Messages in this thread | | | Date | Mon, 7 Jan 2013 13:52:11 +0100 | From | Daniel Kiper <> | Subject | Re: [PATCH v3 02/11] x86/kexec: Add extra pointers to transition page table PGD, PUD, PMD and PTE |
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On Mon, Jan 07, 2013 at 09:48:20AM +0000, Jan Beulich wrote: > >>> On 04.01.13 at 18:25, Daniel Kiper <daniel.kiper@oracle.com> wrote: > > Right, so where is virtual mapping of control page established? > > I could not find relevant code in SLES kernel which does that. > > In the hypervisor (xen/arch/x86/machine_kexec.c:machine_kexec_load()). > xen/arch/x86/machine_kexec.c:machine_kexec() then simply uses > image->page_list[1].
This (xen/arch/x86/machine_kexec.c:machine_kexec_load()) maps relevant page (allocated earlier by dom0) in hypervisor fixmap area. However, it does not make relevant mapping in transition page table which leads to crash when %cr3 is switched from Xen page table to transition page table.
Daniel
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