Re: [Xen-devel] [PATCH] xen/x86: Adjust stack pointer in xen_sysexit

[Boris Ostrovsky]

On 11/17/2015 02:37 PM, Boris Ostrovsky wrote:
> On 11/17/2015 02:16 PM, Andy Lutomirski wrote:
> > > > Looks good to me.  Does Xen have any sysexit/sysret32 equivalent to
> > > > return to 32-bit user mode?  If so, it could be worth trying to wire
> > > > it up by patching the jz instead of the test instruction.
>
> We can actually make patching a little bit more efficient by replacing 
> the test instruction with 'xor %eax,%eax'. That way we won't need any 
> 'nop's.

Nevermind that, we are looking at flags, not register.

-boris
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