Re: [Xen-devel] Re: [PATCH] SMP dom0 boot fix

[Ryan Harper <ryanh@xxxxxxxxxx>]

* Keir Fraser <Keir.Fraser@xxxxxxxxxxxx> [2005-10-28 10:41]:
> 
> On 28 Oct 2005, at 16:15, Keir Fraser wrote:
> 
> >
> >On 28 Oct 2005, at 15:59, Ryan Harper wrote:
> >
> >>At this point send_IPI_allbutself() has been invoked and the system
> >>just sits and waits on CPU1 to run the function.  But, CPU1's
> >>evtchn_upcall_mask was set (1), so I'm guessing the pending interrupt
> >>is never acknowledged.
> >
> >Okay, the good news is that's the same bug I was able to repro last 
> >week. Turns out that CPU1's upcall mask is getting weirdly set under 
> >its feet. Since it's waiting on the big kernel lock, which is held by 
> >CPU0, which is waiting for acknowledgement of an interrupt in CPU1, we 
> >have a deadlock.
> >
> >Given the problem is in that one changeset, this can't be hard to 
> >track down now.
> 
> Now fixed in our staging tree. sizeof_vcpu_shift in 
> arch/xen/x86_64/xen_entry.S should be 4, not 3.

That fixed it for me here.  Thanks!

-- 
Ryan Harper
Software Engineer; Linux Technology Center
IBM Corp., Austin, Tx
(512) 838-9253   T/L: 678-9253
ryanh@xxxxxxxxxx

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