Re: [RFC v3 00/24] Add Realm support to QEMU-VMM

[Markus Armbruster <armbru@redhat.com>]

Mathieu Poirier <mathieu.poirier@linaro.org> writes:

> This patchset provides minimal functionality to start a Realm VM
> from an Arm RME capable host using the following command line:
>
> qemu-system-aarch64 \
>  -M confidential-guest-support=rme0,memory-backend=ram0 \
>  -object rme-guest,id=rme0,convert-in-place=on \
>  -object memory-backend-guest-memfd,id=ram0,size=1G,share=on \
>  -cpu host -M virt -enable-kvm -M gic-version=3,its=on -nodefaults ..
>
> It is a refactoring of Jean-Philippe Brucker's initial work dating from a while
> back.  It is compatible with Steven Price's v16 revision [1] of his work adding
> CCA support to KVM.
>
> This revision is based on Michael Roth's work on guest memfd in-place memory
> conversion [2] and as such, the QEMU baseline is different from 'master'.  Other

Use

    Based-on: <20260528000416.8161-1-michael.roth@amd.com>

to document your base.  This stands out to humans, and is readable by
machines.  Next time :)

> than modifications to use in-place memory conversion from Lorenzo Pieralisi that
> were integrated to patches 04, 08-11, it is identical to V2.   
>
> It was tested on the QEMU SBSA machine.  For convenience, a repository is hosted
> here [3],

Michael's series doesn't apply on master anymore, so I fetched this
branch.  It's based on master as of *May*.  This won't do.  Please rebase.

>           along with the TF-A [4] and RMM [5] for the SBSA machine (compatible
> with Steven's v16 patchset).  The Repository for the kernel [6] is available
> from Arm.
>
> Instructions to compile and run the entire stack can be found here [7].
>
> Device Assignment is not included.
>
> Thanks,
> Mathieu
>
> [1]. https://lore.kernel.org/kvm/20260803134403.80630-1-steven.price@arm.com/
> [2]. https://lore.kernel.org/kvm/20260528000416.8161-1-michael.roth@amd.com/
> [3]. https://gitlab.com/Linaro/cca-public/qemu/-/tree/upstream-v3?ref_type=heads
> [4]. https://gitlab.com/Linaro/cca-public/tf-a/trusted-firmware-a/-/tree/cca/v13?ref_type=heads
> [5]. https://gitlab.com/Linaro/cca-public/rmm/-/tree/cca/v16?ref_type=heads
> [6]. https://gitlab.arm.com/linux-arm/linux-cca/-/tree/cca-host/v16?ref_type=heads
> [7]. https://gitlab.com/Linaro/cca-public/build-instructions
>
> RFC v2: https://lore.kernel.org/kvm/20260728192630.240375-1-mathieu.poirier@linaro.org/
> RFC v1: https://lists.gnu.org/archive/html/qemu-devel/2026-07/msg02307.html