Re: nmi is broken?

[Avi Kivity <avi@redhat.com>]

On 05/03/2011 12:36 PM, Avi Kivity wrote:
>
>> I don't know about live migration of kvm. If we said the wiring is like
>> figure 5-2, what is required for the live migration? It was required
>> only if IMCR was required?
>
> The issue with live migration is that we can't change the running 
> configuration while the system is running, like adding the IMCR or 
> changing the wiring.  The hardware will be programmed for the old 
> configuration and will likely fail with the new one.  For example, the 
> current wiring has the PIT output wired to PIC IRQ0 and IOAPIC INTI0; 
> we need to change it to IOAPIC INTI2 instead.
>

btw, I believe that the configuration currently implemented is legal 
(it's similar to config 7 in table 5-2 of the mpspec); the only problem 
is that it can't support the NMI watchdog through the I/O APIC trick, 
yet we allow it through a hack.

Something we can do is connect the 8259A output to the I/O APIC INTIN2; 
it should be masked so live migration will continue to work.  We just 
have to make sure that the guest is able to find that it is connected there.

-- 
error compiling committee.c: too many arguments to function