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From: Richard Purdie <richard.purdie@linuxfoundation.org>
To: Robert Yang <liezhi.yang@windriver.com>
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On Tue, 2017-11-28 at 20:48 +0800, Robert Yang wrote:
> Hi RP,
> On 11/28/2017 06:47 PM, Robert Yang wrote:
> > # Works
> > $ runqemu tmp/deploy/images/qemux86-64/ nographic snapshot
> > 
> > # Doesn't work, like hang:
> > $ runqemu tmp/deploy/images/qemux86-64/ nographic snapshot kvm
> I upgraded qemu-native to qemu-2.11.0-rc2, then no hangs any more. I
> dropped
> the conflicted patches during upgrade. I will send a formal upgrade
> tomorrow
> it this is acceptable.
> 
> Here is the draft patch for testing:
> 
>    git://git.openembedded.org/openembedded-core-contrib rbt/qemu_test
>    http://cgit.openembedded.org/openembedded-core-contrib/log/?h=rbt/
> qemu_test

Thanks for the data point. I've been putting my data into:

https://bugzilla.yoctoproject.org/show_bug.cgi?id=12301

As you can see there, I think there are actually two issues:

a) A boot hang around the ..TIMER line where the guest isn't getting
timer interupts

b) Something which causes the APIC to see "version 0".

I applied the 2.11-rc2 upgrade and it seemed to stop the hangs I was
seeing with "-no-kvm-irqchip" but doesn't stop the ones I see without
that.

I am seeing hangs in guests where the version 0 message appears as well
as where we see 0x14. The 0x14 versions do boot further into userspace
usually.

It also seems host hardware specific as I cannot get my local build
machine to hang as yet. That could mean its timing or could be cpu
revision, I've removed many but not all OS differences :/.

Cheers,

Richard