linux-kernel - [RFC kvmtool 23/31] arm64: Specify SMC as the PSCI conduits for realms

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Message-Id: <20230127113932.166089-24-suzuki.poulose@arm.com>
Date:   Fri, 27 Jan 2023 11:39:24 +0000
From:   Suzuki K Poulose <suzuki.poulose@....com>
To:     kvm@...r.kernel.org, kvmarm@...ts.linux.dev
Cc:     suzuki.poulose@....com,
        Alexandru Elisei <alexandru.elisei@....com>,
        Andrew Jones <andrew.jones@...ux.dev>,
        Christoffer Dall <christoffer.dall@....com>,
        Fuad Tabba <tabba@...gle.com>,
        Jean-Philippe Brucker <jean-philippe@...aro.org>,
        Joey Gouly <Joey.Gouly@....com>, Marc Zyngier <maz@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Oliver Upton <oliver.upton@...ux.dev>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Quentin Perret <qperret@...gle.com>,
        Steven Price <steven.price@....com>,
        Thomas Huth <thuth@...hat.com>, Will Deacon <will@...nel.org>,
        Zenghui Yu <yuzenghui@...wei.com>, linux-coco@...ts.linux.dev,
        kvmarm@...ts.cs.columbia.edu, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: [RFC kvmtool 23/31] arm64: Specify SMC as the PSCI conduits for realms

From: Christoffer Dall <christoffer.dall@....com>

This lets the VM use the RMM implementation for PSCI.

Signed-off-by: Christoffer Dall <christoffer.dall@....com>
Signed-off-by: Alexandru Elisei <alexandru.elisei@....com>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@....com>
---
 arm/fdt.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/arm/fdt.c b/arm/fdt.c
index 762a604d..c46ff410 100644
--- a/arm/fdt.c
+++ b/arm/fdt.c
@@ -208,7 +208,14 @@ static int setup_fdt(struct kvm *kvm)
 		_FDT(fdt_property_string(fdt, "compatible", "arm,psci"));
 		fns = &psci_0_1_fns;
 	}
-	_FDT(fdt_property_string(fdt, "method", "hvc"));
+
+
+	if (kvm->cfg.arch.is_realm) {
+		_FDT(fdt_property_string(fdt, "method", "smc"));
+	} else {
+		_FDT(fdt_property_string(fdt, "method", "hvc"));
+	}
+
 	_FDT(fdt_property_cell(fdt, "cpu_suspend", fns->cpu_suspend));
 	_FDT(fdt_property_cell(fdt, "cpu_off", fns->cpu_off));
 	_FDT(fdt_property_cell(fdt, "cpu_on", fns->cpu_on));
-- 
2.34.1