From: Yu Zhang <yu.c.zhang@linux.intel.com>
To: Paolo Bonzini <pbonzini@redhat.com>
Cc: Sean Christopherson <seanjc@google.com>,
Wei Huang <wei.huang2@amd.com>,
kvm@vger.kernel.org, linux-kernel@vger.kernel.org,
vkuznets@redhat.com, wanpengli@tencent.com, jmattson@google.com,
joro@8bytes.org, tglx@linutronix.de, mingo@redhat.com,
bp@alien8.de, x86@kernel.org, hpa@zytor.com
Subject: Re: [PATCH v2 1/3] KVM: x86: Allow CPU to force vendor-specific TDP level
Date: Tue, 10 Aug 2021 22:37:16 +0800 [thread overview]
Message-ID: <20210810143716.daz5p3mf5bbeyp74@linux.intel.com> (raw)
In-Reply-To: <998dca9a-84b6-20ee-2646-3eb58df0b8a0@redhat.com>
On Tue, Aug 10, 2021 at 02:47:27PM +0200, Paolo Bonzini wrote:
> On 10/08/21 13:00, Yu Zhang wrote:
> > I guess it's because, unlike EPT which are with either 4 or 5 levels, NPT's
> > level can range from 2 to 5, depending on the host paging mode...
>
> Yes, on Linux that will be one of 3/4/5 based on host paging mode, and it
> will apply to all N_CR3...
>
> > But shadow EPT does not have such annoyance. Is above understanding correct?
>
> ... Right, because shadow EPT cannot have less than 4 levels, and it can
> always use 4 levels if that's what L1 uses.
Interesting. :) Thanks a lot for the explanation!
B.R.
Yu
next prev parent reply other threads:[~2021-08-10 14:37 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-08-08 19:26 [PATCH v2 0/3] SVM 5-level page table support Wei Huang
2021-08-08 19:26 ` [PATCH v2 1/3] KVM: x86: Allow CPU to force vendor-specific TDP level Wei Huang
2021-08-09 3:58 ` Yu Zhang
2021-08-09 4:11 ` Wei Huang
2021-08-09 4:27 ` Yu Zhang
2021-08-09 4:33 ` Wei Huang
2021-08-09 6:42 ` Yu Zhang
2021-08-09 15:30 ` Sean Christopherson
2021-08-09 21:49 ` Jim Mattson
2021-08-10 9:23 ` Paolo Bonzini
2021-08-10 7:40 ` Yu Zhang
2021-08-10 9:25 ` Paolo Bonzini
2021-08-10 11:00 ` Yu Zhang
2021-08-10 12:47 ` Paolo Bonzini
2021-08-10 14:37 ` Yu Zhang [this message]
2021-08-08 19:26 ` [PATCH v2 2/3] KVM: x86: Handle the case of 5-level shadow page table Wei Huang
2021-08-09 15:17 ` Sean Christopherson
2021-08-09 17:03 ` Wei Huang
2021-08-08 19:26 ` [PATCH v2 3/3] KVM: SVM: Add 5-level page table support for SVM Wei Huang
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