Re: [RFC PATCH v1 10/15] KVM: VMX: Use WRMSRNS or its immediate form when available

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To: "H. Peter Anvin" <hpa@xxxxxxxxx>, Jim Mattson <jmattson@xxxxxxxxxx>, Sean Christopherson <seanjc@xxxxxxxxxx>
Subject: Re: [RFC PATCH v1 10/15] KVM: VMX: Use WRMSRNS or its immediate form when available
From: Xin Li <xin@xxxxxxxxx>
Date: Tue, 15 Apr 2025 10:06:01 -0700
Cc: linux-kernel@xxxxxxxxxxxxxxx, linux-perf-users@xxxxxxxxxxxxxxx, linux-hyperv@xxxxxxxxxxxxxxx, virtualization@xxxxxxxxxxxxxxx, linux-edac@xxxxxxxxxxxxxxx, kvm@xxxxxxxxxxxxxxx, xen-devel@xxxxxxxxxxxxxxxxxxxx, linux-ide@xxxxxxxxxxxxxxx, linux-pm@xxxxxxxxxxxxxxx, bpf@xxxxxxxxxxxxxxx, llvm@xxxxxxxxxxxxxxx, tglx@xxxxxxxxxxxxx, mingo@xxxxxxxxxx, bp@xxxxxxxxx, dave.hansen@xxxxxxxxxxxxxxx, x86@xxxxxxxxxx, jgross@xxxxxxxx, andrew.cooper3@xxxxxxxxxx, peterz@xxxxxxxxxxxxx, acme@xxxxxxxxxx, namhyung@xxxxxxxxxx, mark.rutland@xxxxxxx, alexander.shishkin@xxxxxxxxxxxxxxx, jolsa@xxxxxxxxxx, irogers@xxxxxxxxxx, adrian.hunter@xxxxxxxxx, kan.liang@xxxxxxxxxxxxxxx, wei.liu@xxxxxxxxxx, ajay.kaher@xxxxxxxxxxxx, bcm-kernel-feedback-list@xxxxxxxxxxxx, tony.luck@xxxxxxxxx, pbonzini@xxxxxxxxxx, vkuznets@xxxxxxxxxx, luto@xxxxxxxxxx, boris.ostrovsky@xxxxxxxxxx, kys@xxxxxxxxxxxxx, haiyangz@xxxxxxxxxxxxx, decui@xxxxxxxxxxxxx
In-reply-to: <D212FABE-38FE-45D3-A082-CA819CCFFF95@zytor.com>
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On 4/14/2025 11:56 PM, H. Peter Anvin wrote:

arlier in the pipeline, right?

Yes, but then it would be redundant with the virtualization support.


So better to drop this patch then.

Follow-Ups:
- Re: [RFC PATCH v1 10/15] KVM: VMX: Use WRMSRNS or its immediate form when available
  - From: H. Peter Anvin

References:
- [RFC PATCH v1 00/15] MSR refactor with new MSR instructions support
  - From: Xin Li (Intel)
- [RFC PATCH v1 10/15] KVM: VMX: Use WRMSRNS or its immediate form when available
  - From: Xin Li (Intel)
- Re: [RFC PATCH v1 10/15] KVM: VMX: Use WRMSRNS or its immediate form when available
  - From: Sean Christopherson
- Re: [RFC PATCH v1 10/15] KVM: VMX: Use WRMSRNS or its immediate form when available
  - From: Jim Mattson
- Re: [RFC PATCH v1 10/15] KVM: VMX: Use WRMSRNS or its immediate form when available
  - From: Xin Li
- Re: [RFC PATCH v1 10/15] KVM: VMX: Use WRMSRNS or its immediate form when available
  - From: H. Peter Anvin
- Re: [RFC PATCH v1 10/15] KVM: VMX: Use WRMSRNS or its immediate form when available
  - From: Xin Li
- Re: [RFC PATCH v1 10/15] KVM: VMX: Use WRMSRNS or its immediate form when available
  - From: H. Peter Anvin

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