Re: [Xen-devel] Does Xen ARM utilize Trustzone somehow?

["karim.allah.ahmed@xxxxxxxxx" <karim.allah.ahmed@xxxxxxxxx>]

Hi Andrei,

I think Xen ARM doesn't utilize Trustzone and you can't run Dom0 in secure mode. In a trustzone environment that supports virtualization, the hypevisor as well as all its guests will be running in the non-secure mode.

"The virtualization features accessible only at PL2 are implemented only in Non-secure state. Secure state has only two privilege levels, PL0 and PL1." ~ ARMv7 TRM.

Things like VTTBR aren't banked and are only available in non-secure. This register is currently used for MMU virtualization for guests.

On Mon, Dec 23, 2013 at 12:01 PM, Andrei Zakharov <z-andrew@xxxxxxxxx> wrote:

Hi,

Does Xen ARM utilize Trustzone somehow? Can Dom0 be in Trustzone?
On http://wiki.xenproject.org/wiki/Xen_ARM_with_Virtualization_Extensions/Arndale I read 'The bootloader provided with the Arndale does not let Xen boot in hypervisor mode, so we will use the u-boot provided by Linaro.'
Confusing moment...

Thanks.
Andrei.

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Karim Allah Ahmed.

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