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SubjectRe: [PATCH v3 5/6] KVM: X86: Add NMI support to PV IPIs
2018-07-03 14:21+0800, Wanpeng Li:
> From: Wanpeng Li <wanpengli@tencent.com>
>
> The NMI delivery mode of ICR is used to deliver an NMI to the processor,
> and the vector information is ignored.
>
> Cc: Paolo Bonzini <pbonzini@redhat.com>
> Cc: Radim Krčmář <rkrcmar@redhat.com>
> Cc: Vitaly Kuznetsov <vkuznets@redhat.com>
> Signed-off-by: Wanpeng Li <wanpengli@tencent.com>
> ---
> diff --git a/arch/x86/kernel/kvm.c b/arch/x86/kernel/kvm.c
> @@ -479,7 +479,16 @@ static int __send_ipi_mask(const struct cpumask *mask, int vector)
> }
> }
>
> - ret = kvm_hypercall3(KVM_HC_SEND_IPI, ipi_bitmap_low, ipi_bitmap_high, vector);
> + switch (vector) {
> + default:
> + icr = APIC_DM_FIXED | vector;
> + break;
> + case NMI_VECTOR:
> + icr = APIC_DM_NMI;

I think it would be better to say that KVM interprets NMI_VECTOR and
sends the interrupt as APIC_DM_NMI.

> + break;
> + }
> +
> + ret = kvm_hypercall3(KVM_HC_SEND_IPI, ipi_bitmap_low, ipi_bitmap_high, icr);
>

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