[Xen-devel] Re: [PATCH xen-unstable] Remove PSE flag from guest CR4

[Dave McCracken <dcm@xxxxxxxx>]

On Monday 14 September 2009, Keir Fraser wrote:
> If you hide PSE in CR4 and CPUID, how does the guest know it can use
> superpages?

Linux assumes it will just work.

Since hugepages in Linux are an optional feature the kernel will boot even on 
a machine that doesn't support PSE.  Applications that use hugepages will get 
a nasty error.

With the PSE bit set in CPUID Linux tries to do things like map the entire 
kernel in hugepages.

Dave McCracken

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