From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:48222) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1dQuOC-0008R4-8X for qemu-devel@nongnu.org; Fri, 30 Jun 2017 07:47:11 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1dQuOB-00052J-Gy for qemu-devel@nongnu.org; Fri, 30 Jun 2017 07:47:08 -0400 Received: from mx1.redhat.com ([209.132.183.28]:45448) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1dQuOB-00051u-Aq for qemu-devel@nongnu.org; Fri, 30 Jun 2017 07:47:07 -0400 From: Stefan Hajnoczi Date: Fri, 30 Jun 2017 12:46:35 +0100 Message-Id: <20170630114635.9286-8-stefanha@redhat.com> In-Reply-To: <20170630114635.9286-1-stefanha@redhat.com> References: <20170630114635.9286-1-stefanha@redhat.com> Subject: [Qemu-devel] [PULL 7/7] virtio-pci: use ioeventfd even when KVM is disabled List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org Cc: Peter Maydell , Stefan Hajnoczi , "Michael S . Tsirkin" Old kvm.ko versions only supported a tiny number of ioeventfds so virtio-pci avoids ioeventfds when kvm_has_many_ioeventfds() returns 0. Do not check kvm_has_many_ioeventfds() when KVM is disabled since it always returns 0. Since commit 8c56c1a592b5092d91da8d8943c17777d6462a6f ("memory: emulate ioeventfd") it has been possible to use ioeventfds in qtest or TCG mode. This patch makes -device virtio-blk-pci,iothread=iothread0 work even when KVM is disabled. I have tested that virtio-blk-pci works under TCG both with and without iothread. This patch fixes qemu-iotests 068, which was accidentally merged early despite the dependency on ioeventfd. Cc: Michael S. Tsirkin Signed-off-by: Stefan Hajnoczi Reviewed-by: Michael S. Tsirkin Reviewed-by: Fam Zheng Tested-by: Eric Blake Tested-by: Kevin Wolf Message-id: 20170628184724.21378-7-stefanha@redhat.com Message-id: 20170615163813.7255-2-stefanha@redhat.com Signed-off-by: Stefan Hajnoczi --- hw/virtio/virtio-pci.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/hw/virtio/virtio-pci.c b/hw/virtio/virtio-pci.c index 20d6a08..301920e 100644 --- a/hw/virtio/virtio-pci.c +++ b/hw/virtio/virtio-pci.c @@ -1740,7 +1740,7 @@ static void virtio_pci_realize(PCIDevice *pci_dev, Error **errp) bool pcie_port = pci_bus_is_express(pci_dev->bus) && !pci_bus_is_root(pci_dev->bus); - if (!kvm_has_many_ioeventfds()) { + if (kvm_enabled() && !kvm_has_many_ioeventfds()) { proxy->flags &= ~VIRTIO_PCI_FLAG_USE_IOEVENTFD; } -- 2.9.4