[Maverick] SRU: Reboot of linux-virtual hangs on EC2

[Stefan Bader]

On 03/02/2011 03:57 PM, Stefan Bader wrote:
> SRU Justification:
> 
> Impact: On reboot or shutdown the current Xen code does try to stop other
> CPUs. However the IPI communication is disabled already at that point.
> So issuing a reboot or shutdown from within an instance with multiple
> vcpus hangs.
> 
> Fix: Cherry pick of an upstream patch (added around 2.6.37) removes the
> attempt to stop other CPUs.
> 
> Testcase: From within an EC2 instance, call "sudo reboot". Instance never
> comes up again. With the patch applied it does.
> 
> -Stefan

Forgot to mention: this is also on the 2.6.35-longterm tree.