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Guest needs the ability to enable and disable MSI-X interrupts by setting the MSI-X control bit, for a passed-through device. Guest is allowed to write MSI-X mask bit only if Xen *thinks* that mask is clear (interrupts enabled). If the mask is set by Xen (interrupts disabled), writes to mask bit by the guest is ignored. Currently, a write to MSI-X mask bit by the guest is silently ignored. A

Hi All, We did some testing for Xen-unstable tree with upstream QEMU. We covered basic guest booting up, power management, VT-d, SR-IOV features. We found 4 new bugs which only exist in upstream QEMU not in qemu-xen. We followed the below wiki page to use upstream QEMU. http://wiki.xen.org/wiki/QEMU_Upstream test tree: xen-unstable-tree.hg: C/S 26193 (about 20 days ago) qemu.git: commit