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

[Mathieu Poirier <mathieu.poirier@linaro.org>]

On Tue, Sep 01, 2026 at 03:20:13PM +0200, Markus Armbruster wrote:
> 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.

This was clearly explained above.  The goal was to provide a patchset that can
be used for testing. I can attempt a rebase but can't guarantee a timeline or
success.

> 
> >           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
> 
>