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Re: [Xen-devel] [PATCH] VT-d: don't crash when PTE bits 52 and up are non-zero

>>> On 23.12.14 at 07:52, <kevin.tian@xxxxxxxxx> wrote:
>>  From: Jan Beulich [mailto:JBeulich@xxxxxxxx]
>> Sent: Friday, December 19, 2014 7:26 PM
>> This can (and will) be legitimately the case when sharing page tables
>> with EPT (more of a problem before p2m_access_rwx became zero, but
>> still possible even now when other than that is the default for a
>> guest), leading to an unconditional crash (in print_vtd_entries())
>> when a DMA remapping fault occurs.
> could you elaborate the scenarios when bits 52+ are non-zero?

This happens with shared page tables and a non-zero access type.


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