From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:48317) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1dLXms-000138-8g for qemu-devel@nongnu.org; Thu, 15 Jun 2017 12:38:27 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1dLXmr-000202-Ef for qemu-devel@nongnu.org; Thu, 15 Jun 2017 12:38:26 -0400 Received: from mx1.redhat.com ([209.132.183.28]:37944) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1dLXmr-0001zL-88 for qemu-devel@nongnu.org; Thu, 15 Jun 2017 12:38:25 -0400 From: Stefan Hajnoczi Date: Thu, 15 Jun 2017 17:38:09 +0100 Message-Id: <20170615163813.7255-2-stefanha@redhat.com> In-Reply-To: <20170615163813.7255-1-stefanha@redhat.com> References: <20170615163813.7255-1-stefanha@redhat.com> Subject: [Qemu-devel] [PATCH 1/5] 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: Kevin Wolf , Pavel Butsykin , 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. Cc: Michael S. Tsirkin 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 f9b7244..9f55476 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