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

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Message-ID: <6575702e-fea5-61b2-dd61-7b556a8603e8@citrix.com>
Date:   Fri, 15 Sep 2023 02:16:50 +0100
From:   andrew.cooper3@...rix.com
To:     "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, jgross@...e.com,
        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 15/09/2023 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.

~Andrew