[PATCH] KVM: PPC: Book3S HV: read ibm,secure-memory nodes

[Michael Ellerman]

Hi Laurent,

Laurent Dufour <ldufour at linux.ibm.com> writes:
> The newly introduced ibm,secure-memory nodes supersede the
> ibm,uv-firmware's property secure-memory-ranges.

Is either documented in a device tree binding document anywhere?

cheers

> Firmware will no more expose the secure-memory-ranges property so first
> read the new one and if not found rollback to the older one.
>
> Signed-off-by: Laurent Dufour <ldufour at linux.ibm.com>
> ---
>  arch/powerpc/kvm/book3s_hv_uvmem.c | 14 ++++++++++++++
>  1 file changed, 14 insertions(+)
>
> diff --git a/arch/powerpc/kvm/book3s_hv_uvmem.c b/arch/powerpc/kvm/book3s_hv_uvmem.c
> index 53b88cae3e73..ad950f8996e0 100644
> --- a/arch/powerpc/kvm/book3s_hv_uvmem.c
> +++ b/arch/powerpc/kvm/book3s_hv_uvmem.c
> @@ -735,6 +735,20 @@ static u64 kvmppc_get_secmem_size(void)
>  	const __be32 *prop;
>  	u64 size = 0;
>  
> +	/*
> +	 * First try the new ibm,secure-memory nodes which supersede the
> +	 * secure-memory-ranges property.
> +	 * If we found somes, no need to read the deprecated one.
> +	 */
> +	for_each_compatible_node(np, NULL, "ibm,secure-memory") {
> +		prop = of_get_property(np, "reg", &len);
> +		if (!prop)
> +			continue;
> +		size += of_read_number(prop + 2, 2);
> +	}
> +	if (size)
> +		return size;
> +
>  	np = of_find_compatible_node(NULL, NULL, "ibm,uv-firmware");
>  	if (!np)
>  		goto out;
> -- 
> 2.26.1