Re: [PATCH v2 5/6] x86/xen,pat: Remove PAT table init code from Xen

[Borislav Petkov]

On Wed, Mar 16, 2016 at 06:46:58PM -0600, Toshi Kani wrote:
> Xen supports PAT without MTRR for its guests.  In order to
> enable WC attribute, it was necessary for xen_start_kernel()
> to call pat_init_cache_modes() to update PAT table before
> starting guest kernel.
> 
> Now that the kernel initializes PAT table to the BIOS handoff
> state when MTRR is disabled, this Xen-specific PAT init code
> is no longer necessary.  Delete it from xen_start_kernel().
> 
> Also change pat_init_cache_modes() to a static function since
> PAT table should not be tweaked by other modules.
> 
> Signed-off-by: Toshi Kani <toshi.kani@xxxxxxx>
> Cc: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
> Cc: Borislav Petkov <bp@xxxxxxx>
> Cc: Luis R. Rodriguez <mcgrof@xxxxxxxx>
> Cc: Juergen Gross <jgross@xxxxxxxx>
> Cc: Ingo Molnar <mingo@xxxxxxxxxx>
> Cc: H. Peter Anvin <hpa@xxxxxxxxx>
> Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
> ---
>  arch/x86/include/asm/pat.h |    1 -
>  arch/x86/mm/pat.c          |    2 +-
>  arch/x86/xen/enlighten.c   |    9 ---------
>  3 files changed, 1 insertion(+), 11 deletions(-)

JÃrgen, ack?

-- 
Regards/Gruss,
    Boris.

SUSE Linux GmbH, GF: Felix ImendÃrffer, Jane Smithard, Graham Norton, HRB 21284 (AG NÃrnberg)
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