linux-kernel - Re: [PATCH v10 03/38] x86/msr: Add the WRMSRNS instruction support

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Message-ID: <59a556d0-b962-4b63-9127-ba799db3b0ed@suse.com>
Date:   Fri, 15 Sep 2023 07:32:02 +0200
From:   Juergen Gross <jgross@...e.com>
To:     andrew.cooper3@...rix.com, "H. Peter Anvin" <hpa@...or.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Xin Li <xin3.li@...el.com>, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-edac@...r.kernel.org,
        linux-hyperv@...r.kernel.org, kvm@...r.kernel.org,
        xen-devel@...ts.xenproject.org
Cc:     mingo@...hat.com, bp@...en8.de, dave.hansen@...ux.intel.com,
        x86@...nel.org, luto@...nel.org, pbonzini@...hat.com,
        seanjc@...gle.com, peterz@...radead.org, ravi.v.shankar@...el.com,
        mhiramat@...nel.org, jiangshanlai@...il.com
Subject: Re: [PATCH v10 03/38] x86/msr: Add the WRMSRNS instruction support

On 15.09.23 03:16, andrew.cooper3@...rix.com wrote:
> On 15/09/2023 2:01 am, H. Peter Anvin wrote:
>> The whole bit with alternatives and pvops being separate is a major
>> maintainability problem, and honestly it never made any sense in the
>> first place. Never have two mechanisms to do one job; it makes it
>> harder to grok their interactions.
> 
> This bit is easy.
> 
> Juergen has already done the work to delete one of these two patching
> mechanisms and replace it with the other.
> 
> https://lore.kernel.org/lkml/a32e211f-4add-4fb2-9e5a-480ae9b9bbf2@suse.com/
> 
> Unfortunately, it's only collecting pings and tumbleweeds.

Indeed.

Unfortunately there is probably some objtool support needed for that, which I'm
not sure how to implement.


Juergen

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