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Re: [Xen-devel] [PATCH] [Xen] Check FADT's signature

To: Stefan Berger <stefanb@xxxxxxxxxx>
Subject: Re: [Xen-devel] [PATCH] [Xen] Check FADT's signature
From: Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>
Date: Fri, 10 Aug 2007 20:15:57 +0100
Cc: xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxx>, Jan Beulich <jbeulich@xxxxxxxxxx>
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A good debugging approach will be to write a function that walks the pagetables for that virtual address and prints the PTE that maps it. Scatter calls to this function between acpi_boot_table_init() and acpi_boot_init() and hence narrow down exactly where the PTE is getting zapped.

 -- Keir

On 10/8/07 19:21, "Keir Fraser" <keir@xxxxxxxxxxxxx> wrote:

On 10/8/07 18:00, "Stefan Berger" <stefanb@xxxxxxxxxx> wrote:

(XEN) map_pages_to_xen : 3533                                                       (that's the line number)
(XEN) 0xfff9b000 was NOT present.

Something between (*) and here seems to trash this presence flag.
paging_init() and many others lie in between the upper call and this one here. Could be a side effect of this? Maybe that tlb flush at the right place in one of these functions would solve the problem?

Yes, this now looks likely and that’s rather scary. We’ll go after this next week.

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