[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 #5 from Alex Williamson <alex.williamson@redhat.com>  2012-11-29 16:10:55 ---
(In reply to comment #4)
> 1: i have disable the irqbalance in the host, and the irq affinity on the host
> is ok.you can see the  4 step in  comment 0.
> 
> 2: you see in comment 0, we have set irq affinity on the host is pcpu1.
> and so reduce the ipi interrupt, so we want to set the irq affinity at the
> vcpu2 on the guest os according <vcpupin vcpu='2' cpuset='1'/>, but the irq
> affinity on the guest os when using msi-x is failed.

How does it fail?  When I test this, I look at /proc/interrupts on the guest
and the interrupt count on the row with the pinned IRQ only increases in the
column under the target CPU.  Perhaps if you included some logs and exact
commands used I could better understand where things are going wrong.  Thanks.

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