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

[cyberhawk001@xxxxxxxxx]

I know, i know, sorry my mistake, I was replying too fast and hit the 
wrong reply button... :)
OK well thanks Ian, than answers that question... i appreciate it as always.



On 6/13/2012 9:58 AM, Ian Campbell wrote:
> (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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