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Re: [Qemu-devel] seek help for AER

From: Cao jin
Subject: Re: [Qemu-devel] seek help for AER
Date: Wed, 22 Feb 2017 14:31:18 +0800
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.1.0

On 02/22/2017 12:07 AM, Alex Williamson wrote:
> On Tue, 21 Feb 2017 18:21:53 +0800
> Cao jin <address@hidden> 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.

Cao jin

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