Re: [PATCH v2 0/3] Fix and cleanup for 32-bit PV sysexit

From: Andy Lutomirski
Date: Thu Nov 19 2015 - 17:07:27 EST

On Thu, Nov 19, 2015 at 1:55 PM, Boris Ostrovsky
<boris.ostrovsky@xxxxxxxxxx> wrote:
> The first patch fixes Xen PV regression introduced by 32-bit rewrite. Unlike the
> earlier version it uses ALTERNATIVE instruction and avoids using xen_sysexit
> (and sysret32 in compat mode) pv ops, as suggested by Andy.
> As result of this patch irq_enable_sysexit and usergs_sysret32 pv ops are not
> used anymore by anyone and so can be removed.

This whole series is:

Acked-by: Andy Lutomirski <luto@xxxxxxxxxx>

Now I just have to sucker someone into getting rid of
PARAVIRT_ADJUST_EXCEPTION_FRAME (by using stub entries) and the
overcomplicated syscall entry stuff. :) And whoever gets rid of
PARAVIRT_ADJUST_EXCEPTION_FRAME gets to wonder why it doesn't crash
and burn for NMIs on Xen, since I'm reasonably confident that it can't
possibly be correct.

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