virtio-pci: use ioeventfd even when KVM is disabled
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 8c56c1a592
("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 <mst@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Fam Zheng <famz@redhat.com>
Tested-by: Eric Blake <eblake@redhat.com>
Tested-by: Kevin Wolf <kwolf@redhat.com>
Message-id: 20170628184724.21378-7-stefanha@redhat.com
Message-id: 20170615163813.7255-2-stefanha@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
parent
8e11c9d365
commit
c324fd0a39
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@ -1740,7 +1740,7 @@ static void virtio_pci_realize(PCIDevice *pci_dev, Error **errp)
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bool pcie_port = pci_bus_is_express(pci_dev->bus) &&
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!pci_bus_is_root(pci_dev->bus);
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if (!kvm_has_many_ioeventfds()) {
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if (kvm_enabled() && !kvm_has_many_ioeventfds()) {
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proxy->flags &= ~VIRTIO_PCI_FLAG_USE_IOEVENTFD;
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}
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