[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] Writable page tables
On 6 Apr 2006, at 22:50, Ky Srinivasan wrote: I have a question with regards to writable page table support. I am ableto modify a page table entry via the hypercall interface (xen_l1_entry_update). However, if I enable the writable page tablefeature, the hypervisor fails to fix up the write fault on the same pagetable. The fixup fails in ptwr_do_page_fault() - the problem appears to be with the TYPE_COUNT (it is 0 and all other checks pass). Why is the writable code path more restrictive, given that the modifications donevia the writable path will be validated by the hypervisor before hookingin the page table under question. Since the validation is deferred, I was expecting this path would have fewer checks. Have you write protected the page but not yet pinned it as a pagetable page, nor hooked it into an existing pagetable? -- Keir _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel
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