On Wed, 06/28 19:47, Stefan Hajnoczi wrote:
> 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 <m...@redhat.com>
> Signed-off-by: Stefan Hajnoczi <stefa...@redhat.com>
> Reviewed-by: Michael S. Tsirkin <m...@redhat.com>
> Message-id: 20170615163813.7255-2-stefa...@redhat.com
> Signed-off-by: Stefan Hajnoczi <stefa...@redhat.com>
Reviewed-by: Fam Zheng <f...@redhat.com>
