Re: [Xen-devel] [PATCH v1] x86/hvm: Generic instruction re-execution mechanism for execute faults

[Alexandru Stefan ISAILA <aisaila@xxxxxxxxxxxxxxx>]

On 27.11.2018 13:32, Roger Pau Monné wrote:
> Would it be possible to add some kind of flag to the emulator to
> signal whether p2m restrictions should be enforced/ignored?
> hvmemul_acquire_page seems like a suitable place, but I'm not that
> familiar with the emulator.
> 
> Then you could generate vm events from the emulator itself, which
> AFAICT is the only way to handle this instruction execution issue.

I've been testing what place would be the best to have the emulator send 
a event and it turns out the hvmemul_acquire_page is not ok. What worked 
form me was having the emulator send write access violations from 
hvmemul_map_linear_addr(). Here I can get the gfn, gla and offset for 
the event.

For the exec access violation I've tried to send events from 
hvmemul_insn_fetch() but there is a problem to get the same variables 
for the event. Is there a way to go around and get those params for the 
event? Any thoughts are appreciated.

Regards,
Alex
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