linux-kernel - Re: [Xen-devel] [PATCH V3 3/6]: PVH: mmu related changes.

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Message-ID: <1350557230.2460.115.camel@zakaz.uk.xensource.com>
Date:	Thu, 18 Oct 2012 11:47:10 +0100
From:	Ian Campbell <Ian.Campbell@...rix.com>
To:	Mukesh Rathor <mukesh.rathor@...cle.com>
CC:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	"Xen-devel@...ts.xensource.com" <Xen-devel@...ts.xensource.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [Xen-devel] [PATCH V3 3/6]: PVH:  mmu related changes.

On Thu, 2012-10-18 at 01:31 +0100, Mukesh Rathor wrote:
>          * the initial domain. For guests using the toolstack, they are in:
> @@ -2177,8 +2210,20 @@ static const struct pv_mmu_ops xen_mmu_ops __initconst = {
> 
>  void __init xen_init_mmu_ops(void)
>  {
> -       x86_init.mapping.pagetable_reserve = xen_mapping_pagetable_reserve;
>         x86_init.paging.pagetable_init = xen_pagetable_init;
> +
> +       if (xen_feature(XENFEAT_auto_translated_physmap)) {
> +               pv_mmu_ops.flush_tlb_others = xen_flush_tlb_others;
> +#if 0

I don't recall seeing this #if 0 before -- is it new and/or deliberate?

If it is a marker for future work can we leave it out for now?

> +               /* For PCI devices to map iomem. */
> +               if (xen_initial_domain()) {
> +                       pv_mmu_ops.set_pte = native_set_pte;
> +                       pv_mmu_ops.set_pte_at = native_set_pte_at;
> +               }
> +#endif
> +               return;
> +       }
> +       x86_init.mapping.pagetable_reserve = xen_mapping_pagetable_reserve;
>         pv_mmu_ops = xen_mmu_ops;
> 


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