linux-kernel - Re: [PATCH 5/6] x86/paravirt: Switch MSR access pv

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Message-ID: <eb077393-ea95-4ac0-9479-980e227f7bff@zytor.com>
Date: Mon, 12 May 2025 22:55:53 -0700
From: Xin Li <xin@...or.com>
To: Juergen Gross <jgross@...e.com>, linux-kernel@...r.kernel.org,
        x86@...nel.org, virtualization@...ts.linux.dev
Cc: Ajay Kaher <ajay.kaher@...adcom.com>,
        Alexey Makhalov <alexey.amakhalov@...adcom.com>,
        Broadcom internal kernel review list
 <bcm-kernel-feedback-list@...adcom.com>,
        Thomas Gleixner
 <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>,
        Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        "H. Peter Anvin" <hpa@...or.com>,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        xen-devel@...ts.xenproject.org
Subject: Re: [PATCH 5/6] x86/paravirt: Switch MSR access pv_ops functions to
 instruction interfaces

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