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xen-devel
Re: [Xen-devel] xen_emul_unplug on xen 4.1, HVM guest 2.6.38
On Wed, Oct 26, 2011 at 02:17:25PM +0100, Alex Bligh wrote:
> I am running Xen 4 and want users to be able to install arbitrary HVM
> images. We want both PV and emulated drivers to appear. The reason
> for this is for compatibility with images that were prepared for
> Xen 3.3, which assume emulated devices exist at boot time (particularly
> for running the boot loader).
>
> If I do not specify on the boot line xen_emul_unplug=never, then
> under some guest OS's (e.g. Ubuntu Natty (2.6.38)), the domU kernel
> unplugs the non-PV devices, which is undesirable in my application.
>
> I cannot arbitrarily change the kernel command line because it is
> in effect set by the user's image.
>
> Therefore what I need to do is prevent Xen4 offering the facility
> to unplug the devices in the first place. Setting "(unpluggable 0)"
> in the config for the emulated NICs and disks does not appear
> to prevent them getting unplugged; what may be happening is that
> domU tries to unplug them (but fails) but still doesn't use them.
> Is there a way to signal from dom0 that the kernel really shouldn't
> unplug this stuff.
xen_pci_platform=0 in your guest config should do it.
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- [Xen-devel] xen_emul_unplug on xen 4.1, HVM guest 2.6.38, Alex Bligh
- Re: [Xen-devel] xen_emul_unplug on xen 4.1, HVM guest 2.6.38,
Konrad Rzeszutek Wilk <=
- Re: [Xen-devel] xen_emul_unplug on xen 4.1, HVM guest 2.6.38, Pasi Kärkkäinen
- Re: [Xen-devel] xen_emul_unplug on xen 4.1, HVM guest 2.6.38, Alex Bligh
- Re: [Xen-devel] xen_emul_unplug on xen 4.1, HVM guest 2.6.38, Ian Campbell
- Re: [Xen-devel] xen_emul_unplug on xen 4.1, HVM guest 2.6.38, Stefan Bader
- Re: [Xen-devel] xen_emul_unplug on xen 4.1, HVM guest 2.6.38, Stefano Stabellini
- Re: [Xen-devel] xen_emul_unplug on xen 4.1, HVM guest 2.6.38, Stefan Bader
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