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

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Date:   Thu, 16 Apr 2020 18:27:15 +0200
From:   Laurent Dufour <ldufour@...ux.ibm.com>
To:     kvm-ppc@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org
Cc:     paulus@...ba.org, mpe@...erman.id.au, linux-kernel@...r.kernel.org,
        Alexey Kardashevskiy <aik@...abs.ru>, benh@...nel.crashing.org
Subject: [PATCH] KVM: PPC: Book3S HV: read ibm,secure-memory nodes

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;
-- 
2.26.1