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

[Juergen Gross]

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@xxxxxxxxxxxxxxx>

Thanks,


Juergen

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