Re: Mem_event API and MEM_EVENT_REASON_SINGLESTEP

[Razvan Cojocaru <rzvncj@gmail.com>]

> After you set single stepping on for a VCPU and resume, you should see
> a single step mem_event soon after. What is the behavior that you are
> observing? Are you trying this on an UP or SMP guest?

I do see single step mem_events after. I've tried it on a SMP HVM
Slackware guest. What behaviour am I observing? The gla and gfn values
are being printed out - but I don't know how to detect a write operation
based on them. Tim Deegan has kindly suggested that I pass those values
to a debugger API that I assume Xen has, but I don't think there have
been any replies on that topic since.

Unfortunately I don't have access to the computer I've written the test
code on, and it's a rather complicated setup that I can't easily
duplicate at home, so if you need specific details (gfn/gla values,
etc.) I'm afraid I'll only be able to provide them on Monday.

Thanks,
Razvan Cojocaru