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

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.

Razvan Cojocaru

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