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hw/virtio: enable common virtio feature for mmio device 

Both 'indirect_desc' and 'event_idx' are bus independent features,
and they should be enabled for mmio devices too.

On arm64 quad core VM(qemu-kvm), the patch can increase block I/O
performance a lot with latest linux tree:
        - without the patch: 14K IOPS
        - with the patch: 34K IOPS

fio script:
        [global]
        direct=1
        bsrange=4k-4k
        timeout=10
        numjobs=4
        ioengine=libaio
        iodepth=64

        filename=/dev/vdc
        group_reporting=1

        [f1]
        rw=randread

Cc: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Ming Lei <ming.lei@canonical.com>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Ming Lei 2014-06-04 10:05:55 +08:00 committed by Michael S. Tsirkin
parent 22dc50d758
commit b7c9285b8d
1 changed files with 6 additions and 0 deletions
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6
hw/virtio/virtio-mmio.c
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@ -369,10 +369,16 @@ static void virtio_mmio_realizefn(DeviceState *d, Error **errp)
sysbus_init_mmio(sbd, &proxy->iomem);
}
static Property virtio_mmio_properties[] = {
DEFINE_VIRTIO_COMMON_FEATURES(VirtIOMMIOProxy, host_features),
DEFINE_PROP_END_OF_LIST(),
};
static void virtio_mmio_class_init(ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
dc->props = virtio_mmio_properties;
dc->realize = virtio_mmio_realizefn;
dc->reset = virtio_mmio_reset;
set_bit(DEVICE_CATEGORY_MISC, dc->categories);