Re: [Xen-devel] Re: pv_ops dom0 USB fixed

[Jeremy Fitzhardinge <jeremy@xxxxxxxx>]

Todd Deshane wrote:
> On Wed, Dec 10, 2008 at 3:05 PM, Jeremy Fitzhardinge <jeremy@xxxxxxxx> wrote:
>   
> > Ian Campbell noticed a missing TLB flush which was causing the USB
> > crashes/failures when booting the pvops dom0 kernel.  With that fixed,
> > enabling USB boots reliably and seems to work.
> >
> > Its quite possible this will also improve matters with ATA/SATA controllers,
> > though I haven't tested it so far.
> >
> > Anyway, its a significant fix and its worth trying the current pvops patch
> > queue again.  Please tell me what you find.
> >
> >     
> Looks like some progress has been made.
>
> Two logs attached.
>
> The first, with both CPUs enabled give a pretty hard crash.
> (Maybe some indication of an SMP problem)
>
> The second, with nosmp on the dom0 kernel command line
> sitll doesn't fully boot, but look like it picks up the device, just
> that it is picking it up late maybe.
>
>
> Notice toward the end of boot that it goes to a busybox
> shell:
>
> "ALERT! /dev/sda1 does not exist. Dropping to a shell!
>
>
> BusyBox v1.10.2 (Ubuntu 1:1.10.2-1ubuntu6) built-in shell (ash)
> Enter 'help' for a list of built-in commands.
>
> (initramfs)"
>
> Then ATA stuff that keeps trying...
>   
Well, for a start, disable MSI for now (pci=nomsi on the kernel command 
line).  I haven't done any MSI support yet.
In the nosmp boot, something seems amiss with interrupt routing.  nomsi 
may help there as well, but I'll need to have a closer look at the code 
to work out what's really going wrong here.  Hm, its probably:
[    0.000000] ACPI: Skipping IOAPIC probe due to 'noapic' option.

I guess nosmp implies noapic?  Anyway, we don't do well without ioapics 
at present...
   J

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