Xen devel - May 2009 - How to send inter-processor NMI in Xen on AMD machine?

Hello,

There is a very interesting problem to send the inter-processor NMI in
Xen on an AMD machine. After Xen booted up the SMP processors of the
AMD machine, I found that it is OK to send an NMI from CPU #1 to CPU
#0. But no NMI receives when sending NMI from CPU #0 to CPU #1.
Following the AMD specification, I uses the following statements to
send an NMI:

wait_for_icr_idle();
apic_write_around(APIC_ICR, APIC_DEST_ALLBUT | APIC_DM_NMI);

The about method works very well on many Intel machines. But it does
not work on AMD machine. Is there anyone that knows about it?

Regards,

Xiaodong Yi

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