On Fri, Jul 05, 2013 at 11:30:01AM -0400, Jon Masters wrote: > On 07/05/2013 05:07 AM, Richard W.M. Jones wrote: > > On Wed, Jul 03, 2013 at 11:59:28AM -0500, Jon wrote: > >> I'm pleased to announce the availability of Fedora 19 for the 2012 Samsung > >> Chromebook featuring ARM Exynos dual core A15 processor. > > > > Sorry to slightly hijack this thread. I will try your remix later. > > > > Reading the comments on https://lwn.net/Articles/557132/#Comments > > it seems as if the news on KVM on the Chromebook is not good. It > > doesn't boot into HYP mode, and there's no way to make it boot into > > HYP mode, so KVM won't be supported. Is that right? > > That's roughly what I'd expect to be the case. There might be a signed > U-Boot someone has hacked that does enable HYP mode, but otherwise I > suspect you're out of luck. I'll ask around during Linaro Connect. I asked about this on #kvm-arm earlier today and got this long reply: 11:58 < rwmjones> I'm reading a comment here: 11:58 < rwmjones> https://lwn.net/Articles/557561/ 11:58 < rwmjones> which suggests that KVM on the Samsung Chromebook 2012 (ARM A15 version) isn't possible because the bootloader doesn't boot into HYP mode 11:58 < rwmjones> is this true? if so is there a way around it? 11:59 < pm215> IIRC the bootloader gets control in secure-SVC 11:59 < pm215> it is from there possible to get to NS-HYP 11:59 < pm215> it's just that the stock bootloader doesn't do this before booting the kernel 11:59 < rwmjones> so what's involved in making it work? 11:59 < pm215> somebody needs to write some code and get it into the bootloader 12:00 < rwmjones> ok, and the bootloader can be replaced (next comment down suggests this requires soldering)? 12:01 < pm215> I believe this to be true, though I don't have a chromebook 12:01 < pm215> I think you get the google bootloader to chain boot some other bootloader which you do have control of, and then that can actually boot your os 12:02 < suihkulokki> or maybe we could just prepend some code in front of the kernel zimage that switches to HYP mode? 12:02 < pm215> nope 12:02 < suihkulokki> damn 12:02 < pm215> we spent quite a long time being very firm that the ABI here is "bootloader's job to get this right" 12:03 < pm215> there are some u-boot patches currently going through code review to do the go-to-hyp-mode thing properly for arndale 12:03 < pm215> hopefully if they get upstream it will be more straightforward to say "ok, I have $other-board and it needs to do this too" 12:05 < apritzel> which would require that the Chromebook u-boot support is upstream as well 12:05 < apritzel> AFAIK this is not the case currently [There's more of this, but that seems to cover the main points] Reading around this, it does seem as if it's possible to get from secure SVC to HYP (although not easy). Rich. -- Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones virt-top is 'top' for virtual machines. Tiny program with many powerful monitoring features, net stats, disk stats, logging, etc. http://people.redhat.com/~rjones/virt-top _______________________________________________ arm mailing list arm@xxxxxxxxxxxxxxxxxxxxxxx https://admin.fedoraproject.org/mailman/listinfo/arm
