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From: Sean Christopherson <sean.j.christopherson@intel.com>
To: Vitaly Kuznetsov <vkuznets@redhat.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>,
	Wanpeng Li <wanpengli@tencent.com>,
	Jim Mattson <jmattson@google.com>, Joerg Roedel <joro@8bytes.org>,
	kvm@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 5/9] KVM: x86: Pull the PGD's level from the MMU instead of recalculating it
Date: Fri, 31 Jul 2020 09:14:19 -0700
Message-ID: <20200731161419.GB31451@linux.intel.com> (raw)
In-Reply-To: <871rl3pj9d.fsf@vitty.brq.redhat.com>

On Wed, Jul 22, 2020 at 07:11:26PM +0200, Vitaly Kuznetsov wrote:
> Sean Christopherson <sean.j.christopherson@intel.com> writes:
> > diff --git a/arch/x86/kvm/vmx/nested.c b/arch/x86/kvm/vmx/nested.c
> > index 4d561edf6f9ca..50b56622e16a6 100644
> > --- a/arch/x86/kvm/vmx/nested.c
> > +++ b/arch/x86/kvm/vmx/nested.c
> > @@ -2162,7 +2162,7 @@ static void prepare_vmcs02_constant_state(struct vcpu_vmx *vmx)
> >  	 * consistency checks.
> >  	 */
> >  	if (enable_ept && nested_early_check)
> > -		vmcs_write64(EPT_POINTER, construct_eptp(&vmx->vcpu, 0));
> > +		vmcs_write64(EPT_POINTER, construct_eptp(&vmx->vcpu, 0, 4));
> 
> Nit: could we use MMU's PT64_ROOT_4LEVEL instead of '4' here?

My strategy of procrastinating until Paolo queued the series paid off.

Short answer, yes, that could be done.  But to be consistent we'd want to
change vmx_get_max_tdp_level() and kvm_mmu_get_tdp_level() to also use
PT64_ROOT_4LEVEL and PT64_ROOT_5LEVEL, and for me at least that doesn't
improve readability.

  reply index

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-07-16  3:41 [PATCH 0/9] KVM: x86: TDP level cleanups and shadow NPT fix Sean Christopherson
2020-07-16  3:41 ` [PATCH 1/9] KVM: nSVM: Correctly set the shadow NPT root level in its MMU role Sean Christopherson
2020-07-22 17:02   ` Vitaly Kuznetsov
2020-07-16  3:41 ` [PATCH 2/9] KVM: x86/mmu: Add separate helper for shadow NPT root page role calc Sean Christopherson
2020-07-22 17:05   ` Vitaly Kuznetsov
2020-07-16  3:41 ` [PATCH 3/9] KVM: VMX: Drop a duplicate declaration of construct_eptp() Sean Christopherson
2020-07-16  3:41 ` [PATCH 4/9] KVM: VMX: Make vmx_load_mmu_pgd() static Sean Christopherson
2020-07-16  3:41 ` [PATCH 5/9] KVM: x86: Pull the PGD's level from the MMU instead of recalculating it Sean Christopherson
2020-07-22 17:11   ` Vitaly Kuznetsov
2020-07-31 16:14     ` Sean Christopherson [this message]
2020-07-16  3:41 ` [PATCH 6/9] KVM: VXM: Remove temporary WARN on expected vs. actual EPTP level mismatch Sean Christopherson
2020-07-16  3:41 ` [PATCH 7/9] KVM: x86: Dynamically calculate TDP level from max level and MAXPHYADDR Sean Christopherson
2020-07-16  3:41 ` [PATCH 8/9] KVM: x86/mmu: Rename max_page_level to max_huge_page_level Sean Christopherson
2020-07-16  3:41 ` [PATCH 9/9] KVM: x86: Specify max TDP level via kvm_configure_mmu() Sean Christopherson
2020-07-30 22:18 ` [PATCH 0/9] KVM: x86: TDP level cleanups and shadow NPT fix Paolo Bonzini

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