Trustzone with virt_qemu_arm_v8a

[Divya Sharma]

Thanks, MIchael for suggesting the another approach.

With the normal virtualization, do you mean the arm virtualization which
works at PL2? Do you mean we can achieve the same secured or normal
isolation level with normal virtualization as we would have achieved with
the Trustzone?As our main goal is to execute the normal application(
cryptographic
work) in the secure world compared to the normal world.
If yes, how can we achieve a normal and secure world in virtualization? Can
you provide any references or anything to achieve this from scratch if
possible?



Best,
Divya.

On Wed, Mar 1, 2023 at 4:52 PM Michael Grunditz <michael.grunditz at gmail.com>
wrote:

> On Wed, 1 Mar 2023 at 11:20, Stefan Kalkowski
> <stefan.kalkowski at genode-labs.com> wrote:
> >
> > Hello Divya,
> >
> > my colleague Norman raised the reasonable question, why don't you use
> > virtualization for your use-case instead of TrustZone? It is much more
> > appropriated, and already supported.
> >
> > Regards
> > Stefan
> >
> This is the only sensible option. As Stefan explained; it is very
> large amount of work to device
> some kind of secure vmm from scratch. It is possible to overwrite ATF
> and run "simple" functions
> from the new exception table.
>
> Another option is to use something I have tinkered with. I use a
> dedicated CPU core and since
> it is started without any EL switching it can run , in the background
> behind Genode, and can be kept
> secure. In order to communicate with it you probably need to do a
> exception vector for the CPU
> cores Genode runs on. When all is setup , you can message your crypto
> routines running on
> the dedicated CPU core by doing SVC calls and in the vector entries
> use the soc's mailboxing.
>
> But, *really*, "normal" virtualization is  the best option. Every
> other option requires a
> lot of assembly and would step away from Genodes software design.
>
> Regards,
> MIchael
>
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