Re: [PATCH v3 02/11] x86/kexec: Add extra pointers to transitionpage table PGD, PUD, PMD and PTE

From: Daniel Kiper
Date: Mon Jan 07 2013 - 07:52:37 EST

On Mon, Jan 07, 2013 at 09:48:20AM +0000, Jan Beulich wrote:
> >>> On 04.01.13 at 18:25, Daniel Kiper <daniel.kiper@xxxxxxxxxx> 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.

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