linux-kernel - Re: [PATCH 3/7] kvm: x86/mmu: Use kvm_mmu_invalidate_gva() in nested_ept_invalidate

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Message-ID: <Y9sQXwQwQxi2Dcr8@google.com>
Date:   Thu, 2 Feb 2023 01:22:39 +0000
From:   Sean Christopherson <seanjc@...gle.com>
To:     Lai Jiangshan <jiangshanlai@...il.com>
Cc:     linux-kernel@...r.kernel.org, Paolo Bonzini <pbonzini@...hat.com>,
        Lai Jiangshan <jiangshan.ljs@...group.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org,
        "H. Peter Anvin" <hpa@...or.com>, kvm@...r.kernel.org
Subject: Re: [PATCH 3/7] kvm: x86/mmu: Use kvm_mmu_invalidate_gva() in
 nested_ept_invalidate_addr()

On Thu, Jan 05, 2023, Lai Jiangshan wrote:
> From: Lai Jiangshan <jiangshan.ljs@...group.com>
> 
> Use kvm_mmu_invalidate_gva() instead open calls to mmu->invlpg().
> 
> No functional change intended.
> 
> Signed-off-by: Lai Jiangshan <jiangshan.ljs@...group.com>
> ---
>  arch/x86/kvm/mmu/mmu.c    | 1 +
>  arch/x86/kvm/vmx/nested.c | 5 ++++-
>  2 files changed, 5 insertions(+), 1 deletion(-)
> 
> diff --git a/arch/x86/kvm/mmu/mmu.c b/arch/x86/kvm/mmu/mmu.c
> index b0e7ac6d4e88..ffef9fe0c853 100644
> --- a/arch/x86/kvm/mmu/mmu.c
> +++ b/arch/x86/kvm/mmu/mmu.c
> @@ -5719,6 +5719,7 @@ void kvm_mmu_invalidate_gva(struct kvm_vcpu *vcpu, struct kvm_mmu *mmu,
>  		    VALID_PAGE(mmu->prev_roots[i].hpa))
>  			mmu->invlpg(vcpu, gva, mmu->prev_roots[i].hpa);
>  }
> +EXPORT_SYMBOL_GPL(kvm_mmu_invalidate_gva);
>  
>  void kvm_mmu_invlpg(struct kvm_vcpu *vcpu, gva_t gva)
>  {
> diff --git a/arch/x86/kvm/vmx/nested.c b/arch/x86/kvm/vmx/nested.c
> index 557b9c468734..daf3138bafd1 100644
> --- a/arch/x86/kvm/vmx/nested.c
> +++ b/arch/x86/kvm/vmx/nested.c
> @@ -358,6 +358,7 @@ static bool nested_ept_root_matches(hpa_t root_hpa, u64 root_eptp, u64 eptp)
>  static void nested_ept_invalidate_addr(struct kvm_vcpu *vcpu, gpa_t eptp,
>  				       gpa_t addr)
>  {
> +	ulong roots_to_invalidate = 0;

Same thing here.