Re: [PATCH v3 05/12] qemu: Auto add pci-root for s390/s390x guests

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On Thu, 16 Aug 2018 16:52:18 +0200
Andrea Bolognani <abologna@xxxxxxxxxx> wrote:

> On Tue, 2018-08-07 at 17:10 +0800, Yi Min Zhao wrote:
> > The pci-root depends on zpci capability. So autogenerate pci-root if
> > zpci exists.
> > 
> > Signed-off-by: Yi Min Zhao <zyimin@xxxxxxxxxxxxx>
> > Reviewed-by: Boris Fiuczynski <fiuczy@xxxxxxxxxxxxxxxxxx>
> > Reviewed-by: Stefan Zimmermann <stzi@xxxxxxxxxxxxx>
> > Reviewed-by: Bjoern Walk <bwalk@xxxxxxxxxxxxxxxxxx>
> > Reviewed-by: Ján Tomko <jtomko@xxxxxxxxxx>
> > ---
> >  src/qemu/qemu_domain.c | 1 +
> >  1 file changed, 1 insertion(+)
> > 
> > diff --git a/src/qemu/qemu_domain.c b/src/qemu/qemu_domain.c
> > index de056272e8..a84e5f06b2 100644
> > --- a/src/qemu/qemu_domain.c
> > +++ b/src/qemu/qemu_domain.c
> > @@ -3227,6 +3227,7 @@ qemuDomainDefAddDefaultDevices(virDomainDefPtr def,
> >      case VIR_ARCH_S390X:
> >          addDefaultUSB = false;
> >          addPanicDevice = true;
> > +        addPCIRoot = virQEMUCapsGet(qemuCaps, QEMU_CAPS_DEVICE_ZPCI);
> >          break;  
> 
> I wonder if you might want to do this, and other stuff, only if
> qemuDomainIsS390CCW()... It seems like that function is not used
> a lot, which might mean that someone is going to have to perform
> some serious cleaning up if there is ever another machine type
> on s390, or perhaps that it just doesn't quite apply here.

Not a libvirt person, but that other QEMU s390 machine type is long
gone (and was never supported in libvirt AFAIK anyway), and I don't see
any reason to add an additional s390 machine type to QEMU from where we
stand now.

> 
> If the latter,
> 
>   Reviewed-by: Andrea Bolognani <abologna@xxxxxxxxxx>
> 


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