Re: [PATCH 08/13] xen/pvticketlock: disable interrupts while blocking

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> If an NMI hits in an interrupt handler, or in the "after hlt" section 
> before the write-to-last-nmi-rip, then we'll see that %rip has changed.  
> If it hits after the write-to-last-nmi-rip instruction (or in the hlt 
> itself), then we'll also see that %rip has changed, due to the effect of 
> that instruction.

It won't handle multiple NMIs in halt. I assume that's reasonable common.

-Andi
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