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KVM: arm64: Allow userspace to request KVM_ARM_VCPU_EL2*

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Since we're (almost) feature complete, let's allow userspace to
request KVM_ARM_VCPU_EL2* by bumping KVM_VCPU_MAX_FEATURES up.

We also now advertise the features to userspace with new capabilities.

It's going to be great...

Reviewed-by: Oliver Upton <oliver.upton@linux.dev>
Reviewed-by: Joey Gouly <joey.gouly@arm.com>
Reviewed-by: Ganapatrao Kulkarni <gankulkarni@os.amperecomputing.com>
Link: https://lore.kernel.org/r/20250514103501.2225951-17-maz@kernel.org
Signed-off-by: Marc Zyngier <maz@kernel.org>
This commit is contained in:
Marc Zyngier 2025-05-14 11:34:59 +01:00
parent 6ec4c371d4
commit a7484c80e5
3 changed files with 9 additions and 1 deletions
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2
arch/arm64/include/asm/kvm_host.h
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@ -39,7 +39,7 @@
#define KVM_MAX_VCPUS VGIC_V3_MAX_CPUS
#define KVM_VCPU_MAX_FEATURES 7
#define KVM_VCPU_MAX_FEATURES 9
#define KVM_VCPU_VALID_FEATURES (BIT(KVM_VCPU_MAX_FEATURES) - 1)
#define KVM_REQ_SLEEP \

6
arch/arm64/kvm/arm.c
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@ -368,6 +368,12 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)
case KVM_CAP_ARM_EL1_32BIT:
r = cpus_have_final_cap(ARM64_HAS_32BIT_EL1);
break;
case KVM_CAP_ARM_EL2:
r = cpus_have_final_cap(ARM64_HAS_NESTED_VIRT);
break;
case KVM_CAP_ARM_EL2_E2H0:
r = cpus_have_final_cap(ARM64_HAS_HCR_NV1);
break;
case KVM_CAP_GUEST_DEBUG_HW_BPS:
r = get_num_brps();
break;

2
include/uapi/linux/kvm.h
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@ -930,6 +930,8 @@ struct kvm_enable_cap {
#define KVM_CAP_X86_APIC_BUS_CYCLES_NS 237
#define KVM_CAP_X86_GUEST_MODE 238
#define KVM_CAP_ARM_WRITABLE_IMP_ID_REGS 239
#define KVM_CAP_ARM_EL2 240
#define KVM_CAP_ARM_EL2_E2H0 241
struct kvm_irq_routing_irqchip {
__u32 irqchip;