Re: [RFC][PATCH 5/5 v2] x86: Allow NMIs to hit breakpoints in i386

[H. Peter Anvin]

On 12/13/2011 06:52 PM, Steven Rostedt wrote:
> With i386, NMIs and breakpoints use the current stack and they
> do not reset the stack pointer to a fix point that might corrupt
> a previous NMI or breakpoint (as it does in x86_64). But NMIs are
> still not made to be re-entrant, and need to prevent the case that
> an NMI hitting a breakpoint (which does an iret), doesn't allow
> another NMI to run.

Okay... what about the other way around: avoiding the IRET when invoked
from an NMI context and therefore leaving NMI disabled until the
appropriate time?

	-hpa


-- 
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel.  I don't speak on their behalf.

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