Re: [RFC PATCH v2 06/34] x86/msr: Use the alternatives mechanism to read PMC

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To: Juergen Gross <jgross@xxxxxxxx>, linux-kernel@xxxxxxxxxxxxxxx, kvm@xxxxxxxxxxxxxxx, linux-perf-users@xxxxxxxxxxxxxxx, linux-hyperv@xxxxxxxxxxxxxxx, virtualization@xxxxxxxxxxxxxxx, linux-pm@xxxxxxxxxxxxxxx, linux-edac@xxxxxxxxxxxxxxx, xen-devel@xxxxxxxxxxxxxxxxxxxx, linux-acpi@xxxxxxxxxxxxxxx, linux-hwmon@xxxxxxxxxxxxxxx, netdev@xxxxxxxxxxxxxxx, platform-driver-x86@xxxxxxxxxxxxxxx
Subject: Re: [RFC PATCH v2 06/34] x86/msr: Use the alternatives mechanism to read PMC
From: Xin Li <xin@xxxxxxxxx>
Date: Wed, 23 Apr 2025 00:40:40 -0700
Cc: tglx@xxxxxxxxxxxxx, mingo@xxxxxxxxxx, bp@xxxxxxxxx, dave.hansen@xxxxxxxxxxxxxxx, x86@xxxxxxxxxx, hpa@xxxxxxxxx, acme@xxxxxxxxxx, andrew.cooper3@xxxxxxxxxx, peterz@xxxxxxxxxxxxx, 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, seanjc@xxxxxxxxxx, luto@xxxxxxxxxx, boris.ostrovsky@xxxxxxxxxx, kys@xxxxxxxxxxxxx, haiyangz@xxxxxxxxxxxxx, decui@xxxxxxxxxxxxx
In-reply-to: <bfeba521-0a49-42d0-bf83-15d031dfc6da@suse.com>
References: <20250422082216.1954310-1-xin@zytor.com> <20250422082216.1954310-7-xin@zytor.com> <fbb509e8-0bd6-480f-be32-fd0895255a21@suse.com> <a482b4df-f662-4d5d-8100-ade07afcdc24@zytor.com> <bfeba521-0a49-42d0-bf83-15d031dfc6da@suse.com>
User-agent: Mozilla Thunderbird

On 4/22/2025 2:28 AM, Juergen Gross wrote:


I have worked rather hard to make it less intrusive, especially by removing
the paravirt specific code patching (now all done via alternative patching)
and by removing 32-bit Xen PV mode.


I looked at the optimization, and it is a nice improvement.

References:
- [RFC PATCH v2 00/34] MSR refactor with new MSR instructions support
  - From: Xin Li (Intel)
- [RFC PATCH v2 06/34] x86/msr: Use the alternatives mechanism to read PMC
  - From: Xin Li (Intel)
- Re: [RFC PATCH v2 06/34] x86/msr: Use the alternatives mechanism to read PMC
  - From: Jürgen Groß
- Re: [RFC PATCH v2 06/34] x86/msr: Use the alternatives mechanism to read PMC
  - From: Xin Li
- Re: [RFC PATCH v2 06/34] x86/msr: Use the alternatives mechanism to read PMC
  - From: Juergen Gross

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