Re: [win-pv-devel] Upcalls not enabled on a processor

[RafaÅ WojdyÅa <omeg@xxxxxxxxxxxxxxxxxxxxxx>]

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On 2015-06-23 00:59, RafaÅ WojdyÅa wrote:
> On 2015-06-22 00:44, RafaÅ WojdyÅa wrote:
>> Hi,
> 
>> I've been testing the full pvdrivers package under Qubes and I see 
>> this problem happening sometimes. It seems that xenvif waits
>> forever for backend state to change. Debug output seems to suggest
>> that something else is the real cause of the problem and xenvif is
>> just the first victim:
> 
>> XENVIF|FrontendAcquireBackend: =====> 
>> XENVIF|FrontendWaitForBackendXenbusStateChange: 
>> /local/domain/2/backend/vif/14/0: ====> Unknown 
>> XENBUS|StoreProcessWatchEvent: 55b5 
>> (/local/domain/2/backend/vif/14/0/state) 
>> XENVIF|FrontendWaitForBackendXenbusStateChange: 
>> /local/domain/2/backend/vif/14/0: <==== (Closed) 
>> XENVIF|FrontendSetXenbusState: device/vif/0: ====> Initialising 
>> XENBUS|StoreProcessWatchEvent: 5599 (device/vif/0/state) 
>> XENBUS|StoreProcessWatchEvent: 55af (device/vif/0/state) 
>> XENVIF|FrontendSetXenbusState: device/vif/0: <==== Initialising 
>> XENVIF|FrontendWaitForBackendXenbusStateChange: 
>> /local/domain/2/backend/vif/14/0: ====> Closed 
>> XENBUS|StoreProcessWatchEvent: 55b6 
>> (/local/domain/2/backend/vif/14/0/state) 
>> XENVIF|FrontendWaitForBackendXenbusStateChange: 
>> /local/domain/2/backend/vif/14/0: <==== (InitWait) 
>> XENBUS|StoreProcessWatchEvent: 55b7 
>> (/local/domain/2/backend/vif/14/0/online) XENVIF|FrontendPrepare:
>> <==== XENVIF|FrontendSetState: device/vif/0 in state 'PREPARED' 
>> XENVIF|FrontendConnect: ====> XENVIF|FrontendSetNumQueues: 2 
>> XENVIF|ReceiverConnect: ====> XENBUS|CacheCreate: ====>
>> (device_vif_0_queue-0_receiver_gnttab) XENBUS|CacheCreate: <==== 
>> XENBUS|EvtchnOpen: 9 XENBUS|EvtchnBind: fail1 (c00000bb) 
>> XENBUS|CacheCreate: ====> (device_vif_0_queue-1_receiver_gnttab) 
>> XENBUS|CacheCreate: <==== XENBUS|EvtchnOpen: 10 XENBUS|EvtchnBind:
>> fail1 (c00000bb) XENVIF|ReceiverConnect: <====
> 
>> EvtchnBind fails with STATUS_NOT_SUPPORTED and that's caused by 
>> upcalls not being enabled on the processor. What can be the cause
>> of this? EvtchnInterruptEnable is being called but apparently 
>> HvmSetEvtchnUpcallVector fails because I see no debug output that 
>> should be present if it succeeds. I guess I should check the 
>> hypervisor logs for any clues...
> 
> I've done some more testing and I'm even more confused. The hypervisor
> log doesn't show any relevant errors or other messages. Then if I
> don't install xenvif and xennet in my HVM, the problem goes away. I
> *think* the hang only occurs with a debug build but I need to verify t
ha
> t.
> 
> Also the "upcalls not enabled" error might be a red herring. I added
> some more diagnostic output to xen.sys and apparently this occurs even
> during normal HVM boot:
> 
> XENBUS|EvtchnInterruptEnable: ====>
> XEN|HvmSetEvtchnUpcallVector: errno -38
> XEN|HvmSetEvtchnUpcallVector: errno -38
> 
> Then again, during a normal boot (without xenvif/xennet) EvtchnBind
> doesn't fail anywhere...
> 
> I also noticed a lot of the following even during normal HVM operation
:
> XEN|HvmPagetableDying: errno -22
> ...but it's probably harmless?
> 
Ah, I guess this might be caused by not having this patch:

http://xenbits.xen.org/gitweb/?p=xen.git;a=commit;h=04447f4453c008b36c3e
3443f0fc44e66ddd821d

That would certainly explain "not implemented" errors :)
- -- 
RafaÅ WojdyÅa
Qubes Tools for Windows developer
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