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Re: [libvirt] [PATCH 2/3] add pci-brige device command line for qemu



在 2013-01-07一的 17:57 +0100,Ján Tomko写道:
> On 01/04/13 03:28, li guang wrote:
> > 在 2013-01-03四的 16:13 +0100,Ján Tomko写道:
> >> On 12/26/12 02:00, liguang wrote:
> >>> @@ -1801,10 +1803,13 @@ qemuBuildDeviceAddressStr(virBufferPtr buf,
> >>>           * When QEMU grows support for > 1 PCI domain, then pci.0 change
> >>>           * to pciNN.0  where NN is the domain number
> >>>           */
> >>> -        if (qemuCapsGet(caps, QEMU_CAPS_PCI_MULTIBUS))
> >>> +        if (info->type == VIR_DOMAIN_DEVICE_ADDRESS_TYPE_PCIBRIDGE) {
> >>> +            virBufferAsprintf(buf, ",bus=pci-bridge%d", info->addr.pci.bus);
> >>> +        } else if (qemuCapsGet(caps, QEMU_CAPS_PCI_MULTIBUS)) {
> >>>              virBufferAsprintf(buf, ",bus=pci.0");
> >>
> >> Is there any way (or plan) to use more pci buses with QEMU other than
> >> with the pci bridges? If not, we could just name the bridges pci.%d. (If
> >> we index the bridges from 1).
> > 
> > as far as I know, qemu can't use multi-pci-bus,
> > so only pci.0 accepted now.
> > 
> >>
> >>> -        else
> >>> +        } else {
> >>>              virBufferAsprintf(buf, ",bus=pci");
> >>> +        }
> >>>          if (info->addr.pci.multi == VIR_DEVICE_ADDRESS_PCI_MULTI_ON)
> >>>              virBufferAddLit(buf, ",multifunction=on");
> >>>          else if (info->addr.pci.multi == VIR_DEVICE_ADDRESS_PCI_MULTI_OFF)
> >>> @@ -3455,6 +3460,32 @@ error:
> >>>      return NULL;
> >>>  }
> >>
> >>
> >>>  
> >>> +char *
> >>> +qemuBuildPCIbridgeDevStr(virDomainPCIbridgeDefPtr dev,
> >>> +                         qemuCapsPtr caps, int idx)
> >>> +{
> >>> +    virBuffer buf = VIR_BUFFER_INITIALIZER;
> >>> +
> >>> +    virBufferAsprintf(&buf, "pci-bridge,chassis_nr=1");
> >>
> >> The chassis number has to be unique for each bridge.
> > 
> > chassis number is not so important,
> > here, I just set all bridges in same chassis.
> >
> 
> 
> > Each bridge must have a unique chassis #.
> > You *must* set it to a value > 0.
> > I don't check that it is unique, just that it is >0.
> > If you make it non unique, guest will be confused.
> 
> http://lists.gnu.org/archive/html/qemu-devel/2012-02/msg02765.html

Oh, to be a little pedantic, please refer to PCI-TO-PCI BRIDGE
ARCHITECTURE SPECIFICATION, REV 1.2, page 146, as I said before,
'I just set all bridges in same chassis', that means, 1 main chassis(#0)
,1 expansion chassis(#1), maybe it seems strange, but It's not illegal.

of course, I will consider your advice to make it unique.

Thanks!

> 
> Jan

-- 
regards!
li guang



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