Re: [Xen-devel] RIP register value in p2m_mem_access_check()

[Razvan Cojocaru <rzvncj@xxxxxxxxx>]

> > Thank you for your answer. Isn't it possible that emulation is indeed
> > involved, since in p2m_mem_access_check() a page fault has occured, and
> > RIP might point to _after_ the offending instruction?
> That wouldn't match your observation (the two values were
> much farther apart), unless a call or jump got emulated.
I've noticed that, and have indeed assumed that it was something like a 
call.
> Further, after emulation, the user_regs.eip value should be the
> canonical one.
>
> And finally, you said you took this right after a page fault
> occurred, and - just like for any fault - the RIP the fault refers
> to is the faulting instruction, not the one following it.
Fair enough. Will debug the issue.


Thanks,
Razvan Cojocaru


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