Re: [Xen-devel] Re: [PATCH 06/16] xen: disable PAT

[Jeremy Fitzhardinge <jeremy@xxxxxxxx>]

Jan Beulich wrote:
> Depending on what exact plans you have here, I would question whether
> having an upper layer dictate mechanisms used by a lower layer. In
> particular, just like with the same mistake made with kexec,
> - Linux's use of PAT may change (specifically, the value it writes to the PAT
>   MSR may not be statically determinable at some point, making the ELF note
>   approach you indicated as a possible solution unusable)
>   
If Linux grows the ability to dynamically choose its PAT settings at 
runtime, then we can hook that mechanism to make sure there's some way 
to work with Xen.  The current problem is because both Linux and Xen 
current have incompatible static PAT setups.
> - the interface may not be suitable for non-Linux
How do other guests use PAT (both native and under Xen)?

   J

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