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

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Message-ID: <16f87dc6-75d6-4731-ac8e-fafc6e84478a@zytor.com>
Date: Mon, 12 May 2025 23:55:57 -0700
From: Xin Li <xin@...or.com>
To: Jürgen 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 11:06 PM, Jürgen Groß wrote:
> On 13.05.25 07:55, Xin Li wrote:
>> 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.
> 
> Yes, shouldn't be a problem.
> 

Excellent, I will give it a try.