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

To: "Cui, Dexuan" <dexuan.cui@xxxxxxxxx>
Subject: Re: [Xen-devel] Secondary bus reset for VT-d device
From: "Neo Jia" <neojia@xxxxxxxxx>
Date: Fri, 29 Aug 2008 22:01:36 -0700
Cc: Ian Pratt <Ian.Pratt@xxxxxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxx, "Han, Weidong" <weidong.han@xxxxxxxxx>
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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,


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!

I would remember that if researchers were not ambitious
probably today we haven't the technology we are using!
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