Re: [Xen-devel] Question about MMUEXT_PIN_L3_TABLE

[Keir Fraser <keir.fraser@xxxxxxxxxxxxx>]

On 08/07/2010 11:57, "W. Michael Petullo" <mike@xxxxxxxx> wrote:

> (XEN) mm.c:1185:d13 PAE L3 slot is shared
> (XEN) mm.c:1393:d13 Failure in alloc_l3_table: entry 4
> (XEN) mm.c:2070:d13 Error while validating mfn 79f0a (pfn 4c2) for type
> 60000000: caf=80000003 taf=60000001
> (XEN) mm.c:2700:d13 Error while pinning mfn 79f0a
> 
> I have not yet had any luck finding the cause of this. From what I
> can tell, the kernel's page tables are valid. The kernel initializes
> memory and performs many other initializations successfully before this
> point. Does anyone have any suggestions?

The fourth L2 page directory (that is, the one pointed at by the fourth and
final L3 pgdir entry) must not be shared by multiple L3 page directories.
You need one such L2 pogdir for every L3 pgdir. Many OSes would normally
share these, and will need modifying to not do so.

 -- Keir




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