linux-kernel - Re: [PATCH v2 10/21] KVM: VMX: Inject #PF on ENCLS as "emulated" #PF

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Date:   Wed, 06 Jul 2022 15:00:49 +0300
From:   Maxim Levitsky <mlevitsk@...hat.com>
To:     Sean Christopherson <seanjc@...gle.com>,
        Paolo Bonzini <pbonzini@...hat.com>
Cc:     Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Joerg Roedel <joro@...tes.org>, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org, Oliver Upton <oupton@...gle.com>,
        Peter Shier <pshier@...gle.com>
Subject: Re: [PATCH v2 10/21] KVM: VMX: Inject #PF on ENCLS as "emulated" #PF

On Tue, 2022-06-14 at 20:47 +0000, Sean Christopherson wrote:
> Treat #PFs that occur during emulation of ENCLS as, wait for it, emulated
> page faults.  Practically speaking, this is a glorified nop as the
> exception is never of the nested flavor, and it's extremely unlikely the
> guest is relying on the side effect of an implicit INVLPG on the faulting
> address.
> 
> Fixes: 70210c044b4e ("KVM: VMX: Add SGX ENCLS[ECREATE] handler to enforce CPUID restrictions")
> Signed-off-by: Sean Christopherson <seanjc@...gle.com>
> ---
>  arch/x86/kvm/vmx/sgx.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/arch/x86/kvm/vmx/sgx.c b/arch/x86/kvm/vmx/sgx.c
> index 35e7ec91ae86..966cfa228f2a 100644
> --- a/arch/x86/kvm/vmx/sgx.c
> +++ b/arch/x86/kvm/vmx/sgx.c
> @@ -129,7 +129,7 @@ static int sgx_inject_fault(struct kvm_vcpu *vcpu, gva_t gva, int trapnr)
>  		ex.address = gva;
>  		ex.error_code_valid = true;
>  		ex.nested_page_fault = false;
> -		kvm_inject_page_fault(vcpu, &ex);
> +		kvm_inject_emulated_page_fault(vcpu, &ex);
>  	} else {
>  		kvm_inject_gp(vcpu, 0);
>  	}

Reviewed-by: Maxim Levitsky <mlevitsk@...hat.com>

Best regards,
	Maxim Levitsky