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

[H. Peter Anvin]

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.)

	-hpa