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From: Paolo Bonzini <pbonzini@redhat.com>
To: Yu Zhang <yu.c.zhang@linux.intel.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 14:47:27 +0200	[thread overview]
Message-ID: <998dca9a-84b6-20ee-2646-3eb58df0b8a0@redhat.com> (raw)
In-Reply-To: <20210810110031.h7vaqf3nljwm3wym@linux.intel.com>

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.

Paolo


  reply	other threads:[~2021-08-10 12:47 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 [this message]
2021-08-10 14:37                       ` Yu Zhang
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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