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X-Received-From: 2607:f8b0:4003:c06::242 Subject: [Qemu-devel] [PATCH 45/99] tap: set vhostfd passed from qemu cli to non-blocking X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Jason Wang , Brijesh Singh , qemu-stable@nongnu.org, "Michael S . Tsirkin" Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) X-ZohoMail: RDKM_2 RSF_0 Z_629925259 SPT_0 Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" From: Brijesh Singh A guest boot hangs while probing the network interface when iommu_platform=3Don is used. The following qemu cli hangs without this patch: # $QEMU \ -netdev tap,fd=3D3,id=3Dhostnet0,vhost=3Don,vhostfd=3D4 3<>/dev/tap67 4<>= /dev/host-net \ -device virtio-net-pci,netdev=3Dhostnet0,id=3Dnet0,iommu_platform=3Don,di= sable-legacy=3Don \ ... Commit: c471ad0e9bd46 (vhost_net: device IOTLB support) took care of setting vhostfd to non-blocking when QEMU opens /dev/host-net but if the fd is passed from qemu cli then we need to ensure that fd is set to non-blocking. Fixes: c471ad0e9bd46 ("vhost_net: device IOTLB support") Cc: qemu-stable@nongnu.org Cc: Michael S. Tsirkin Cc: Jason Wang Signed-off-by: Brijesh Singh Signed-off-by: Jason Wang (cherry picked from commit d542800d1edc62f63f8a29cfa6bdd1a9536ae11c) Signed-off-by: Michael Roth --- net/tap.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/net/tap.c b/net/tap.c index 2b3a36f9b5..89c4e19162 100644 --- a/net/tap.c +++ b/net/tap.c @@ -40,6 +40,7 @@ #include "qemu-common.h" #include "qemu/cutils.h" #include "qemu/error-report.h" +#include "qemu/sockets.h" =20 #include "net/tap.h" =20 @@ -693,6 +694,7 @@ static void net_init_tap_one(const NetdevTapOptions *ta= p, NetClientState *peer, } return; } + qemu_set_nonblock(vhostfd); } else { vhostfd =3D open("/dev/vhost-net", O_RDWR); if (vhostfd < 0) { --=20 2.17.1