linux-kernel - [PATCH] KVM: arm64: Bump KVM_VCPU_MAX

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Message-ID: <20241127145644.421352-1-steven.price@arm.com>
Date: Wed, 27 Nov 2024 14:56:31 +0000
From: Steven Price <steven.price@....com>
To: Catalin Marinas <catalin.marinas@....com>,
	Marc Zyngier <maz@...nel.org>,
	Oliver Upton <oliver.upton@...ux.dev>,
	Will Deacon <will@...nel.org>
Cc: Steven Price <steven.price@....com>,
	Joey Gouly <joey.gouly@....com>,
	Suzuki K Poulose <suzuki.poulose@....com>,
	Zenghui Yu <yuzenghui@...wei.com>,
	kvmarm@...ts.linux.dev,
	linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] KVM: arm64: Bump KVM_VCPU_MAX_FEATURES

When the KVM_ARM_VCPU_HAS_EL2 define was added, the value of
KVM_VCPU_MAX_FEATURES wasn't incremented, so that feature has never been
in the KVM_VCPU_VALID_FEATURES bit mask. This means the HAS_EL2 feature
will never be exposed to user space even if the system supports it.

Fixes: 89b0e7de3451 ("KVM: arm64: nv: Introduce nested virtualization VCPU feature")
Signed-off-by: Steven Price <steven.price@....com>
---
I might be missing something, and it's possible that
KVM_ARM_VCPU_HAS_EL2 is deliberately not exposed yet. However I'm
working on v6 of the host CCA series and as part of that want to add a
new feature but and bump KVM_VCPU_MAX_FEATURES up to 9.

 arch/arm64/include/asm/kvm_host.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm64/include/asm/kvm_host.h b/arch/arm64/include/asm/kvm_host.h
index e18e9244d17a..af7c827b216e 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_VCPU_VALID_FEATURES	(BIT(KVM_VCPU_MAX_FEATURES) - 1)
 
 #define KVM_REQ_SLEEP \
-- 
2.43.0