linux-kernel - Re: [PATCH 15/18] KVM: MMU: Propagate the right fault back to the guest after gva_to

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Date:	Mon, 15 Mar 2010 04:30:47 +0000
From:	"Daniel K." <dk@...no>
To:	Joerg Roedel <joerg.roedel@....com>
CC:	Avi Kivity <avi@...hat.com>, Marcelo Tosatti <mtosatti@...hat.com>,
	Alexander Graf <agraf@...e.de>, kvm@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 15/18] KVM: MMU: Propagate the right fault back to the
 guest after gva_to_gpa

Joerg Roedel wrote:
> diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
> index 2883ce8..9f8b02d 100644
> --- a/arch/x86/kvm/x86.c
> +++ b/arch/x86/kvm/x86.c
> @@ -314,6 +314,19 @@ void kvm_inject_page_fault(struct kvm_vcpu *vcpu, unsigned long addr,
>  	kvm_queue_exception_e(vcpu, PF_VECTOR, error_code)
>  }
>  
> +void kvm_propagate_fault(struct kvm_vcpu *vcpu, unsigned long addr, u32 error_code)
> +{
> +	u32 nested, error;
> +
> +	nested = error_code &  PFERR_NESTED_MASK;
> +	error  = error_code & ~PFERR_NESTED_MASK;
> +
> +	if (vcpu->arch.mmu.nested && !(error_code && PFERR_NESTED_MASK))

This looks incorrect, nested is unused.

At the very least it should be a binary & operation

	if (vcpu->arch.mmu.nested && !(error_code & PFERR_NESTED_MASK))

which can be simplified to

	if (vcpu->arch.mmu.nested && !nested)

but it seems wrong that the condition is that it is nested and not nested 
at the same time.


> +		vcpu->arch.nested_mmu.inject_page_fault(vcpu, addr, error);
> +	else
> +		vcpu->arch.mmu.inject_page_fault(vcpu, addr, error);
> +}
> +
>  void kvm_inject_nmi(struct kvm_vcpu *vcpu)
>  {
>  	vcpu->arch.nmi_pending = 1;


Daniel K.
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