Re: [Qemu-devel] [PATCH v3] libxl: usb2 and usb3 controller support for upstream qemu

[Paolo Bonzini]

Il 18/07/2013 14:31, Andreas Färber ha scritto:
>> > I'm just curious, why is this so complicated?  Is this likely to be
>> > fragile and break in the future?
> As pointed out previously, the bus=pci.0 bit will break with different
> PCI host bridges, such as the q35 machine existing today (-M q35 uses
> pcie.0 instead and it has been discussed to make q35 the default at some
> point). I had thus suggested to use a variable for the bus name to
> abstract it. For -M pc-i440fx-1.5 etc. pci.0 should continue to work.

I think if we ever made a PCIe machine the default, it would be
different from what today's q35.  In particular it probably should
include a default DMI-to-PCI bridge, so as to make the command line
compatible with i440FX-based machines.

Paolo