Re: [PATCH v22 17/23] KVM: arm64: CCA: Add bare minimal S2 operations for Realm

[Gavin Shan]

On 10/5/26 7:07 PM, Suzuki K Poulose wrote:
> Add bare minimal MMU operation hooks for Realms. The mem_abort handling
> is chosen as the default KVM variant. However this cannot be reached for
> Realms yet and we would need real RMI command support to make it fully
> functional. Similarly, unmapping stage2 requires RMI command support.
> Until then reuse follow protected pKVM hook and ignore unmapping.
> This will be addressed in the later series.
>
> RMM takes care of the TLB flushing as required, when the Stage2 is
> modified. So host doesn't need to do anything explicitly. RMM doesn't
> support access flags for the stage2, even for the shared IPA.
>
> Signed-off-by: Suzuki K Poulose <suzuki.poulose@xxxxxxx>
> ---
> Changes since v21:
>   - Reuse no_age_gfn for Realms. Also use no_stage2_unmap_range for
>     now, until we get proper RMI backed driver.
> ---
>   arch/arm64/kvm/mmu.c | 23 +++++++++++++++++++++++
>   1 file changed, 23 insertions(+)

Reviewed-by: Gavin Shan <gshan@xxxxxxxxxx>