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Subject: Re: [RFC PATCH v2 20/69] KVM: x86/mmu: Mark VM as bugged if page
 fault returns RET_PF_INVALID
To:     isaku.yamahata@intel.com, Thomas Gleixner <tglx@linutronix.de>,
        Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
        "H . Peter Anvin" <hpa@zytor.com>,
        Vitaly Kuznetsov <vkuznets@redhat.com>,
        Wanpeng Li <wanpengli@tencent.com>,
        Jim Mattson <jmattson@google.com>,
        Joerg Roedel <joro@8bytes.org>, erdemaktas@google.com,
        Connor Kuehl <ckuehl@redhat.com>,
        Sean Christopherson <seanjc@google.com>, x86@kernel.org,
        linux-kernel@vger.kernel.org, kvm@vger.kernel.org
Cc:     isaku.yamahata@gmail.com,
        Sean Christopherson <sean.j.christopherson@intel.com>
References: <cover.1625186503.git.isaku.yamahata@intel.com>
 <298980aa5fc5707184ac082287d13a800cd9c25f.1625186503.git.isaku.yamahata@intel.com>
From:   Paolo Bonzini <pbonzini@redhat.com>
Message-ID: <a5337d79-8503-0343-11d8-207bd929b2ff@redhat.com>
Date:   Tue, 6 Jul 2021 15:48:13 +0200
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On 03/07/21 00:04, isaku.yamahata@intel.com wrote:
> From: Sean Christopherson <sean.j.christopherson@intel.com>
> 
> Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
> Signed-off-by: Isaku Yamahata <isaku.yamahata@intel.com>
> ---
>   arch/x86/kvm/mmu/mmu.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/arch/x86/kvm/mmu/mmu.c b/arch/x86/kvm/mmu/mmu.c
> index 5b8a640f8042..0dc4bf34ce9c 100644
> --- a/arch/x86/kvm/mmu/mmu.c
> +++ b/arch/x86/kvm/mmu/mmu.c
> @@ -5091,7 +5091,7 @@ int kvm_mmu_page_fault(struct kvm_vcpu *vcpu, gpa_t cr2_or_gpa, u64 error_code,
>   	if (r == RET_PF_INVALID) {
>   		r = kvm_mmu_do_page_fault(vcpu, cr2_or_gpa,
>   					  lower_32_bits(error_code), false);
> -		if (WARN_ON_ONCE(r == RET_PF_INVALID))
> +		if (KVM_BUG_ON(r == RET_PF_INVALID, vcpu->kvm))
>   			return -EIO;
>   	}
>   
> 

Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>