Re: [XenARM] Cannot create mini-os guest for arm64

[Ian Campbell <ian.campbell@xxxxxxxxxx>]

On Fri, 2013-05-17 at 17:58 +0800, Chen Baozi wrote:
> On Fri, May 17, 2013 at 10:26:08AM +0100, Ian Campbell wrote:
> > On Fri, 2013-05-17 at 08:00 +0800, Chen Baozi wrote:
> > > On May 17, 2013, at 12:20 AM, Ian Campbell <Ian.Campbell@xxxxxxxxxx> 
> > > wrote:
> > > 
> > > > On Thu, 2013-05-16 at 23:34 +0800, Chen Baozi wrote:
> > > >> On May 16, 2013, at 10:41 PM, Ian Campbell <ian.campbell@xxxxxxxxxx> 
> > > >> wrote:
> > > >> 
> > > >>> On Thu, 2013-05-16 at 17:49 +0800, Chen Baozi wrote:
> > > >>>> Hi Ian,
> > > >>>> 
> > > >>>> I've done the basic interfaces/framework to pass mini-os build on 
> > > >>>> arm64,
> > > >>>> which still needs lots of implementation to work properly.
> > > >>>> 
> > > >>>> Then I tried to create the mini-os guest for arm64 on Fast Model 
> > > >>>> environment
> > > >>>> to drive the following porting. (I know it must not work at present, 
> > > >>>> but it
> > > >>>> would give some feedback through the test.) However, when I tried to 
> > > >>>> "xl
> > > >>>> create" the mini-os, it reported the following errors:
> > > >>> 
> > > >>> There are some issues with loading guests from ELF (rather than 
> > > >>> zImage)
> > > >>> kernels on ARM.
> > > >> Is it possible because of there is no arm64 "guest_type" of
> > > >> xc_dom_arch struct? I can only find "den-3.0-armv7l" guest_type
> > > >> related codes in libxc files.
> > > > 
> > > > Oh, yes, we haven't done arm64 guests yet... Sorry I forgot about this
> > > > before. Hrm, that does rather block you from doing arm64 mini-os.
> > > > 
> > > > I posted a series to allow 64-bit dom0 a while back but we are currently
> > > > frozen so it has been committed, but that's the obvious starting point
> > > > for 64-bit guest support.
> > > > 
> > > > I don't recall why you are looking at 64-bit minios rather than 32-bit,
> > > > is that an option? A lot of the code should end up common.
> > > I did plan to start the work on arm32 at the very beginning. But The
> > > only platform of cortex-a15 I've got is the samsung's chromebook. I
> > > tried hard to run Xen on it but didn't succeed in the end due to the
> > > lack of debug method. At the same time, I've got an chance getting
> > > involved in a arm64 project of our lab so it is easy to have a
> > > FastModel license, which at least is a debugable platform for my at
> > > present. 
> > 
> > You should be able to run arm32 guests on that platform.
> Ok, I'll try it next.
> 
> > 
> > > PS, I ordered an OMAP5 development board, but it is stilling on shipping. 
> > 
> > Which devboard did you go for?
> It is OMAP5432 uEVM from SVTronics.
> 
> BTW, I found I can only run Xen hypervisor of your arm-cross2 git branch on
> Fast Model. For the version built from xen mainline, the program would
> run to an unknown address after paging enabled. (more exactly, from the
> 'isb' instruction which in line 267 of arch/arm/arm64/head.S.)
> 
> Any ideas?

That ISB is effectively the point at which paging gets enabled.

I'm afraid I've not seen anything like that for a very long time, commit
56bbdea (which is pretty recent) works OK for me on both 32 and 64 bit
models.

What version of the model do you use? How are you invoking it?

Ian.


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