On 12/16/2014 01:58 AM, Juergen Gross wrote:
> VMWare seems not to emulate the PAT MSR correctly: reaeding
> MSR_IA32_CR_PAT returns 0 even after writing another value to it.
>
> Detect this bug and don't use the read value if it is 0.
>
> Commit bd809af16e3ab1f8d55b3e2928c47c67e2a865d2 ("x86: Enable PAT to
> use cache mode translation tables") triggers this VMWare bug when the
> kernel is booted as a VMWare guest.
>
> Reported-by: Jongman Heo <[email protected]>
> Signed-off-by: Juergen Gross <[email protected]>
> Tested-by: Jongman Heo <[email protected]>
I presume cachability control is irrelevant for a VMware guest? I'm
wondering if it would be better to just plain ignore the failure rather
than disabling PAT.
-hpa
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