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[Xen-devel] Re: [PATCH 1/2] xen/mmu: Add workaround "x86-64, mm: Put ear

To: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
Subject: [Xen-devel] Re: [PATCH 1/2] xen/mmu: Add workaround "x86-64, mm: Put early page table high"
From: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
Date: Thu, 5 May 2011 15:06:18 +0100
Cc: "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>, Stefano Stabellini <Stefano.Stabellini@xxxxxxxxxxxxx>, "linux-kernel@xxxxxxxxxxxxxxx" <linux-kernel@xxxxxxxxxxxxxxx>, "hpa@xxxxxxxxx" <hpa@xxxxxxxxx>, "yinghai@xxxxxxxxxx" <yinghai@xxxxxxxxxx>, Daniel Kiper <dkiper@xxxxxxxxxxxx>
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On Thu, 5 May 2011, Konrad Rzeszutek Wilk wrote:
> > In any case you are right about the fact that the change is not needed
> > on X86_32 so if it has any bad side effects on X86_32 we can always do
> Why not? Can't you boot a 32-bit Dom0 on those machines?

Because e820_end_of_low_ram_pfn() is not called on 32-bit,
find_low_pfn_range() is called instead and works differently.
AFAICT find_low_pfn_range() is not affected by the issue described in
the previous email.

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