Re: [Xen-devel] [PATCH] xen: provide pse36 cpuid bit

[Christoph Egger <Christoph.Egger@xxxxxxx>]

On 10/27/11 16:06, Tim Deegan wrote:
> At 14:10 +0200 on 27 Oct (1319724631), Christoph Egger wrote:
> > Provide pse36 cpuid bit if guest runs in 32bit PAE
> > or in long mode. Hyper-V refuses to start as
> > the "cpu does not provide required hw features"
> > if it does not find the pse36 cpuid bits.
> >
> > Signed-off-by: Christoph Egger<Christoph.Egger@xxxxxxx>
> This patch appears to advertise PSE36 support to guests without actually
> supporting PSE36.  Or am I missing something?
That's right. The paging format differs only in 32bit legacy mode.
Since Hyper-V is not running in 32bit legacy mode but insists on having
these cpuid bits present it is sufficient to just populate them to the
guest when guest paging mode != 32bit legacy mode.

Christoph


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