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Re: [win-pv-devel] Using current xen pv drivers (Windows) on AWS



Yep, it appears to be a bug in Xenvif which has not been noticed before:

 

static FORCEINLINE VOID

__TransmitterRingUnmask(

    IN  PXENVIF_TRANSMITTER_RING    Ring

    )

{

    PXENVIF_TRANSMITTER             Transmitter;

 

    if (!Ring->Connected)

        return;

 

    Transmitter = Ring->Transmitter;

 

    XENBUS_EVTCHN(Unmask,

                  &Transmitter->EvtchnInterface,

                  Ring->Channel,

                  FALSE);

}

 

In the above there should be a check for FrontendIsSplit() being true before attempting the Unmask op.

 

Thanks for reporting this. I will post a fix shortly.

 

  Paul

 

 

From: Paul Durrant
Sent: 06 May 2016 09:17
To: 'Eytan Heidingsfeld'; win-pv-devel@xxxxxxxxxxxxxxxxxxxx
Subject: RE: [win-pv-devel] Using current xen pv drivers (Windows) on AWS

 

At a guess, I’d say that the backend doesn’t support split event channels and the frontend is not checking this before attempting to unmask a presumably non-existent evtchn?

Did you build the drivers yourself? If so, from what branch and when?

 

  Paul

 

From: win-pv-devel [mailto:win-pv-devel-bounces@xxxxxxxxxxxxxxxxxxxx] On Behalf Of Eytan Heidingsfeld
Sent: 05 May 2016 23:38
To: win-pv-devel@xxxxxxxxxxxxxxxxxxxx
Subject: [win-pv-devel] Using current xen pv drivers (Windows) on AWS

 

Hello,
I'm trying to use the most up-to-date xen drivers on AWS ec2. 
If using enhanced-networking everything works as planned, but trying to use xenvif/xennet causes a bugcheck

 

IRQL_NOT_LESS_OR_EQUAL

 

the stack is:

04 fffff801`99a28524 : 00000000`00000000 fffff802`e657b830 ffffe001`9a5551c8 ffffe001`9a553000 : xenbus!EvtchnUnmask+0x35 [c:\users\builder\documents\pvdrivers\xenbus\src\xenbus\evtchn.c @ 756]

05 (Inline Function) : --------`-------- --------`-------- --------`-------- --------`-------- : xenvif!__TransmitterRingUnmask+0x1f

06 fffff802`e4ccc130 : fffff802`e4f71f00 fffff802`e4dbd53e fffff802`e657bb10 ffffe001`9a553080 : xenvif!TransmitterRingDpc+0x2e4 [c:\users\builder\documents\pvdrivers\xenvif\src\xenvif\transmitter.c @ 3009]

Any idea why this is? Anyone else have this configuration working?

Thanks in advance,

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