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Re: [Xen-devel] [PATCH RFC v2 1/4] x86/mm: Shadow and p2m changes for PV mem_access

>> Is the page_list the only place that will tell me the range of pages that
>> belong to a PV guest?
>Yes. No upper bound on the PFN space is being tracked.

OK, in that case the only thing I can think of is to set a max memory limit for 
PV domains that an access listener can attach to so that the hypercall 
preemption / continuation is not required. In addition we could add a kernel 
command line parameter that overrides this and document that this could cause 
denial of service issues when used. 

Tim, can you think of any other options here?


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