Re: [edk2-devel] [PATCH v2 0/6] ArmVirtPkg: Increase PlatformCI coverage

["Gerd Hoffmann" <kraxel@redhat.com>]

On Tue, Jan 24, 2023 at 05:34:11PM +0100, Ard Biesheuvel wrote:
> We recently experienced some build breakage in one of the ArmVirtPkg
> platforms that is not covered by PlatformCI, in the PrePi component
> which replaces the entire PEI stage. This component is now also being
> used in TDVF, and so any modifications to it may regress the existing
> users.
> 
> So add build and boot tests of ArmVirtQemuKernel (which is a version of
> ArmVirtQemu which can be loaded as a loadable image instead of executing
> from [emulated] NOR flash), and a build test of ArmVirtKvmTool, which is
> also based on PrePi and runs under the kvmtool VMM. To further increase
> coverage, enable secure boot, TPM support and HTTP(s) boot support when
> building ArmVirtQemu for AARCH64.

Acked-by: Gerd Hoffmann <kraxel@redhat.com>

As you mention secure boot:  As far I know current state of affairs is
that nothing protects efi variable flash on ArmVirt, so secure boot
isn't actually secure because the OS can easily manipulate 'db' etc.

State of affairs on physical hardware (at least on Qualcomm SoCs) seems
to be that there is some service running in the Trusted Zone secure
world which manages (and controls access to) EFI variables.  See
  https://lore.kernel.org/lkml/eaa455ed-2dd2-a33f-6420-a75484eccc35@gmail.com/t/

Do you happen to know whenever any of this is available as open source,
be it the secure world code or the EFI drivers talking to it?  Is there
some kind of standard for this or does every vendor brew its own?

thanks & take care,
  Gerd