* H. Peter Anvin <hpa at zytor.com> wrote: >> I am wondering if interrupts are disabled on crashing cpu or if >> crashing cpu is inside die_nmi(), how would it stop/prevent delivery >> of NMI IPI to other cpus. > > I don't see how it would. cross-CPU IPIs are a bit fragile on some PC platforms. So if the kexec code relies on getting IPIs to all other CPUs, it might not be able to do it reliably. There might be limitations on how many APIC irqs there can be queued at a time, and if those slots are used up and the CPU is not servicing irqs then stuff gets retried. This might even affect NMIs sent via APIC messages - not sure about that. Ingo
