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SubjectRe: [PATCH 1/5] KVM: x86: avoid atomic operations on APICv vmentry
From
Date
> 
> diff --git a/arch/x86/kvm/lapic.c b/arch/x86/kvm/lapic.c
> index 23b99f305382..63a442aefc12 100644
> --- a/arch/x86/kvm/lapic.c
> +++ b/arch/x86/kvm/lapic.c
> @@ -342,9 +342,11 @@ void __kvm_apic_update_irr(u32 *pir, void *regs)
> u32 i, pir_val;
>
> for (i = 0; i <= 7; i++) {
> - pir_val = xchg(&pir[i], 0);
> - if (pir_val)
> + pir_val = READ_ONCE(pir[i]);

Out of curiosity, do you really need this READ_ONCE?

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