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

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Date:   Tue, 26 May 2020 19:51:15 +0200
From:   Laurent Dufour <ldufour@...ux.ibm.com>
To:     kvm-ppc@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        paulus@...ba.org
Cc:     Alexey Kardashevskiy <aik@...abs.ru>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] KVM: PPC: Book3S HV: read ibm,secure-memory nodes

Paul, could you please take that patch?

Le 16/04/2020 à 18:27, Laurent Dufour a écrit :
> The newly introduced ibm,secure-memory nodes supersede the
> ibm,uv-firmware's property secure-memory-ranges.
> 
> 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@...ux.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;
>