Re: [Xen-users] Which QEMU device-model to use for Windows HVM guests???

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

(adding the list back to the CC)

On Wed, 2012-06-13 at 14:43 +0100, cyberhawk001@xxxxxxxxx wrote:
> On 6/13/2012 9:31 AM, Ian Campbell wrote: 
> > On Wed, 2012-06-13 at 14:24 +0100, cyberhawk001@xxxxxxxxx wrote:
> > > Just wondering about which QEMU version to use. Looking in the xl.cfg 
> > > MAN page, you can choose from "qemu-xen-traditional" or  "qemu-xen", 
> > > however i have seen a third one "qemu-dm" WHICH is not listed in the 
> > > xl.cfg man page.
> > > 
> > > I know the "qemu-xen-traditional" device-model is the default one as it 
> > > is more stable, compatible and so forth. The "qemu-xen" is the qemu 
> > > upstream one and i am sure still not so stable without tweaking, BUT 
> > > have read that f you want to use IOMMU (pci passthrough), than 
> > > "qemu-xen" doesn't have support or is buggy, or something like that. I 
> > > do want to use PCI passthrough so i guess that is not an option. 
> > > HOWEVER, i have read people use "qemu-dm" and don't know how different 
> > > is that compared to the other two choices.
> > qemu-dm is just an umbrella term for the device model, it's not a
> > specific version.
> 
> AHH OK i see. SO the qemu-dm is an umbrella term for what? If you
> specify that in the VM config file, what does Xen load? 

You can't specify it in the config file, it's just a word we use when we
mean either qemu-xen or qemu-xen-traditional. It's not a valid actual
value.

> I was curious since i saw this line in a VM config file somewhere:
> 
> device_model = "/usr/lib64/xen/bin/qemu-dm"

This is the path to the dm binary to use, you should never need to
specify this (any more, this wasn't true in 4.1 and xend)

"/usr/lib64/xen/bin/qemu-dm" happens to be the binary for
qemu-xen-traditional.

Ian.



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