[RFC] Support for Arm CCA VMs on Linux

[Itaru Kitayama]

On Sat, Feb 11, 2023 at 1:56 AM Ryan Roberts <ryan.roberts at arm.com> wrote:
>
> On 27/01/2023 11:22, Suzuki K Poulose wrote:
> > [...]
>
> > Running the stack
> > ====================
> >
> > To run/test the stack, you would need the following components :
> >
> > 1) FVP Base AEM RevC model with FEAT_RME support [4]
> > 2) TF-A firmware for EL3 [5]
> > 3) TF-A RMM for R-EL2 [3]
> > 4) Linux Kernel [6]
> > 5) kvmtool [7]
> > 6) kvm-unit-tests [8]
> >
> > Instructions for building the firmware components and running the model are
> > available here [9]. Once, the host kernel is booted, a Realm can be launched by
> > invoking the `lkvm` commad as follows:
> >
> >  $ lkvm run --realm                            \
> >        --measurement-algo=["sha256", "sha512"] \
> >        --disable-sve                           \
> >        <normal-vm-options>
> >
> > Where:
> >  * --measurement-algo (Optional) specifies the algorithm selected for creating the
> >    initial measurements by the RMM for this Realm (defaults to sha256).
> >  * GICv3 is mandatory for the Realms.
> >  * SVE is not yet supported in the TF-RMM, and thus must be disabled using
> >    --disable-sve
> >
> > You may also run the kvm-unit-tests inside the Realm world, using the similar
> > options as above.
>
> Building all of these components and configuring the FVP correctly can be quite
> tricky, so I thought I would plug a tool we have called Shrinkwrap, which can
> simplify all of this.
>
> The tool accepts a yaml input configuration that describes how a set of
> components should be built and packaged, and how the FVP should be configured
> and booted. And by default, it uses a Docker container on its backend, which
> contains all the required tools, including the FVP. You can optionally use
> Podman or have it run on your native system if you prefer. It supports both
> x86_64 and aarch64. And you can even run it in --dry-run mode to see the set of
> shell commands that would have been executed.
>
> It comes with two CCA configs out-of-the-box; cca-3world.yaml builds TF-A, RMM,
> Linux (for both host and guest), kvmtool and kvm-unit-tests. cca-4world.yaml
> adds Hafnium and some demo SPs for the secure world (although since Hafnium
> requires x86_64 to build, cca-4world.yaml doesn't currently work on an aarch64
> build host).
>
> See the documentation [1] and repository [2] for more info.
>
> Brief instructions to get you up and running:
>
>   # Install shrinkwrap. (I assume you have Docker installed):
>   sudo pip3 install pyyaml termcolor tuxmake
>   git clone https://git.gitlab.arm.com/tooling/shrinkwrap.git
>   export PATH=$PWD/shrinkwrap/shrinkwrap:$PATH
>
>   # If running Python < 3.9:
>   sudo pip3 install graphlib-backport
>
>   # Build all the CCA components:
>   shrinkwrap build cca-3world.yaml [--dry-run]

This has been working on my Multipass instance on M1, thanks for the tool.

Thanks,
Itaru.

>
>   # Run the stack in the FVP:
>   shrinkwrap run cca-3world.yaml -r ROOTFS=<my_rootfs.ext4> [--dry-run]
>
> By default, building is done at ~/.shrinkwrap/build/cca-3world and the package
> is created at ~/.shrinkwrap/package/cca-3world (this can be changed with
> envvars).
>
> The 'run' command will boot TF-A, RMM and host Linux kernel in the FVP, and
> mount the provided rootfs. You will likely want to have copied the userspace
> pieces into the rootfs before running, so you can create realms:
>
> - ~/.shrinkwrap/package/cca-3world/Image (kernel with RMI and RSI support)
> - ~/.shrinkwrap/package/cca-3world/lkvm (kvmtool able to launch realms)
> - ~/.shrinkwrap/package/cca-3world/kvm-unit-tests.tgz (built kvm-unit-tests)
>
> Once the FVP is booted to a shell, you can do something like this to launch a
> Linux guest in a realm:
>
>   lkvm run --realm --disable-sve -c 1 -m 256 -k Image
>
> [1] https://shrinkwrap.docs.arm.com
> [2] https://gitlab.arm.com/tooling/shrinkwrap
>
>
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