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

[Mr Idris <mr@xxxxxxxxxxxx>]

Hi,
On 5/28/15, Nathan Studer <nate.studer@xxxxxxxxx> wrote:
>> 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
>>
>
> Are you sure you have the Debian VM's UUID right?  Can you run "xl
> list -v" to confirm the UUID below?
>
here is "xl list -v"

Name                                        ID   Mem VCPUs      State
 Time(s)   UUID                            Reason-Code   Security
Label
Domain-0                                     0  6771     1     r-----
   176.2 00000000-0000-0000-0000-000000000000        -
-
Debian                                       3   512     1     ------
     0.0 938b9c5b-8d9d-402a-9be0-0e0cc4cf67dc        -
-

>> 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);
>
> uuid_parse fails when given a null string, so
> sched.sched_entries[0].dom_handle is likely junk.  You can use
> uuid_clear(sched.sched_entries[0].dom_handle) instead to set this
> handle to the NULL string.
>
>>         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");
>>         }
>
> Your print statement is somewhat misleading here, since
> xc_sched_arinc653_schedule_set returns 0 on success and something else
> on failure not true/false.
>
>>         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.
>
> If sched.sched_entries[0].dom_handle has junk, it will hang because
> dom0 does not have a slice.
>
> If the only thing that you are changing is num_sched_entries than it's
> unlikely that the schedule you are loading is valid, which would
> result in the schedule being rejected and an error being returned.
> The "true" output would seem to confirm this.
>
>      Nate
>
>>
>> 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
>>
>> _______________________________________________
>> Xen-users mailing list
>> Xen-users@xxxxxxxxxxxxx
>> http://lists.xen.org/xen-users
>

I tried using 'uuid_clear(sched.sched_entries[0].dom_handle);' or
'uuid_parse("00000000-0000-0000-0000-000000000000",
sched.sched_entries[0].dom_handle);' both make computer hang.

I also tried using 'strncpy((char *)sched.sched_entries[0].dom_handle,
dom0_str, sizeof(sched.sched_entries[0].dom_handle));' it gives me
nothing either computer hang or message true/false or VM run.
Yes, thank you. My mistake about return value
xc_sched_arinc653_schedule_set and num_sched_entries. I changed to
'if(!i)'.

Thanks,
Idris

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