linux-kernel - Re: [PATCH v3 11/11] KVM: X86: Use common code for PV IPIs in linux guest

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Date: Sat, 29 Jun 2024 11:38:10 -0700
From: Xin Li <xin@...or.com>
To: Jacob Pan <jacob.jun.pan@...ux.intel.com>, X86 Kernel <x86@...nel.org>,
        Sean Christopherson <seanjc@...gle.com>,
        LKML
 <linux-kernel@...r.kernel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Dave Hansen <dave.hansen@...el.com>, "H. Peter Anvin" <hpa@...or.com>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Xin Li <xin3.li@...el.com>, linux-perf-users@...r.kernel.org,
        Peter Zijlstra <peterz@...radead.org>
Cc: Paolo Bonzini <pbonzini@...hat.com>, Tony Luck <tony.luck@...el.com>,
        Andy Lutomirski <luto@...nel.org>, acme@...nel.org,
        kan.liang@...ux.intel.com, Andi Kleen <andi.kleen@...el.com>,
        "Mehta, Sohil" <sohil.mehta@...el.com>,
        Zeng Guang <guang.zeng@...el.com>
Subject: Re: [PATCH v3 11/11] KVM: X86: Use common code for PV IPIs in linux
 guest

On 6/28/2024 1:18 PM, Jacob Pan wrote:
> Paravirtual apic hooks to enable PV IPIs for KVM if the "send IPI"

s/Paravirtual apic/Paravirtualize APIC/

> hypercall is available. Reuse common code for ICR preparation which
> covers NMI-source reporting if in effect.

I see a lot of "NMI source". Should we use "NMI-source" in all places?

> 
> Originally-by: Zeng Guang <guang.zeng@...el.com>
> Signed-off-by: Jacob Pan <jacob.jun.pan@...ux.intel.com>
> ---
>   arch/x86/kernel/kvm.c | 10 +---------
>   1 file changed, 1 insertion(+), 9 deletions(-)
> 
> diff --git a/arch/x86/kernel/kvm.c b/arch/x86/kernel/kvm.c
> index 263f8aed4e2c..a45d60aa0302 100644
> --- a/arch/x86/kernel/kvm.c
> +++ b/arch/x86/kernel/kvm.c
> @@ -516,15 +516,7 @@ static void __send_ipi_mask(const struct cpumask *mask, int vector)
>   
>   	local_irq_save(flags);
>   
> -	switch (vector) {
> -	default:
> -		icr = APIC_DM_FIXED | vector;
> -		break;
> -	case NMI_VECTOR:
> -		icr = APIC_DM_NMI;
> -		break;
> -	}
> -
> +	icr = __prepare_ICR(0, vector, 0);
>   	for_each_cpu(cpu, mask) {
>   		apic_id = per_cpu(x86_cpu_to_apicid, cpu);
>   		if (!ipi_bitmap) {