Re: [Xen-users] Call schedule set on arinc653 scheduler?

[Robert VanVossen <robert.vanvossen@xxxxxxxxxxxxxxx>]

Hello,

On 5/28/2015 11:56 AM, Mr Idris wrote:
> On 5/6/15, Mr Idris <mr@xxxxxxxxxxxx> wrote:
>> On 5/6/15, Robert VanVossen <robert.vanvossen@xxxxxxxxxxxxxxx> wrote:
>>>
>>>
>>> On 5/6/2015 9:18 AM, Ian Campbell wrote:
>>>> On Wed, 2015-05-06 at 15:06 +0200, Mr Idris wrote:
>>>>> I'm using xen 4.4.1 with arinc653 scheduler. dom0 runs well, but i
>>>>> can't run domU. On wiki page, it is said that to usage arinc653
>>>>> scheduler (http://wiki.xen.org/wiki/ARINC653_Scheduler) point no.5,
>>>>> "call the arinc653_schedule_set API with an ARINC653 scheduler
>>>>> structure"
>>>>>
>>>>> How do i call this?
>>>>
>>>> It is a function in libxenctrl.so
>>>>
>>>>>  What command should i do?
>>>>
>>>> I'm afraid it looks like there is no tool which actually calls it. I
>>>> think you might have to write a little main.c.
>>>>
>>>> In fact, I see now that there are example programs on the wiki page you
>>>> linked to.
>>>>
>>> That is correct. You should be able to follow the idea behind the
>>> examples,
>>> but
>>> you need to configure any values for your specific domains and schedule.
>>>
>>
>> Thanks for the reply but i still don't get it. I tried to compile the
>> examples, but i got some errors.
>>
>> I know i have to provide UUID that i get from xenstore-ls. Should i
>> include in config file also or when i call this schedule_set?
>>
>> Regards,
>> Idris
>>
> I write small program to call arinc653, it gives me no error when i
> compiled with parameter -lxenctrl and -luuid. When i run it, it works
> fine like i set variable to xc_sched_xfair_schedule_set(xci, 0,
> &sched); and when it's correct will give true. But still when i check
> 'xl list' still no state running on VM.
> 
> Name                                        ID   Mem VCPUs      State   
> Time(s)
> Domain-0                                     0  6258     1     r-----     
> 370.1
> Debian                                       3   512     1     ------       
> 0.0
> 
> Here is the arinc653_schedule_set
> 
> #include <stdio.h>
> #include <xenctrl.h>
> #include <uuid/uuid.h>
> 
> int main()
> {
>         struct xen_sysctl_arinc653_schedule sched;
>         xc_interface *xci = xc_interface_open(NULL, NULL, 0);
>         int i;
> 
>         /* initialize major frame and number of minor frames */
>         sched.major_frame = 0;
>         sched.num_sched_entries = 2;
> 
>         uuid_parse("", sched.sched_entries[0].dom_handle);

I believe that dom0 is hanging because of this line. I believe this is returning
an error and not setting sched.sched_entries[0].dom_handle.

Try the following instead:

char *dom0_str;
*dom0_str = '\0';

strncpy((char *)sched.sched_entries[0].dom_handle,
        dom0_str,
        sizeof(sched.sched_entries[0].dom_handle));

>         sched.sched_entries[0].vcpu_id = 0;
>         sched.sched_entries[0].runtime = 10;
>         sched.major_frame += sched.sched_entries[0].runtime;
> 
>         uuid_parse("938b9c5b-8d9d-402a-9be0-0e0cc4cf67dc",
> sched.sched_entries[1].dom_handle);
>         sched.sched_entries[1].vcpu_id = 0;
>         sched.sched_entries[1].runtime = 10;
>         sched.major_frame += sched.sched_entries[1].runtime;
> 
>         i = xc_sched_arinc653_schedule_set(xci, 0, &sched);
>         if (i)
>         {
>                 printf("true\n");
>         } else {
>                 printf("false\n");
>         }
>         return 0;
> }
> 
> interestingly when i run this program suddenly the dom0 hang but when
> i make num_sched_entries bigger than 2, it runs and give me true
> message.
> 
xc_sched_arinc653_schedule_set will return less than 0 when there is an error,
so when you are printing true, it is actually probably an error. In the case
where you set num_sched_entries bigger than 2, it returns an error because you
don't specify enough sched_entries.

> Does anyone have any idea what change I need to make to get the scheduler to 
> run
> the VM?  I appreciate the help.
> 
> Thanks,
> Idris
> 

Thanks,
Robbie VanVossen

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