linux-kernel - [RFC PATCH v4 39/39] KVM: arm64: Allow userspace to enable SPE for guests

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Message-Id: <20210825161815.266051-40-alexandru.elisei@arm.com>
Date:   Wed, 25 Aug 2021 17:18:15 +0100
From:   Alexandru Elisei <alexandru.elisei@....com>
To:     maz@...nel.org, james.morse@....com, suzuki.poulose@....com,
        linux-arm-kernel@...ts.infradead.org, kvmarm@...ts.cs.columbia.edu,
        will@...nel.org, linux-kernel@...r.kernel.org
Subject: [RFC PATCH v4 39/39] KVM: arm64: Allow userspace to enable SPE for guests

Everything is in place to emulate SPE for a guest, allow userspace to set
the VCPU feature.

Signed-off-by: Alexandru Elisei <alexandru.elisei@....com>
---
 arch/arm64/include/asm/kvm_host.h | 2 +-
 arch/arm64/kvm/arm.c              | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/arm64/include/asm/kvm_host.h b/arch/arm64/include/asm/kvm_host.h
index f866c4556ff9..040da3b0cf2b 100644
--- a/arch/arm64/include/asm/kvm_host.h
+++ b/arch/arm64/include/asm/kvm_host.h
@@ -39,7 +39,7 @@
 
 #define KVM_MAX_VCPUS VGIC_V3_MAX_CPUS
 
-#define KVM_VCPU_MAX_FEATURES 7
+#define KVM_VCPU_MAX_FEATURES 8
 
 #define KVM_REQ_SLEEP \
 	KVM_ARCH_REQ_FLAGS(0, KVM_REQUEST_WAIT | KVM_REQUEST_NO_WAKEUP)
diff --git a/arch/arm64/kvm/arm.c b/arch/arm64/kvm/arm.c
index b7aae25bb9da..8016b98a8ac3 100644
--- a/arch/arm64/kvm/arm.c
+++ b/arch/arm64/kvm/arm.c
@@ -309,7 +309,7 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)
 		break;
 	case KVM_CAP_ARM_SPE:
 		kvm_spe_init_supported_cpus();
-		r = 0;
+		r = kvm_supports_spe();
 		break;
 	default:
 		r = 0;
-- 
2.33.0