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SubjectRe: [RFC][PATCH 4/7] x86/debug: Move historical SYSENTER junk into exc_debug_kernel()
On Thu, Aug 20, 2020 at 09:43:15AM -0700, Andy Lutomirski wrote:
>
>
> > On Aug 20, 2020, at 9:35 AM, peterz@infradead.org 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@infradead.org 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

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