Re: [RFC][PATCH 4/7] x86/debug: Move historical SYSENTER junk into exc_debug_kernel()

[Josh Poimboeuf]

On Thu, Aug 20, 2020 at 09:43:15AM -0700, Andy Lutomirski wrote:
> 
> 
> > On Aug 20, 2020, at 9:35 AM, peterz@xxxxxxxxxxxxx wrote:
> > 
> > On Thu, Aug 20, 2020 at 11:17:29AM -0500, Josh Poimboeuf wrote:
> >> On Thu, Aug 20, 2020 at 05:21:11PM +0200, peterz@xxxxxxxxxxxxx wrote:
> > 
> >>> qemu-gdb stub should eat the event before it lands in the guest
> >> 
> >> Are we sure about that?  I triggered the warning just now, stepping
> >> through the debug handler.
> > 
> > Not sure at all, that's what seemed reasonable, but since when did that
> > stop virt ;-)
> > 
> > Also, can you trigger that same with upstream? Because I suspect this
> > ought to tickle the old code too.
> 
> I’ve lost track of how many bugs QEMU and KVM have in this space.
> Let’s keep it as a warning, but a bug. But let’s get rid of the
> totally bogus TIF_SINGLESTEP manipulation.

By "but a bug", I assume you mean "not a bug" :-)

-- 
Josh