nofd =3D vmsg->payload.u64 & VHOST_USER_VRING_NOFD_MASK; =20 DPRINT("u64: 0x%016"PRIx64"\n", vmsg->payload.u64); =20 @@ -1159,14 +1166,14 @@ vu_set_vring_call_exec(VuDev *dev, VhostUserMsg *vm= sg) dev->vq[index].call_fd =3D -1; } =20 - dev->vq[index].call_fd =3D vmsg->fds[0]; + dev->vq[index].call_fd =3D nofd ? -1 : vmsg->fds[0]; =20 /* in case of I/O hang after reconnecting */ - if (eventfd_write(vmsg->fds[0], 1)) { + if (dev->vq[index].call_fd !=3D -1 && eventfd_write(vmsg->fds[0], 1)) { return -1; } =20 - DPRINT("Got call_fd: %d for vq: %d\n", vmsg->fds[0], index); + DPRINT("Got call_fd: %d for vq: %d\n", dev->vq[index].call_fd, index); =20 return false; } @@ -1175,6 +1182,7 @@ static bool vu_set_vring_err_exec(VuDev *dev, VhostUserMsg *vmsg) { int index =3D vmsg->payload.u64 & VHOST_USER_VRING_IDX_MASK; + bool nofd =3D vmsg->payload.u64 & VHOST_USER_VRING_NOFD_MASK; =20 DPRINT("u64: 0x%016"PRIx64"\n", vmsg->payload.u64); =20 @@ -1187,7 +1195,7 @@ vu_set_vring_err_exec(VuDev *dev, VhostUserMsg *vmsg) dev->vq[index].err_fd =3D -1; } =20 - dev->vq[index].err_fd =3D vmsg->fds[0]; + dev->vq[index].err_fd =3D nofd ? -1 : vmsg->fds[0]; =20 return false; } --=20 MST