Re: [Xen-devel] [ARM:PATCH v1 1/1] Add Odroid-XU (Exynos5410) support

[Suriyan Ramasami <suriyan.r@xxxxxxxxx>]

Hello Julien,

On Mon, Jul 28, 2014 at 5:53 AM, Julien Grall <julien.grall@xxxxxxxxxx> wrote:
> Hi Suriyan,
>
> On 07/27/2014 07:12 PM, Suriyan Ramasami wrote:
>>>
>>>> I was wondering if dom0 is touching the physical CPUs by mistake (mainly
>>>> because we map some regions used to control them).
>>>> It might be worse to check that no cpufreq or power management is called
>>>> on DOM0 at any time.
>>>
>> I shall dig into this some more.
>> Thanks!
>
> I would give a try with:
>         - Xen: 2 CPUs
>         - DOM0: 1 VCPU
>         - Guest: 1 VCPU
>
> You can restrict the number of DOM0 VCPUs with dom0_max_vcpus=n where n
> is the number of VCPUs for DOM0.
>
> If it's not failing then the error is in Linux.
>
I did the above suggestion and I tried bringing up domU atleast 30
times. None of the attempts succeeded - domU gave no console output. I
also tried with a XEN compile with exynos5_specific_mapping not being
called for the Odroid-XU (don't know if this is of any relevance)

Does this imply the problem is with Xen 4.5 dev branch?

Relevant logs:
------------ 8< ------------
XEN:
...
(XEN) Command line: sync_console console=dtuart
dtuart=/serial@12C20000 earlyprintk=xen dom0_mem=512M dom0_max_vcpus=1
...
(XEN) Bringing up CPU1
(XEN) exynos5.c:126: Power: 0 status: 0
(XEN) exynos5.c:130: Waiting for power status to change to 3
(XEN) exynos5.c:138: Power status changed to 3!
(XEN) CPU 1 booted.
(XEN) Brought up 2 CPUs

DOM0:
...
[    0.000000] Kernel command line: console=hvc0 earlyprintk debug
clk_ignore_unused root=/dev/mmcblk0p2 rootwait rw
...
[    0.038352] Xen: initializing cpu0
[    0.038414] Setting up static identity map for 0x604940c8 - 0x60494114
[    0.039487] Brought up 1 CPUs
[    0.039496] SMP: Total of 1 processors activated.
[    0.039503] CPU: All CPU(s) started in SVC mode.

root@dom0:~/Debug# xl vcpu-list
Name                                ID  VCPU   CPU State   Time(s) CPU Affinity
Domain-0                             0     0    0   r--     123.3  all
domU2                                2     0    1   r--     670.9  all

And domU2's sample function from xenctx 2 is as follows: (domU2 is
linux mainline)
root@dom0:~/Debug# ./domUtrace.sh 2
0xc0054c74 do_raw_spin_unlock
0xc00085d0 gic_handle_irq
0xc006c670 tick_periodic
0xc00085d0 gic_handle_irq
0xc006789c get_xtime_and_monotonic_and_sleep_offset
0xc00085d0 gic_handle_irq
0xc0054a90 do_raw_spin_lock
0xc0021934 irq_exit
0xc00085d0 gic_handle_irq
0xc0054c60 do_raw_spin_unlock
0xc00455e8 calc_global_load
0xc00085d0 gic_handle_irq
0xc006175c cpu_needs_another_gp
0xc00085d0 gic_handle_irq
0xc003b1b8 hrtimer_run_queues
0xc00085d0 gic_handle_irq
----------- 8< ----------------

Thanks for all the pointers so far!

> Regards,
>
> --
> Julien Grall

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