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

[Julien Grall <julien.grall@xxxxxxxxxx>]

On 26/07/14 22:24, Julien Grall wrote:
> On 26/07/14 21:26, Suriyan Ramasami wrote:
> > On Sat, Jul 26, 2014 at 10:58 AM, Julien Grall
> > <julien.grall@xxxxxxxxxx> wrote:
> > > On 26/07/14 17:02, Suriyan Ramasami wrote:
> > > > Hi Julien,
> > > >
> > > > On Sat, Jul 26, 2014 at 4:28 AM, Julien Grall <julien.grall@xxxxxxxxxx>
> > > > wrote:
> > > > > Hi Suriyan,
> > > > >
> > > > >
> > > > > On 26/07/14 08:26, Suriyan Ramasami wrote:
> > > > > > I also noticed that in some instances of "xl create" it does bring up
> > > > > > domU with 4 cpus as mentioned in the domU.cfg file, and in those
> > > > > > instances the domU boots up.
> > > > > >
> > > > > > Is this some kind of bug?
> > > > >
> > > > >
> > > > > We use PSCI to boot secondary CPUs. You may want to check the the PSCI
> > > > > call
> > > > > has effectively been issued for those VCPUs.
> > > > I shall check on this!
> > > > > Which Xen and Linux version are you using?
> > > > Xen is 4.5 dev (git clone git://xenbits.xen.org/xen.git)
> > > > Linux is 3.14 from hardkernel linux repository, branch:
> > > > odroid-3.14.y-linaro
> > >
> > > Can you try a Linux upstream? The error may come from the hardkernel
> > > linux.
> > Is this for domU?
> > For dom0, I do not have a working kernel for upstream for the XU. I
> > did try 3.16 samsung-next as well as mainline linux and the dts needs
> > to be worked upon (or so I think)
> I was talking about domU.
>
> > Using upstream for domU exhibits the same behavior.
> >
> > One out of roughly 10 creates succeeds (I can get console output).
> > In the cases that succeed, I do see that do_psci_cpu_on() gets called.
> > In the cases that domU does not boot up, the call to do_psci_cpu_on()
> > does not happen.
> Reading back one of your previous mail:
>
> "I have noticed that there is no ARM port of XEN having more than 2
> CPUs. Is that correct? I am mentioning this, cause with the XU, though
> I can bring up all 4 processors in XEN and in dom0, domU fails to make
> much boot progress when it is xl created. I am able to boot domU, if I
> restrict the dtb for dom0 to 2 CPUs."
>
> By "I restrict the dtb for dom0 to 2 CPUs", did you mean removing some
> CPUs in the device tree or using dom0_max_vcpus=2 on Xen command line?
I forgot a question. Does a guest with 1 VCPU is working fine? I can't 
fine any clue on your mails.
> 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.
--
Julien Grall

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