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Re: [Xen-devel] Windows HVM cannot auto reboot after cashdump with more

from [Tim Deegan]

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To:	S?nke Schwardt <schwardt@xxxxxxxxxxxxx>
Subject:	Re: [Xen-devel] Windows HVM cannot auto reboot after cashdump with more then 1 VCPU
From:	Tim Deegan <Tim.Deegan@xxxxxxxxxx>
Date:	Thu, 5 Mar 2009 14:20:19 +0000
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At 14:50 +0000 on 04 Mar (1236178249), S?nke Schwardt wrote:
> > ISTR Xen 3.1 didn't handle inter-vcpu NMIs properly, so multi-vcpu
> > windows guests would fail to shut down in some cases (where Windows was
> > using NMIs to halt its APs for restart); instead the guest would hang.
> 
> Is there any workaround on guest or host side? 

Not that I know of.  Upgrade to Xen 3.2? :)

> We can reproduce a hanging win2k3 guest on normal windows reboot if 4 vcpus 
> are used. The guest is switched off correctly after windows shutdown and 
> reboots without problem if only 2 vcpus are assigned to this guest.

Huh.  I would have expeceted it to use the same reboot code on all SMP
configurations.  But the ways of Windows are indeed strange.

Cheers,

Tim.

-- 
Tim Deegan <Tim.Deegan@xxxxxxxxxx>
Principal Software Engineer, Citrix Systems (R&D) Ltd.
[Company #02300071, SL9 0DZ, UK.]

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