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

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Date:   Tue, 14 Feb 2023 08:13:38 +0100
From:   Juergen Gross <jgross@...e.com>
To:     Christian Kujau <lists@...dbynature.de>
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 13.02.23 23:54, Christian Kujau wrote:
> 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.

Not all USB drivers/interfaces have this problem. Your problems are with:

   Intel Corporation 8 Series/C220 Series Chipset Family USB xHCI (rev 05)

while a system I'm working with the following has no problems:

   Intel Corporation 8 Series/C220 Series Chipset Family USB xHCI (rev 04)

The only difference seems to be the revision of your adapter.

> 
>> 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>

Thanks,


Juergen


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