Re: [Qemu-devel] seek help for AER

[Cao jin <caoj.fnst@cn.fujitsu.com>]

On 02/22/2017 12:07 AM, Alex Williamson wrote:
> On Tue, 21 Feb 2017 18:21:53 +0800
> Cao jin <caoj.fnst@cn.fujitsu.com> wrote:
> 
>> Hi,
>>
>> First, sorry for such a long time delay on the AER job. I was on 12 days
>> holiday, and start to work on the patch 2 weeks ago, because I use a
>> newer version kernel(4.10 rc8) to start off the work, several tiny
>> problems slow me.
>>
>> Now I meet a confusing issue on aer_inject module. When I use aer_inject
>> command before, it says:
>>
>>     Error: Failed to write, No such device
>>
>> then in dmesg, it says:
>>
>>     pcieport 0000:00:09.0: aer_inject: AER device not found
>>
>> and then I add some debug line in find_aer_device_iter() to check
>> device->bus-name, find that it is "pci", so that is why I can't inject,
>> it should have been "pci_express". But everything is same as before
>> except a newer host kernel.
>>
>> I still don't have a clue on this problem for almost 2 days, could you help?
> 
> If it only happens with a new host kernel, I would suggest finding a
> kernel where it works and bisecting between working and non-working
> kernels to find the commit that introduced the change.  You may have
> found a regression in the kernel that should be reported upstream.
> Thanks,
> 
> Alex
> 

Finally find the reason, I missed a kernel command line parameter
pcie_ports=native. Sorry for the noise.

It seems when make install the kernel, it will blow away the content of
old grub.cfg, so that I cannot check the parameters used in previous kernel.

-- 
Sincerely,
Cao jin