linux-kernel - Re: [PATCH v2 3/3] KVM: X86: Let's harden the ipi fastpath condition edge-trigger mode

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Date:   Tue, 8 Jun 2021 18:27:35 +0200
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Wanpeng Li <kernellwp@...il.com>, linux-kernel@...r.kernel.org,
        kvm@...r.kernel.org
Cc:     Sean Christopherson <seanjc@...gle.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Joerg Roedel <joro@...tes.org>
Subject: Re: [PATCH v2 3/3] KVM: X86: Let's harden the ipi fastpath condition
 edge-trigger mode

On 07/06/21 09:19, Wanpeng Li wrote:
> From: Wanpeng Li <wanpengli@...cent.com>
> 
> Let's harden the ipi fastpath condition edge-trigger mode.

This is not a good commit message...  And if it's a bug, it needs a 
kvm-unit-tests testcase.

Paolo

> Signed-off-by: Wanpeng Li <wanpengli@...cent.com>
> ---
>   arch/x86/kvm/x86.c | 1 +
>   1 file changed, 1 insertion(+)
> 
> diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
> index b594275..dbd3e9d 100644
> --- a/arch/x86/kvm/x86.c
> +++ b/arch/x86/kvm/x86.c
> @@ -1922,6 +1922,7 @@ static int handle_fastpath_set_x2apic_icr_irqoff(struct kvm_vcpu *vcpu, u64 data
>   		return 1;
>   
>   	if (((data & APIC_SHORT_MASK) == APIC_DEST_NOSHORT) &&
> +		((data & APIC_INT_LEVELTRIG) == 0) &&
>   		((data & APIC_DEST_MASK) == APIC_DEST_PHYSICAL) &&
>   		((data & APIC_MODE_MASK) == APIC_DM_FIXED) &&
>   		((u32)(data >> 32) != X2APIC_BROADCAST)) {
>