Re: [PATCH v2] hw/arm: add versioning to sbsa-ref machine DT

[Peter Maydell]

On Thu, 5 May 2022 at 12:39, Leif Lindholm <quic_llindhol@quicinc.com> wrote:
>
> The sbsa-ref machine is continuously evolving. Some of the changes we
> want to make in the near future, to align with real components (e.g.
> the GIC-700), will break compatibility for existing firmware.
>
> Introduce two new properties to the DT generated on machine generation:
> - machine-version-major
>   To be incremented when a platform change makes the machine
>   incompatible with existing firmware.
> - machine-version-minor
>   To be incremented when functionality is added to the machine
>   without causing incompatibility with existing firmware.
>   to be reset to 0 when machine-version-major is incremented.
>
> This versioning scheme is *neither*:
> - A QEMU versioned machine type; a given version of QEMU will emulate
>   a given version of the platform.
> - A reflection of level of SBSA (now SystemReady SR) support provided.
>
> The version will increment on guest-visible functional changes only,
> akin to a revision ID register found on a physical platform.
>
> These properties are both introduced with the value 0.
> (Hence, a machine where the DT is lacking these nodes is equivalent
> to version 0.0.)
>



Applied to target-arm.next, thanks.

-- PMM