Cannot boot into Dom0 after reading vcpu_info in sched_credit

Cannot boot into Dom0 after reading vcpu_info in sched_credit

[amin.fallahi]

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Hi there
I need to access event channel mask and pending bits for a vcpu in
sched_credit.c. Thus I'm trying to get and print this info in runq_insert
using vcpu_info like this:
printk("\nhello %d %d
\n",vcpu_info(svc->vcpu,evtchn_upcall_mask),vcpu_info(svc->vcpu,evtchn_upcall_pending));

After compiling and resinstalling (of course without any errors) I reboot
my Dom0 but the machine does not boot with Xen and gets rebooted after
bootloader.
The same printk works without any problem when I use it in event_channel.c
to print those info.
So there are a few questions:
1. Any idea what is the reason of reboot and how to fix it?
2. Any idea how can I examine logs to find out the problem? Where and what
should I look for?
3. Any ideas to access per vcpu mask and pending bits in sched_credit.c
functions (e.g. runq_insert or runq_sort)
Thanks all

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Re: Cannot boot into Dom0 after reading vcpu_info in sched_credit

[Dario Faggioli]

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On Mon, 2015-10-26 at 17:28 +0000, amin.fallahi@gmail.com wrote:

> The same printk works without any problem when I use it in
> event_channel.c to print those info.
> So there are a few questions:
> 1. Any idea what is the reason of reboot and how to fix it?
> 2. Any idea how can I examine logs to find out the problem? Where and
> what should I look for?
>
You should setup a serial console. Have a look here:

http://wiki.xen.org/wiki/Xen_Serial_Console

Consider whether you need to pass the 'noreboot' parameter to Xen.

( http://xenbits.xen.org/docs/4.2-testing/misc/xen-command-line.html )

> 3. Any ideas to access per vcpu mask and pending bits in
> sched_credit.c functions (e.g. runq_insert or runq_sort)
>
Let's first see the logs.

Regards,
Dario
-- 
<<This happens because I choose it to happen!>> (Raistlin Majere)
-----------------------------------------------------------------
Dario Faggioli, Ph.D, http://about.me/dario.faggioli
Senior Software Engineer, Citrix Systems R&D Ltd., Cambridge (UK)


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