[PATCH v5 57/69] KVM: arm64: nv: Allow userspace to request KVM_ARM_VCPU_NESTED_VIRT
Marc Zyngier
maz at kernel.org
Mon Nov 29 12:01:38 PST 2021
Since we're (almost) feature complete, let's allow userspace to
request KVM_ARM_VCPU_NESTED_VIRT by bumping the KVM_VCPU_MAX_FEATURES
up. We also now advertise the feature to userspace with a new capability.
It's going to be great...
Signed-off-by: Marc Zyngier <maz at kernel.org>
---
arch/arm64/include/asm/kvm_host.h | 2 +-
arch/arm64/kvm/arm.c | 3 +++
include/uapi/linux/kvm.h | 1 +
3 files changed, 5 insertions(+), 1 deletion(-)
diff --git a/arch/arm64/include/asm/kvm_host.h b/arch/arm64/include/asm/kvm_host.h
index 323215873388..911dd25dba8e 100644
--- a/arch/arm64/include/asm/kvm_host.h
+++ b/arch/arm64/include/asm/kvm_host.h
@@ -38,7 +38,7 @@
#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 0bb46bce5ffb..dc1fda709cf5 100644
--- a/arch/arm64/kvm/arm.c
+++ b/arch/arm64/kvm/arm.c
@@ -257,6 +257,9 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)
case KVM_CAP_ARM_EL1_32BIT:
r = cpus_have_const_cap(ARM64_HAS_32BIT_EL1);
break;
+ case KVM_CAP_ARM_EL2:
+ r = cpus_have_const_cap(ARM64_HAS_NESTED_VIRT);
+ break;
case KVM_CAP_GUEST_DEBUG_HW_BPS:
r = get_num_brps();
break;
diff --git a/include/uapi/linux/kvm.h b/include/uapi/linux/kvm.h
index 1daa45268de2..65d1862ab093 100644
--- a/include/uapi/linux/kvm.h
+++ b/include/uapi/linux/kvm.h
@@ -1131,6 +1131,7 @@ struct kvm_ppc_resize_hpt {
#define KVM_CAP_EXIT_ON_EMULATION_FAILURE 204
#define KVM_CAP_ARM_MTE 205
#define KVM_CAP_VM_MOVE_ENC_CONTEXT_FROM 206
+#define KVM_CAP_ARM_EL2 207
#ifdef KVM_CAP_IRQ_ROUTING
--
2.30.2
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