linux-kernel - Re: [PATCH v2 5/8] x86/mtrr: revert commit 90b926e68f50

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Message-ID: <47d6d93f-defd-d18a-276a-417252e7ddce@nerdbynature.de>
Date:   Mon, 13 Feb 2023 23:54:14 +0100 (CET)
From:   Christian Kujau <lists@...dbynature.de>
To:     Juergen Gross <jgross@...e.com>
cc:     mikelley@...rosoft.com,
        Linux regressions mailing list <regressions@...ts.linux.dev>,
        linux-kernel@...r.kernel.org, x86@...nel.org,
        torvalds@...ux-foundation.org,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Andy Lutomirski <luto@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "H. Peter Anvin" <hpa@...or.com>
Subject: Re: [PATCH v2 5/8] x86/mtrr: revert commit 90b926e68f50

On Mon, 13 Feb 2023, Juergen Gross wrote:
> Hmm, this would make Hyper-V SEV-SNP guests slow again.
> 
> I'm not completely against it, but OTOH I'm a little bit biased as the
> maintainer of the Xen code. :-)

Understood. I'm a bit puzzled why nobody else reports this, maybe Xen Dom0 
and external USB enclosures are not that common.

> Michael, would you see major problems with doing the revert before having
> the final patches for fixing your issue, too?

If that revert ends up in mainline, feel free to add:

 Tested-by: Christian Kujau <lists@...dbynature.de> 

...if that makes any difference.

Thanks,
Christian.
-- 
BOFH excuse #199:

the curls in your keyboard cord are losing electricity.