Re: [Qemu-devel] [PATCH v2 7/7] monitor: fix crash for platforms without a CPU 0

[David Gibson <david@gibson.dropbear.id.au>]

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On Tue, Sep 06, 2016 at 08:28:48AM +0200, Cédric Le Goater wrote:
> On 09/05/2016 06:27 AM, David Gibson wrote:
> > On Wed, Aug 31, 2016 at 06:34:15PM +0200, Cédric Le Goater wrote:
> >> On PowerNV, CPU ids start at 0x8 or 0x20, we don't have a CPU 0
> >> anymore. So let's use the first_cpu index to initialize the monitor.
> >>
> >> Signed-off-by: Cédric Le Goater <clg@kaod.org>
> > 
> > So we need a patch like this - amongst other fixes - in order to allow
> > unplug of cpu 0.  I'm not really sure whether to push it ahead now, or
> > gather it up with other no-cpu-0 fixes and send them as a batch.
> 
> I think we could send it now as it removes an assumption on the cpu 
> number.

True enough.  I'll try to queue it once I've sorted out my first 2.8
pull request with the existing backlog.

> 
> C. 
> 
> 
> > 
> >> ---
> >>
> >>  So that you can dump the cpu list with the monitor :
> >>
> >> 	(qemu) info cpus
> >> 	* CPU #8: nip=0x0000000000000010 thread_id=7742
> >> 	  CPU #16: nip=0x0000000000000010 thread_id=7740
> >> 	  CPU #24: nip=0x0000000000000010 thread_id=7740
> >> 	  CPU #32: nip=0x0000000000000010 thread_id=7740
> >> 	  CPU #40: nip=0x0000000000000010 thread_id=7740
> >> 	  CPU #48: nip=0x0000000000000010 thread_id=7740
> >> 	  CPU #72: nip=0x0000000000000010 thread_id=7740
> >> 	  CPU #80: nip=0x0000000000000010 thread_id=7740
> >> 	  CPU #136: nip=0x0000000000000010 thread_id=7740
> >> 	  CPU #144: nip=0x0000000000000010 thread_id=7740
> >> 	  CPU #152: nip=0x0000000000000010 thread_id=7740
> >> 	  CPU #160: nip=0x0000000000000010 thread_id=7740
> >> 	  CPU #168: nip=0x0000000000000010 thread_id=7740
> >> 	  CPU #176: nip=0x0000000000000010 thread_id=7740
> >> 	  CPU #200: nip=0x0000000000000010 thread_id=7740
> >> 	  CPU #208: nip=0x0000000000000010 thread_id=7740
> >>
> >>  monitor.c | 2 +-
> >>  1 file changed, 1 insertion(+), 1 deletion(-)
> >>
> >> diff --git a/monitor.c b/monitor.c
> >> index e9009de09a6c..19b8ec14f40e 100644
> >> --- a/monitor.c
> >> +++ b/monitor.c
> >> @@ -1027,7 +1027,7 @@ int monitor_set_cpu(int cpu_index)
> >>  CPUState *mon_get_cpu(void)
> >>  {
> >>      if (!cur_mon->mon_cpu) {
> >> -        monitor_set_cpu(0);
> >> +        monitor_set_cpu(first_cpu->cpu_index);
> >>      }
> >>      cpu_synchronize_state(cur_mon->mon_cpu);
> >>      return cur_mon->mon_cpu;
> > 
> 

-- 
David Gibson			| I'll have my music baroque, and my code
david AT gibson.dropbear.id.au	| minimalist, thank you.  NOT _the_ _other_
				| _way_ _around_!
http://www.ozlabs.org/~dgibson

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