linux-kernel - [PATCH v2 04/16] arm/arm64: KVM: Add PSCI

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Date:   Mon, 29 Jan 2018 17:45:47 +0000
From:   Marc Zyngier <marc.zyngier@....com>
To:     linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        kvmarm@...ts.cs.columbia.edu
Cc:     Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>,
        Peter Maydell <peter.maydell@...aro.org>,
        Christoffer Dall <christoffer.dall@...aro.org>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Mark Rutland <mark.rutland@....com>,
        Robin Murphy <robin.murphy@....com>,
        Ard Biesheuvel <ard.biesheuvel@...aro.org>,
        Jon Masters <jcm@...hat.com>
Subject: [PATCH v2 04/16] arm/arm64: KVM: Add PSCI_VERSION helper

As we're about to trigger a PSCI version explosion, it doesn't
hurt to introduce a PSCI_VERSION helper that is going to be
used everywhere.

Signed-off-by: Marc Zyngier <marc.zyngier@....com>
---
 include/kvm/arm_psci.h | 5 +++--
 virt/kvm/arm/psci.c    | 2 +-
 2 files changed, 4 insertions(+), 3 deletions(-)

diff --git a/include/kvm/arm_psci.h b/include/kvm/arm_psci.h
index 2042bb909474..3a408c846c09 100644
--- a/include/kvm/arm_psci.h
+++ b/include/kvm/arm_psci.h
@@ -18,8 +18,9 @@
 #ifndef __KVM_ARM_PSCI_H__
 #define __KVM_ARM_PSCI_H__
 
-#define KVM_ARM_PSCI_0_1	1
-#define KVM_ARM_PSCI_0_2	2
+#define PSCI_VERSION(x,y)	((((x) & 0x7fff) << 16) | ((y) & 0xffff))
+#define KVM_ARM_PSCI_0_1	PSCI_VERSION(0, 1)
+#define KVM_ARM_PSCI_0_2	PSCI_VERSION(0, 2)
 
 int kvm_psci_version(struct kvm_vcpu *vcpu);
 int kvm_psci_call(struct kvm_vcpu *vcpu);
diff --git a/virt/kvm/arm/psci.c b/virt/kvm/arm/psci.c
index b322e46fd142..c00bb324e14e 100644
--- a/virt/kvm/arm/psci.c
+++ b/virt/kvm/arm/psci.c
@@ -222,7 +222,7 @@ static int kvm_psci_0_2_call(struct kvm_vcpu *vcpu)
 		 * Bits[31:16] = Major Version = 0
 		 * Bits[15:0] = Minor Version = 2
 		 */
-		val = 2;
+		val = KVM_ARM_PSCI_0_2;
 		break;
 	case PSCI_0_2_FN_CPU_SUSPEND:
 	case PSCI_0_2_FN64_CPU_SUSPEND:
-- 
2.14.2