Re: [Xen-devel] [PATCH] x86/AMD: apply erratum 665 workaround

[Andrew Cooper <andrew.cooper3@xxxxxxxxxx>]

On 26/09/16 13:27, Jan Beulich wrote:
> From: Emanuel Czirai <icanrealizeum@xxxxxxxxx>
>
> AMD F12h machines have an erratum which can cause DIV/IDIV to behave
> unpredictably. The workaround is to set MSRC001_1029[31] but sometimes
> there is no BIOS update containing that workaround so let's do it
> ourselves unconditionally. It is simple enough.
>
> [ Borislav: Wrote commit message. ]
>
> Signed-off-by: Emanuel Czirai <icanrealizeum@xxxxxxxxx>
> Signed-off-by: Borislav Petkov <bp@xxxxxxx>
> [Linux commit: d1992996753132e2dafe955cccb2fb0714d3cfc4]
>
> Make applicable to Xen.
>
> Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>

Reviewed-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>

It would be nice to have a name for this bit, but the Fam 12h BKDG
identified it as reserved, making the erratum description the only
reference I can find to it.  Oh well.

~Andrew

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