[Bug 50891] The smp_affinity cannot work correctly on guest os when PCI passthrough device using msi/msi-x with KVM

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https://bugzilla.kernel.org/show_bug.cgi?id=50891





--- Comment #3 from Alex Williamson <alex.williamson@redhat.com>  2012-11-27 18:13:07 ---
I tested a BCM5716 on 3.7.0-rc7 with both qemu-kvm-1.2.0 and current qemu.git
using pci-assign.  MSI-X pinning works exactly as expected.  Note that Linux
MSI affinity is setup lazily on the next interrupt for a vector, so it's normal
that after setting the affinity for a vector that you might see a single
interrupt on another CPU before the interrupt is moved.  Also note that setting
the affinity in the guest only changes the affinity of the virtual interrupt to
the guest, the physical interrupt affinity must be separately configured on the
host.  Perhaps the steps your missing in comment 0 above is to disable
irqbalance in the host and set the irq affinity of the kvm interrupts in the
host.

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