答复: [PATCH v2] KVM: X86: Introduce vfio_intr_stat per-vm debugfs file

[Li,Rongqing]

> 主题: [PATCH v2] KVM: X86: Introduce vfio_intr_stat per-vm debugfs file
> 
> Use this file to export correspondence between guest_irq, host_irq, vector and
> vcpu belonging to VFIO passthrough devices.
> 
> An example output of this looks like (a vm with VFIO passthrough
> devices):
>    guest_irq     host_irq       vector         vcpu
>           24          201           37            8
>           25          202           35           25
>           26          203           35           20
>    ......
> 
> When a VM has VFIO passthrough devices, the correspondence between
> guest_irq, host_irq, vector and vcpu may need to be known especially in AMD
> platform with avic disabled. The AMD avic is disabled, and the passthrough
> devices may cause vcpu vm exit twice for a interrupt.
> One extrernal interrupt caused by vfio host irq, other ipi to inject a interrupt to
> vm.
> 
> If the system administrator known these information, set vfio host irq affinity to
> Pcpu which the correspondece guest irq affinited vcpu, to avoid extra vm exit.
> 
> Co-developed-by: Li RongQing <lirongqing@xxxxxxxxx>
> Signed-off-by: Li RongQing <lirongqing@xxxxxxxxx>
> Signed-off-by: Yuan ZhaoXiong <yuanzhaoxiong@xxxxxxxxx>
> ---

Ping

Thanks

-Li