[coreboot] VT-d on Pixel 2015 (samus)

[ron minnich]

what does rdmsr 0 0x3a show you?

ron

On Fri, Jul 24, 2015 at 10:06 PM Noah Vesely <fowlslegs at riseup.net> wrote:

> I've been trying to get VT-d working on John Lewis's build for the 2015
> Pixel (samus). You can see our conversation at
> https://plus.google.com/116173342884039282107/posts/TGA4EXYQMfq and I
> have also pasted it below. So far, I haven't got anywhere, so I thought
> I would try asking you all as well.
>
> Thanks,
> Noah
>
> &%$#&%$#&%$#&%$#&%$#&%$#&%$#&%$#&%$#
>
> Noah Vesely
>   -  Jul 16, 2015
>
> Is it possible to get Intel VT-d working on the Chromebook Pixel 2/
> Samus? The i7-5600U processor does support it.
> ARK | Intel® Core™ i7-5600U Processor (4M Cache, up to 3.20 GHz)
> ark.intel.com
> ARK | Intel® Core™ i7-5600U Processor (4M Cache, up to 3.20 GHz) quick
> reference guide including specifications, features, pricing,
> compatibility, design documentation, ordering codes, spec codes and more.
> John Lewis's profile photoNoah Vesely's profile photo
> 10 comments
> John Lewis
> Jul 18, 2015
>
>
>
>
> AFAIK, none of the hardware VT extensions are disabled in the firmware
> on Samus. Have you tried it?
> Noah Vesely
> Jul 18, 2015
>
>
>
>
> Yes. VT-x was enable while VT-d was not.
> John Lewis
> Jul 18, 2015
>
>
>
>
> Clone
>
> https://chromium.googlesource.com/chromiumos/third_party/coreboot/+/firmware-samus-6300.B
> and run menuconfig to see if there's an option for VT-d.
> Noah Vesely
> Jul 19, 2015
>
>
>
>
> I can't figure out how to checkout this repository. I cloned the main
> third_part/coreboot repo then checked out the broadwell branch, but
> could not find the same directory you linked. Maybe my git fu could use
> some work.
> John Lewis
> Jul 20, 2015
>
>
>
>
> Use the last chunk of the URL as the branch argument i.e. "-b
> firmware-samus-6300.B".
> Noah Vesely
> Jul 20, 2015
>
>
>
>
> Nothing in menuconfig, however, I found the line `#define CONFIG_IOMMU
> 0` in ./build/config.h. I also found `#define CONFIG_ENABLE_VMX 0`.
> John Lewis
> Jul 21, 2015
>
>
>
>
> VMX is already enabled in the firmware. IOMMU is unrelated. I would have
> to conclude that VT'd is either not supported by that CPU or something
> more needs to be done in coreboot to get it to work.
> Noah Vesely
> Jul 21, 2015
>
>
>
>
> VT-d is supported by this CPU. See original link to Intel Ark.
>
> VT-d is Intel's specification for their IOMMU technology, so I don't see
> how it's unrelated.
> John Lewis
> Jul 21, 2015
>
>
>
>
> Take a look at the .config from a shellball ROM (you can extract it
> using cbfstool).
>
> https://johnlewis.ie/extracting-the-shell-ball-rom-using-a-chromeos-image/
> 
> Noah Vesely
> 9:15 PM
>
>
>
>
> I don't see anything relevant to VT-d; no VT-d keywords (e.g., iommu,
> vt, vmx, hvm, and directio).
>
> http://paste.debian.net/hidden/08ac8494/
>
> --
> coreboot mailing list: coreboot at coreboot.org
> http://www.coreboot.org/mailman/listinfo/coreboot
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