Re: [Xen-devel] Problems with latest unstable 1.3

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

The PCI- and IRQ-virtualisation is not quite there yet -- but hopefully
it will be in a couple of days.

Issues at the moment are:
 - probing and routing of device interrupt pins -> IRQs is broken.
 - passing of physical interrupts to guest OSes is untested and thus
   probably broken in some way or another.

I'm currently addressing all these problems.

 -- Keir

> I have been trying out the latest unstable with the new i/o and have found
> the following issue. I created a xen.gz with nodev=y set, and tried it out
> with all my devices in xenolinux.
> 
> The "machine" I am running on is "qemu", and it doesn't have emulation for
> PCI. Therefore xenolinux is doing its ideprobes independent of the pci ide
> code.
> It is calling the routine "probe_irq_on" in irq.c, and it is failing with
> the following messages:
> 
> ide: Assuming 50MHz system bus speed for PIO modes; override with idebus=xx
> Kernel panic: Failed to obtain physical IRQ 127
> 
> "Probe_irq_on" is used to enable ALL unallocated irqs, the caller code will
> then twig the device you are probing (in my case it is the ide drives for
> ide0 disk, and ide0 cdrom) - and then will record the irq that actually got
> the interrupt thus figuring out which irq belongs to which device.
> 
> The reasons it is failing seem to be the following:
> 1) The probe enables 127 physical IRQs (NR_PIRQS), but xen fails to bind any
> pirq > 63. This is because sched.h only defines pirq_to_evtchn with a size
> of 64
> 2) When I tried making that constant from 64->128, it still failed on IRQ 12
> (which I think was already allocated to another device).
> 
> I was able to get much much further by setting "ide0=0x1f0,0x3f6,14
> ide1=noprobe ide2=noprobe ide3=noprobe" on the command line. It still failed
> much later on with an MMU update failure. I am currently tracking that one
> down further before reporting it.
> 
> 
> Barry Silverman
> 
> 
> 
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