Re: [Xen-devel] dom0 boot failure with 256G

["Jan Beulich" <jbeulich@xxxxxxxxxx>]

>>> Keir Fraser <keir.fraser@xxxxxxxxxxxxx> 05.06.08 14:58 >>>
>On 5/6/08 13:54, "Jeremy Fitzhardinge" <jeremy@xxxxxxxx> wrote:
>
>> Keir Fraser wrote:
>>> Actually compat guests are good for up to 128GB, so you should be fine with
>>> no dom0_mem= parameter.
>>>   
>> 
>> Real PAE processors are limited to 2^36 = 64GB, and the guest kernel may
>> mask ptes at that point.
>
>A paravirtualised kernel needs to have its PAGE_MASK widened. This is a bug
>we've bumped into once or twice.

Even a native kernel ought to honor the physical address width the
processor supports rather than arbitrarily masking off bits just because
original PAE only supported 36 bits.

Jan


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