RE: [Xen-devel] Secondary bus reset for VT-d device

["Cui, Dexuan" <dexuan.cui@xxxxxxxxx>]

I made some very basic tests manually... :-)
You can check tools/python/xen/xend/XendDomainInfo.py:do_FLR() to see when and 
how the do_secondary_bus_reset() is invoked.

-- Dexuan

Neo Jia wrote:
> Could you show me how to do the unit testing for the python function?
> Should it be called automatically by Xend or pciback driver?
> 
> It looks that I encountered some PCI cfg restore problem after the bus
> reset. BTW, inside the guest, we are still emulating a PCI-X system,
> right?
> 
> Thanks,
> Neo
> 
> On Fri, Aug 29, 2008 at 6:26 PM, Cui, Dexuan <dexuan.cui@xxxxxxxxx>
> wrote: 
>> What issue did you find?
>> I tested the python function do_secondary_bus_reset() on DQ35 and
>> don't find issues. 
>> 
>> You may add your log.debug(...) (the output is at
>> /var/log/xen/xend.log) to tools/python/xen/xend/server/pciif.py and
>> tools/python/xen/util/pci.py to debug the issue you found.  
>> 
>> BTW, can you try the latest xen-unstable.hg (like 18407:
>> c503269192f2) to see if your issue is still there? 
>> 
>> -- Dexuan
>> 
>> 
>> -----Original Message-----
>> From: Neo Jia [mailto:neojia@xxxxxxxxx]
>> Sent: 2008年8月30日 7:26
>> To: Cui, Dexuan
>> Cc: Ian Pratt; xen-devel@xxxxxxxxxxxxxxxxxxx; Han, Weidong
>> Subject: Re: [Xen-devel] Secondary bus reset for VT-d device
>> 
>> I just tried it on my Q35 board. It looks that there is something
>> wrong with the secondary bus reset, but I can't get log to prove it.
>> 
>> So, anybody test it on Q35 board? Or, how to debug it?
>> 
>> Here is the tip I am using:
>> 
>>> hg tip
>> changeset:   18387:6c50c7d089d9
>> tag:         tip
>> user:        Keir Fraser <keir.fraser@xxxxxxxxxx>
>> date:        Wed Aug 27 15:16:13 2008 +0100
>> summary:     hvmloader: Fix e820_malloc() after bug I introduced in
>> c/s 18383 
>> 
>> Thanks,
>> Neo
>> 
>> 2008/8/29 Cui, Dexuan <dexuan.cui@xxxxxxxxx>:
>>> Hi Ian,
>>> Yes, I'm moving it to the pciback driver.
>>> 
>>> Thanks,
>>> -- Dexuan
>>> 
>>> 
>>> -----Original Message-----
>>> From: Ian Pratt [mailto:Ian.Pratt@xxxxxxxxxxxxx]
>>> Sent: 2008年8月29日 16:15
>>> To: Cui, Dexuan; Neo Jia; xen-devel@xxxxxxxxxxxxxxxxxxx
>>> Cc: Han, Weidong; Ian Pratt
>>> Subject: RE: [Xen-devel] Secondary bus reset for VT-d device
>>> 
>>>> Yes. When FLR-ing device, if the device lacks proper FLR capability
>>>> (PCIe FLR, PCI Advanced Capabilities or ssomething), we will try
>>>> SecondaryBusReset. Currently the FLR is done in xend.
>>> 
>>> Now that 3.3 is out, are we going to move the FLR functionality
>>> from xend to blkback as per the email discussion a couple of months
>>> ago?  
>>> 
>>> Thanks,
>>> Ian
>>> 
>>> 
>> 
>> 
>> 
>> --
>> I would remember that if researchers were not ambitious
>> probably today we haven't the technology we are using!


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