[Qemu-devel] seek help for AER

[Qemu-devel] seek help for AER

[Cao jin]

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?

The topology is my host is:

+-09.0-[06]--+-00.0 Intel Corporation 82576 Gigabit Network Connection
| \-00.1 Intel Corporation 82576 Gigabit Network Connection

-- 
Sincerely,
Cao jin

Re: [Qemu-devel] seek help for AER

[Alex Williamson]

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

Re: [Qemu-devel] seek help for AER

[Cao jin]

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