Re: [Xen-devel] [HYBRID]: XEN_EMULATE_PREFIX in user process

[Mukesh Rathor <mukesh.rathor@xxxxxxxxxx>]

On Fri, 29 Jun 2012 11:15:46 -0700
Mukesh Rathor <mukesh.rathor@xxxxxxxxxx> wrote:
> > It's unlikely but not impossible for a userspace developer to have
> > done some "Xen magic" and used the prefix in userspace.
> > 
> > What version of dm_mapper do you have? I checked the version in
> > Debian Sid and it doesn't do this (at least not directly).
> > 
> > Are you able to run the dm_mapper process under gdb and inspect it
> > to find the prefix?
> 
> Well, let me take that back. dm_mapper is the last printk, but it
> could be anything after that or that. 
> 
> Unfortunately, it's dom0 and during boot, so can't run gdb on it. I am
> hacking the kernel now to print every user process name in schedule.

Ah, it's "xen-detect" coming in right after dm_mapper. I see the
xen prefix in it. Hmm... let me see if I can add some run time check
for hybrid dom0, then won't have to worry about invalid_op trap. Less
code that way. That's the end goal anyways...

Thanks,
Mukesh


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