Re: [Xen-devel] [PATCH] pci-ioapic-0502.patch

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

On 6 May 2005, at 21:41, Patrick Scharrenberg wrote:

> Hi!
>
> Great! the system is booting now with ioapic enabled.
>
> acpi=off does not work for me now.
> The system boots, but then there are interrupt-timeouts from the sata
> and ethernet - controller.
> should I open another bugreport?
This is pretty much unsupportable -- if Xen has detected IOAPICs and 
started to initialise them, it is not really possible to go back to a 
full legacy PIC mode. If you want to boot 'acpi=off' then you need to 
add the 'ignorebiostables' option as a Xen boot parameter. This will 
prevent Xen from finding the IOAPIC and Xen+domain0 can both boot in 
blissful ignorance.
What is needed is 'acpi=' config option for Xen as well as XenLinux, 
and require the option to be set the same for both Xen and domain0 (we 
could enforce this at boot time by propagating the Xen parameter onto 
the domain0 command line). This is something I intend to implement 
after upgrading the apic/mpparse/acpi support in Xen to Linux-2.6 
equivalent (it's all currently based on Linux-2.4 source files).
> And I have another problem, see new post for "physdev_dom0_hide"
> Maybe it has something to do with this patch, too?
I haven't seen the post, but physdev_dom0_hide has had no effect since 
we applied the ACPI patch earlier this week. Currently we do not 
support device drivers outside domain0 (they have no way of safely 
accessing PCI space) so there is no point in supporting hiding of pci 
devices from dom0 anyway. :-)
Getting support for driver domains back is a priority for the 3.0 
release.
 -- Keir


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