Frequent reports about Xen unstable hanging on ARM boots

Frequent reports about Xen unstable hanging on ARM boots

[Lars Kurth]

Folks,

I just noticed a cluster of issues related to Xen unstable hanging on various ARM boards. See
* http://xenproject.org/help/questions-and-answers/dra7-j6-evm-xen-booting-issue.html
* http://xenproject.org/help/questions-and-answers/problem-with-dom0.html
* http://xenproject.org/help/questions-and-answers/running-xen-on-omap5.html

This may imply an underlying bug somewhere that may need to be looked into

Lars
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Re: Frequent reports about Xen unstable hanging on ARM boots

[Julien Grall]

(CC Chen for the omap port)

Hi Lars,

On 15/03/16 10:56, Lars Kurth wrote:
> Folks,
>
> I just noticed a cluster of issues related to Xen unstable hanging on various ARM boards. See
> * http://xenproject.org/help/questions-and-answers/dra7-j6-evm-xen-booting-issue.html

Xen seems to be stuck just after bringing up the secondary CPU. This 
would require further debug to find where Xen is stuck.

I don't have the board but I'm happy to give advice on which part to focus.

> * http://xenproject.org/help/questions-and-answers/problem-with-dom0.html
> * http://xenproject.org/help/questions-and-answers/running-xen-on-omap5.html

"(XEN) Freed 280kB init memory" is the last message printed by Xen 
before DOM0 is booting.

At this stage, the problem is usually specific to the board. I've looked 
at the wiki page, it is recommended to use upstream but doesn't provide 
a version which is known to work. Chen, do you remember which version of 
Linux is supposed to work on this board?

Regards,

-- 
Julien Grall

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Re: Frequent reports about Xen unstable hanging on ARM boots

[Chen Baozi]

On Tue, Mar 15, 2016 at 06:37:43PM +0000, Julien Grall wrote:
> (CC Chen for the omap port)
> 
> Hi Lars,
> 
> On 15/03/16 10:56, Lars Kurth wrote:
> >Folks,
> >
> >I just noticed a cluster of issues related to Xen unstable hanging on various ARM boards. See
> >* http://xenproject.org/help/questions-and-answers/dra7-j6-evm-xen-booting-issue.html
> 
> Xen seems to be stuck just after bringing up the secondary CPU. This would
> require further debug to find where Xen is stuck.
> 
> I don't have the board but I'm happy to give advice on which part to focus.
> 
> >* http://xenproject.org/help/questions-and-answers/problem-with-dom0.html
> >* http://xenproject.org/help/questions-and-answers/running-xen-on-omap5.html
> 
> "(XEN) Freed 280kB init memory" is the last message printed by Xen before
> DOM0 is booting.
> 
> At this stage, the problem is usually specific to the board. I've looked at
> the wiki page, it is recommended to use upstream but doesn't provide a
> version which is known to work. Chen, do you remember which version of Linux
> is supposed to work on this board?

Upstream kernel should work for OMAP5 since the wiki has been wrote.

I can't remember the exact upstream linux version which started to fully support
my OMAP5 uEVM board. Just check my old source tree, where v3.11 is the version I
worked on for the last time.

Cheers,

Baozi.

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Re: Frequent reports about Xen unstable hanging on ARM boots

[Lars Kurth]

Julien,  Bao,

thanks for responding so quickly.

(CC'ing Paul and Doug)

> On 15 Mar 2016, at 18:37, Julien Grall <julien.grall@arm.com> wrote:
> 
> On 15/03/16 10:56, Lars Kurth wrote:
>> Folks,
>> 
>> I just noticed a cluster of issues related to Xen unstable hanging on various ARM boards. See
>> * http://xenproject.org/help/questions-and-answers/dra7-j6-evm-xen-booting-issue.html
> 
> Xen seems to be stuck just after bringing up the secondary CPU. This would require further debug to find where Xen is stuck.
> 
> I don't have the board but I'm happy to give advice on which part to focus.

@Paul: I remember that you guys are using Jacinto boards. You may want to double check quickly, whether this affects you also. If it is a bug that has been introduced recently, it be good to get it resolved before the next release.

@Doug, you mentioned on IRC that you see a similar issue on a board which worked before. What board are you using?

Lars 
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Re: Frequent reports about Xen unstable hanging on ARM boots

[Paul Sujkov]

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Thanks Lars,

we're not using 4.7-unstable at the moment, but we'll check this asap.

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Re: Frequent reports about Xen unstable hanging on ARM boots

[Paul Sujkov]

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Hi,

linking in Iurii, who did an investigation of this issue from our side.

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Re: Frequent reports about Xen unstable hanging on ARM boots

[Юрій Коноваленко]

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Hi, Lars!

We've just verified current master (Xen 4.7-unstable) on our DRA7 setup.
Everything works fine, issue is not reproduced.

There are a lot of strange things in this setup:
1. It seems like there are problems with UART driver detection in Xen. It
is because of incorrect command line:
(XEN) Command line: sync_console console=uart dtuart=uart1
According to wiki must be "sync_console console=dtuart dtuart=serial2".
I see setuping it in u-boot:
U-Boot# setenv xen_bootargs 'sync_console console=dtuart dtuart=serial2'
U-Boot# fdt set /chosen xen,xen-bootargs \"$xen_bootargs\"
But as you can see it doesn't work.
2. We have for our DRA7 setup console on serial0, not serial2. Is it right
to use serial2 for that setup?
3. Xen starts not in Hypervisor mode, nad switches to this mode:
- NOT HYP, setting it ... -
- Xen starting in Hyp mode -
As far as I know, this functionality is moved to u-boot, I can't see this
code in master branch.
So, are there any additional patches over mainline?
18 марта 2016 г. 19:21 пользователь "Paul Sujkov" <psujkov@gmail.com>
написал:

> Hi,
>
> linking in Iurii, who did an investigation of this issue from our side.
>

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