vdpa: add new attribute VDPA_ATTR_DEV_MIN_VQ_SIZE
This attribute advertises the min value of virtqueue size. The value is 1 by default. Signed-off-by: NWu Zongyong <wuzongyong@linux.alibaba.com> Link: https://lore.kernel.org/r/2bbc417355c4d22298050b1ba887cecfbde3e85d.1635493219.git.wuzongyong@linux.alibaba.comSigned-off-by: NMichael S. Tsirkin <mst@redhat.com>
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