From: Oliver Upton <oliver.upton@linux.dev>
To: kvmarm@lists.linux.dev
Cc: kvm@vger.kernel.org, Marc Zyngier <maz@kernel.org>,
James Morse <james.morse@arm.com>,
Suzuki K Poulose <suzuki.poulose@arm.com>,
Zenghui Yu <yuzenghui@huawei.com>,
Oliver Upton <oliver.upton@linux.dev>
Subject: [PATCH 3/8] KVM: arm64: Hoist SVE check into KVM_ARM_VCPU_INIT ioctl handler
Date: Wed, 20 Sep 2023 19:50:31 +0000 [thread overview]
Message-ID: <20230920195036.1169791-4-oliver.upton@linux.dev> (raw)
In-Reply-To: <20230920195036.1169791-1-oliver.upton@linux.dev>
Test that the system supports SVE before ever getting to
kvm_reset_vcpu().
Signed-off-by: Oliver Upton <oliver.upton@linux.dev>
---
arch/arm64/kvm/arm.c | 3 +++
arch/arm64/kvm/reset.c | 14 +++-----------
2 files changed, 6 insertions(+), 11 deletions(-)
diff --git a/arch/arm64/kvm/arm.c b/arch/arm64/kvm/arm.c
index c6cb7e40315f..9415a760fcda 100644
--- a/arch/arm64/kvm/arm.c
+++ b/arch/arm64/kvm/arm.c
@@ -1200,6 +1200,9 @@ static unsigned long system_supported_vcpu_features(void)
if (!kvm_arm_support_pmu_v3())
clear_bit(KVM_ARM_VCPU_PMU_V3, &features);
+ if (!system_supports_sve())
+ clear_bit(KVM_ARM_VCPU_SVE, &features);
+
return features;
}
diff --git a/arch/arm64/kvm/reset.c b/arch/arm64/kvm/reset.c
index 5b5c74cb901d..3cb08d35b8e0 100644
--- a/arch/arm64/kvm/reset.c
+++ b/arch/arm64/kvm/reset.c
@@ -73,11 +73,8 @@ int __init kvm_arm_init_sve(void)
return 0;
}
-static int kvm_vcpu_enable_sve(struct kvm_vcpu *vcpu)
+static void kvm_vcpu_enable_sve(struct kvm_vcpu *vcpu)
{
- if (!system_supports_sve())
- return -EINVAL;
-
vcpu->arch.sve_max_vl = kvm_sve_max_vl;
/*
@@ -86,8 +83,6 @@ static int kvm_vcpu_enable_sve(struct kvm_vcpu *vcpu)
* kvm_arm_vcpu_finalize(), which freezes the configuration.
*/
vcpu_set_flag(vcpu, GUEST_HAS_SVE);
-
- return 0;
}
/*
@@ -231,11 +226,8 @@ int kvm_reset_vcpu(struct kvm_vcpu *vcpu)
}
if (!kvm_arm_vcpu_sve_finalized(vcpu)) {
- if (test_bit(KVM_ARM_VCPU_SVE, vcpu->arch.features)) {
- ret = kvm_vcpu_enable_sve(vcpu);
- if (ret)
- goto out;
- }
+ if (test_bit(KVM_ARM_VCPU_SVE, vcpu->arch.features))
+ kvm_vcpu_enable_sve(vcpu);
} else {
kvm_vcpu_reset_sve(vcpu);
}
--
2.42.0.515.g380fc7ccd1-goog
next prev parent reply other threads:[~2023-09-20 19:50 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-09-20 19:50 [PATCH 0/8] KVM: arm64: Cleanup + fix to vCPU reset, feature flags Oliver Upton
2023-09-20 19:50 ` [PATCH 1/8] KVM: arm64: Add generic check for system-supported vCPU features Oliver Upton
2023-09-21 8:30 ` Marc Zyngier
2023-09-21 12:47 ` Philippe Mathieu-Daudé
2023-09-20 19:50 ` [PATCH 2/8] KVM: arm64: Hoist PMUv3 check into KVM_ARM_VCPU_INIT ioctl handler Oliver Upton
2023-09-21 12:48 ` Philippe Mathieu-Daudé
2023-09-20 19:50 ` Oliver Upton [this message]
2023-09-20 19:50 ` [PATCH 4/8] KVM: arm64: Hoist PAuth checks into KVM_ARM_VCPU_INIT ioctl Oliver Upton
2023-09-20 19:50 ` [PATCH 5/8] KVM: arm64: Prevent NV feature flag on systems w/o nested virt Oliver Upton
2023-09-21 8:25 ` Marc Zyngier
2023-09-20 19:50 ` [PATCH 6/8] KVM: arm64: Hoist NV+SVE check into KVM_ARM_VCPU_INIT ioctl handler Oliver Upton
2023-09-20 19:50 ` [PATCH 7/8] KVM: arm64: Remove unused return value from kvm_reset_vcpu() Oliver Upton
2023-09-20 19:50 ` [PATCH 8/8] KVM: arm64: Get rid of vCPU-scoped feature bitmap Oliver Upton
2023-09-21 8:49 ` [PATCH 0/8] KVM: arm64: Cleanup + fix to vCPU reset, feature flags Marc Zyngier
2023-09-21 18:18 ` Oliver Upton
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