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Re: [Xen-devel] XENFEAT_writable_pagetables vs VMASST_TYPE_writable_page
| To: | "Keir Fraser" <Keir.Fraser@xxxxxxxxxxxx> |
|---|---|
| Subject: | Re: [Xen-devel] XENFEAT_writable_pagetables vs VMASST_TYPE_writable_pagetables |
| 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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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 somewhere). 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. Jacob _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel |
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