Re: [RFC PATCH 5/8] KVM: x86/mmu: Introduce kvm_mmu_map_page() for prepopulating guest memory

From: David Matlack <dmatlack@google.com>
To: isaku.yamahata@intel.com
Cc: kvm@vger.kernel.org, isaku.yamahata@gmail.com,
	linux-kernel@vger.kernel.org,
	Sean Christopherson <seanjc@google.com>,
	Paolo Bonzini <pbonzini@redhat.com>,
	Michael Roth <michael.roth@amd.com>,
	Federico Parola <federico.parola@polito.it>
Subject: Re: [RFC PATCH 5/8] KVM: x86/mmu: Introduce kvm_mmu_map_page() for prepopulating guest memory
Date: Wed, 6 Mar 2024 16:38:53 -0800	[thread overview]
Message-ID: <ZekMnStRy1WwF2eb@google.com> (raw)
In-Reply-To: <7b7dd4d56249028aa0b84d439ffdf1b79e67322a.1709288671.git.isaku.yamahata@intel.com>

On 2024-03-01 09:28 AM, isaku.yamahata@intel.com wrote:
> diff --git a/arch/x86/kvm/mmu/mmu.c b/arch/x86/kvm/mmu/mmu.c
> index e4cc7f764980..7d5e80d17977 100644
> --- a/arch/x86/kvm/mmu/mmu.c
> +++ b/arch/x86/kvm/mmu/mmu.c
> @@ -4659,6 +4659,36 @@ int kvm_tdp_page_fault(struct kvm_vcpu *vcpu, struct kvm_page_fault *fault)
>  	return direct_page_fault(vcpu, fault);
>  }
>  
> +int kvm_mmu_map_page(struct kvm_vcpu *vcpu, gpa_t gpa, u32 error_code,
> +		     u8 max_level, u8 *goal_level)
> +{
> +	struct kvm_page_fault fault = KVM_PAGE_FAULT_INIT(vcpu, gpa, error_code,
> +							  false, max_level);
> +	int r;
> +
> +	r = __kvm_mmu_do_page_fault(vcpu, &fault);

If TDP is disabled __kvm_mmu_do_page_fault() will interpret @gpa as a
GVA no? And if the vCPU is in guest-mode __kvm_mmu_do_page_fault() will
interpret gpa as a nGPA right?