From mboxrd@z Thu Jan  1 00:00:00 1970
From: Jeremy Fitzhardinge <jeremy@goop.org>
Subject: Re: Re: pv_ops dom0 USB fixed
Date: Thu, 11 Dec 2008 00:04:29 -0800
Message-ID: <4940C98D.6070004@goop.org>
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Todd Deshane wrote:
> On Wed, Dec 10, 2008 at 3:05 PM, Jeremy Fitzhardinge <jeremy@goop.org> 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