Messages in this thread | | | Date | Wed, 14 Dec 2011 10:26:41 -0800 | From | "H. Peter Anvin" <> | Subject | Re: [RFC][PATCH 5/5 v2] x86: Allow NMIs to hit breakpoints in i386 |
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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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