Re: [RFC] Support for Arm CCA VMs on Linux

Itaru Kitayama
2023-02-17T08:03:08Z

On Sat, Feb 11, 2023 at 7:53 AM Itaru Kitayama <itaru.kitayama@gmail.com> wrote:
>
> On Sat, Feb 11, 2023 at 1:56 AM Ryan Roberts <ryan.roberts@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.

It took a while though I've just booted an Ubuntu 22.10 disk image
with the cca-3world.yaml config on M1.

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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