[Xen-devel] Re: [PATCH 12/12] xen/mtrr: Add mtrr_if support for Xen mtrr

[Ingo Molnar <mingo@xxxxxxx>]

* stefano.stabellini@xxxxxxxxxxxxx <stefano.stabellini@xxxxxxxxxxxxx> wrote:

> From: Stephen Tweedie <sct@xxxxxxxxxx>
> 
> Add a Xen mtrr type, and reorganise mtrr initialisation slightly to
> allow the mtrr driver to set up num_var_ranges (Xen needs to do this by
> querying the hypervisor itself.)
> 
> [ Impact: add basic MTRR support ]
> 
> Signed-off-by: Stephen Tweedie <sct@xxxxxxxxxx>
> Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@xxxxxxxxxx>
> Signed-off-by: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
> ---
>  arch/x86/kernel/cpu/mtrr/Makefile |    2 +-
>  arch/x86/kernel/cpu/mtrr/main.c   |    3 +
>  arch/x86/kernel/cpu/mtrr/mtrr.h   |    7 ++
>  arch/x86/kernel/cpu/mtrr/xen.c    |  110 
> +++++++++++++++++++++++++++++++++++++
>  4 files changed, 121 insertions(+), 1 deletions(-)
>  create mode 100644 arch/x86/kernel/cpu/mtrr/xen.c

Still NAK, for the very same reasons as we NAK-ed it the previous time: 
/proc/mtrr is a problematic and complicated legacy interface that should 
die. Any modern X server will do the right thing via PAT.

Also, please get the Ack of at least one x86 maintainer for x86 patches.

Thanks,

        Ingo

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