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