Re: [Xen-devel] [PATCH 05/15] xen: p2m: new 'p2m_epc' type for EPC mapping

[George Dunlap <George.Dunlap@xxxxxxxxxx>]

> On Jul 12, 2017, at 1:01 PM, Andrew Cooper <andrew.cooper3@xxxxxxxxxx> wrote:
> 
> On 09/07/17 10:12, Kai Huang wrote:
>> A new 'p2m_epc' type is added for EPC mapping type. Two wrapper functions
>> set_epc_p2m_entry and clear_epc_p2m_entry are also added for further use.
> 
> Other groups in Intel have been looking to reduce the number of p2m types we 
> have, so we can use more hardware defined bits in the EPT pagetable entries.
> 
> If we need a new type then we will certainly add one, but it is not clear why 
> this type is needed.

Does the hypervisor need to know which pages of a domain’s p2m 1) have valid 
config set up, but 2) aren’t accessible to itself or any other domain?

 -George
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