On Sat, Mar 05, 2016 at 09:52:22PM -0800, Andy Lutomirski wrote:
> Right after SYSENTER, we can get a #DB or NMI. On x86_32, there's no IST,
> so the exception handler is invoked on the temporary SYSENTER stack.
>
> Because the SYSENTER stack is very small, we have a fixup to switch
> off the sta
Right after SYSENTER, we can get a #DB or NMI. On x86_32, there's no IST,
so the exception handler is invoked on the temporary SYSENTER stack.
Because the SYSENTER stack is very small, we have a fixup to switch
off the stack quickly when this happens. The old fixup had several issues:
1. It che
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