linux-kernel - Re: [PATCH 16 of 55] xen64: add extra pv_mmu

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Date:	Wed, 09 Jul 2008 08:55:10 +0100
From:	Mark McLoughlin <markmc@...hat.com>
To:	Jeremy Fitzhardinge <jeremy@...p.org>
Cc:	Ingo Molnar <mingo@...e.hu>, LKML <linux-kernel@...r.kernel.org>,
	x86@...nel.org, Stephen Tweedie <sct@...hat.com>,
	Eduardo Habkost <ehabkost@...hat.com>
Subject: Re: [PATCH 16 of 55] xen64: add extra pv_mmu_ops

Hey Jeremy,

On Tue, 2008-07-08 at 15:06 -0700, Jeremy Fitzhardinge wrote:
> We need extra pv_mmu_ops for 64-bit, to deal with the extra level of
> pagetable.
> 
> Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>
> ---
>  arch/x86/xen/enlighten.c   |   33 +++++++++++++++++++++++++++-
>  arch/x86/xen/mmu.c         |   51 +++++++++++++++++++++++++++++++++++++++++++-
>  arch/x86/xen/mmu.h         |   15 +++++++++++-
>  include/asm-x86/xen/page.h |    4 +++
>  4 files changed, 99 insertions(+), 4 deletions(-)
...
> diff --git a/arch/x86/xen/mmu.c b/arch/x86/xen/mmu.c
> --- a/arch/x86/xen/mmu.c
> +++ b/arch/x86/xen/mmu.c
> @@ -438,14 +438,19 @@
>  
>  void xen_set_pte(pte_t *ptep, pte_t pte)
>  {
> +#ifdef CONFIG_X86_PAE
>  	ptep->pte_high = pte.pte_high;
>  	smp_wmb();
>  	ptep->pte_low = pte.pte_low;
> +#else
> +	*ptep = pte;
> +#endif
>  }

You've dropped non-PAE support already, right? Any reason to use the
X86_PAE macro instead of X86_32?

Cheers,
Mark.

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