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Re: [Xen-devel] XENFEAT_writable_pagetables vs VMASST_TYPE_writable_pagetables

  • To: "Keir Fraser" <Keir.Fraser@xxxxxxxxxxxx>
  • From: "Jacob Gorm Hansen" <jacobg@xxxxxxx>
  • Date: Thu, 1 Jun 2006 09:42:51 +0200
  • Cc: xen-devel@xxxxxxxxxxxxxxxxxxx
  • Delivery-date: Thu, 01 Jun 2006 00:43:14 -0700
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  • List-id: Xen developer discussion <xen-devel.lists.xensource.com>

On 5/31/06, Keir Fraser <Keir.Fraser@xxxxxxxxxxxx> wrote:

This doesn't look like the result of a pmd_clear() call. Looks like a
L2 (pgd) is being allocated -- perhaps due to pinning or changing %cr3.
It's failing because one of the L1 pages it references is writable by
the guest (ie. the guest has a writable mapping of that L1 page

Hmm it _does_ happen on pmd_clear (which is a macro that turns into a
xen mmu update call). The funny thing is how giving val=0 can end up
as an alloc_l2_page.


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