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Re: [Xen-devel] mapping of memory below 16Mb

  • To: Jan Beulich <jbeulich@xxxxxxxxxx>
  • From: Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>
  • Date: Fri, 25 Jan 2008 07:57:25 +0000
  • Cc: xen-devel@xxxxxxxxxxxxxxxxxxx
  • Delivery-date: Thu, 24 Jan 2008 23:57:40 -0800
  • List-id: Xen developer discussion <xen-devel.lists.xensource.com>
  • Thread-index: AchfJ+wgKsHoyssbEdyw+AAWy6hiGQ==
  • Thread-topic: [Xen-devel] mapping of memory below 16Mb

On 25/1/08 07:51, "Jan Beulich" <jbeulich@xxxxxxxxxx> wrote:

>> This has a side 'benefit' that the range 0-1GB cannot be mapped with a 1GB
>> superpage mapping, and that simplifies your patch a bit (since we will never
>> need to free the statically-allocated first few l2e ident mapping pages).
> Actually - no, it would guarantee only the first of them would never be
> freed. The others, as long as head.S puts them into l3_identmap
> unconditionally, will still be subject to eventual freeing.

Ah yes, because they map a 4GB range.

 -- Keir

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