Re: [PATCH 5/6] x86/paravirt: Switch MSR access pv_ops functions to instruction interfaces

To: Juergen Gross <jgross@xxxxxxxx>, linux-kernel@xxxxxxxxxxxxxxx, x86@xxxxxxxxxx, virtualization@xxxxxxxxxxxxxxx
Subject: Re: [PATCH 5/6] x86/paravirt: Switch MSR access pv_ops functions to instruction interfaces
From: Xin Li <xin@xxxxxxxxx>
Date: Mon, 12 May 2025 22:55:53 -0700
Cc: Ajay Kaher <ajay.kaher@xxxxxxxxxxxx>, Alexey Makhalov <alexey.amakhalov@xxxxxxxxxxxx>, Broadcom internal kernel review list <bcm-kernel-feedback-list@xxxxxxxxxxxx>, Thomas Gleixner <tglx@xxxxxxxxxxxxx>, Ingo Molnar <mingo@xxxxxxxxxx>, Borislav Petkov <bp@xxxxxxxxx>, Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>, "H. Peter Anvin" <hpa@xxxxxxxxx>, Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
In-reply-to: <ff567466-a46a-4f66-935a-8fae1140c1a2@suse.com>
References: <20250506092015.1849-1-jgross@suse.com> <20250506092015.1849-6-jgross@suse.com> <722f5b30-20e9-4540-98e4-d211d7c44cbe@zytor.com> <9f4e33d5-9cb3-4079-b764-87a15265fd52@suse.com> <ff567466-a46a-4f66-935a-8fae1140c1a2@suse.com>
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On 5/12/2025 4:24 AM, Juergen Gross wrote:

Now with the mentioned patch really attached. :-)


Does it allow patching with an instruction more than 6 bytes long?

The immediate form MSR instructions are 9 bytes long.

Thanks!
    Xin

Follow-Ups:
- Re: [PATCH 5/6] x86/paravirt: Switch MSR access pv_ops functions to instruction interfaces
  - From: Jürgen Groß

References:
- [PATCH 0/6] x86/msr: let paravirt inline rdmsr/wrmsr instructions
  - From: Juergen Gross
- [PATCH 5/6] x86/paravirt: Switch MSR access pv_ops functions to instruction interfaces
  - From: Juergen Gross
- Re: [PATCH 5/6] x86/paravirt: Switch MSR access pv_ops functions to instruction interfaces
  - From: Xin Li
- Re: [PATCH 5/6] x86/paravirt: Switch MSR access pv_ops functions to instruction interfaces
  - From: Jürgen Groß
- Re: [PATCH 5/6] x86/paravirt: Switch MSR access pv_ops functions to instruction interfaces
  - From: Juergen Gross