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Re: [Xen-devel] Can't set break points with Linux guest in PAE mode

  • To: Randy Thelen <rthelen@xxxxxxxxxx>, xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxx>
  • From: Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>
  • Date: Thu, 05 Oct 2006 08:43:51 +0100
  • Delivery-date: Thu, 05 Oct 2006 00:59:07 -0700
  • List-id: Xen developer discussion <xen-devel.lists.xensource.com>
  • Thread-index: AcboUf/nPnxlWVRFEdubrgANk04WTA==
  • Thread-topic: [Xen-devel] Can't set break points with Linux guest in PAE mode

On 5/10/06 12:54 am, "Randy Thelen" <rthelen@xxxxxxxxxx> wrote:

> (XEN) DOM0: (file=mm.c, line=1688) Bad type (saw 28000001 != exp
> e0000000) for mfn 96efe (pfn 573)
> (XEN) DOM0: (file=mm.c, line=606) Error getting mfn 96efe (pfn 573)
> from L1 entry 0000000096efe027 for dom8
> (XEN) DOM0: (file=mm.c, line=1266) Bad get_page_from_l1e(): pl1e =
> fefa6a30, nl1e = 96efe027, ol1e = 0, gl1mfn = d8538
> (XEN) DOM0: (file=mm.c, line=2283) Could not modify L1 entry: va ==
> fefa6a30, l1e == 96efe027, mfn == d8538
> (I've added the two MEM_LOG() calls at line 1266 and 2283.)
> Any ideas where I should begin looking?  Or is PAE support languishing?

Xen thinks you are trying to map a guest pagetable page, and is not allowing
you write access. This is probably because the virt_to_phys translation code
that gdbserver is using is broken for PAE. My guess would be that it returns
the physical address of the PTE that maps the virtual address, rather than
the physical address that is mapped at the virtual address.

 -- Keir

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