[PATCH], issue EOI to APIC prior to calling crash_kexec in die_nmi path

H. Peter Anvin hpa at zytor.com
Wed Feb 6 15:21:30 EST 2008

Neil Horman wrote:
> Can an APIC accept an NMI while already handling an NMI?  I didn't think they
> would interrupt one another, but rather, pend until such time as the previous
> NMI was cleared

The CPU certainly won't (there is a hidden flag that's cleared on IRET 
which disables NMI; it's possible to re-enable NMI by executing a dummy 
IRET inside the NMI handler.)


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