https://bugzilla.kernel.org/show_bug.cgi?id=50891
Summary: The smp_affinity cannot work correctly when PCI
passthrough device using msi/msi-x with KVM
Product: Virtualization
Version: unspecified
Kernel Version: 3.7-rc6
Platform: All
OS/Version: Linux
Tree: Mainline
Status: NEW
Severity: normal
Priority: P1
Component: kvm
AssignedTo: [email protected]
ReportedBy: [email protected]
CC: [email protected]
Regression: No
1: passthrough a netcard (Brodcom BCM5716S) to the guest os
2: ifup the netcard, the card will use msi-x interrupt default, and close the
irqbalance service
3: echo 4 > cat /proc/irq/NETCARDIRQ/smp_affinity, so we assume the vcpu2
handle the irq.
4: we have set <vcpupin vcpu='2' cpuset='1'/> and set the irq kvm:pci-bus to
the pcpu1 on the host.
we think this configure will reduce the ipi interrupt when inject interrupt to
the guest os. but this irq is not only handle on vcpu2. it is not expect。
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