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Re: [Xen-devel] Design question for PV superpage support

from [Jeremy Fitzhardinge] [Permanent Link][Original]
To: Dave McCracken <dcm@xxxxxxxx>
Subject: Re: [Xen-devel] Design question for PV superpage support
From: Jeremy Fitzhardinge <jeremy@xxxxxxxx>
Date: Mon, 02 Mar 2009 17:32:38 -0800
Cc: Xen Developers List <xen-devel@xxxxxxxxxxxxxxxxxxx>, Mick.Jordan@xxxxxxx
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Dave McCracken wrote:
No, actually, it doesn't do that. The hypervisor allocates 2M pages, then expands them into 4K pages for the mfn<->pfn maps, etc.
What happens if you start using MMU_MACHPHYS_UPDATE on pages which are part of a 2M mapping? 

   J

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