Re: [Xen-devel] [PATCH 07/11] x86/altp2m: introduce p2m_ram_rw_ve type.

[Ed White <edmund.h.white@xxxxxxxxx>]

On 01/15/2015 09:03 AM, Tim Deegan wrote:
> At 13:26 -0800 on 09 Jan (1420806397), Ed White wrote:
>> This is treated exactly like p2m_ram_rw, except that suppress_ve is not
>> set in the EPTE.
> 
> I don't think this is going to work -- you probably want to support
> p2m_ram_ro at least, and maybe other types, but duplicating each of
> them as a 'type foo with #VE' doesn't seem right.
> 
> Since the default is to set the ignore-#ve flag everywhere, how about
> having an operation to enable #ve for a frame that just clears that
> bit, and then having all other updates to altp2m entries preserve it?

I hear you, but #VE is only even relevant for the in-domain agent
model, and as the only current user of that model we not only don't
want #VE to work on other page types, we specifically want it to be
prohibited.

Can we do it this way, and then change it later if required?

Ed


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