Re: [PATCH v7 7/7] hw/arm/virt: Add properties to disable high memory regions

[Cornelia Huck]

On Sun, Oct 30 2022, Gavin Shan <gshan@redhat.com> wrote:

> The 3 high memory regions are usually enabled by default, but they may
> be not used. For example, VIRT_HIGH_GIC_REDIST2 isn't needed by GICv2.
> This leads to waste in the PA space.
>
> Add properties ("highmem-redists", "highmem-ecam", "highmem-mmio") to
> allow users selectively disable them if needed. After that, the high
> memory region for GICv3 or GICv4 redistributor can be disabled by user,
> the number of maximal supported CPUs needs to be calculated based on
> 'vms->highmem_redists'. The follow-up error message is also improved
> to indicate if the high memory region for GICv3 and GICv4 has been
> enabled or not.
>
> Suggested-by: Marc Zyngier <maz@kernel.org>
> Signed-off-by: Gavin Shan <gshan@redhat.com>
> Reviewed-by: Marc Zyngier <maz@kernel.org>
> ---
>  docs/system/arm/virt.rst | 13 +++++++
>  hw/arm/virt.c            | 75 ++++++++++++++++++++++++++++++++++++++--
>  2 files changed, 86 insertions(+), 2 deletions(-)

Reviewed-by: Cornelia Huck <cohuck@redhat.com>