Re: [Qemu-devel] [PATCH v2] hmp: allow cpu index for "info lapic"

["Dr. David Alan Gilbert" <dgilbert@redhat.com>]

* Eduardo Habkost (ehabkost@redhat.com) wrote:
> On Wed, Jul 19, 2017 at 12:47:53PM +0800, wang.yi59@zte.com.cn wrote:
> > Hi Eduardo,
> > 
> > Thank you for your reply!
> > 
> > >On Mon, Jul 17, 2017 at 09:49:37PM -0400, Yi Wang wrote:
> > >> Add [vcpu] index support for hmp command "info lapic", which is
> > >> useful when debugging ipi and so on. Current behavior is not
> > >> changed when the parameter isn't specified.
> > >> 
> > >> Signed-off-by: Yi Wang <wang.yi59@zte.com.cn>
> > >> Signed-off-by: Yun Liu <liu.yunh@zte.com.cn>
> > >
> > 
> > >We have 8 monitor commands (see below) that use the CPU set by
> > >the "cpu" command (mon_get_cpu()) as input.  Why is "info lapic"
> > >special?
> > 
> > When we debugging a problem of ipi, we wanted to verify lapic info
> > on each vCPU, but we found that we could only get vCPU 0's lapic
> > through "info lapic", so we supposed this patch could help those
> > who have the same problem as us.
> 
> The "cpu" command is supposed to allow you to select the CPU for
> those commands.  Doesn't it work?

In the other arm to the thread Yi explained that they were driving
it via virsh qemu-monitor-command,  and I've just tried and it
doesn't seem to work; doing:

virsh  qemu-monitor-command --domain rhel6.8 --hmp --cmd "cpu 1"
virsh  qemu-monitor-command --domain rhel6.8 --hmp --cmd "info lapic"
dumping local APIC state for CPU 0

Dave

> -- 
> Eduardo
--
Dr. David Alan Gilbert / dgilbert@redhat.com / Manchester, UK