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KVM: arm64: Allow userspace to limit NV support to nVHE

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NV is hard. No kidding.

In order to make things simpler, we have established that NV would
support two mutually exclusive configurations:

- VHE-only, and supporting recursive virtualisation

- nVHE-only, and not supporting recursive virtualisation

For that purpose, introduce a new vcpu feature flag that denotes
the second configuration. We use this flag to limit the idregs
further.

Signed-off-by: Marc Zyngier <maz@kernel.org>
Reviewed-by: Joey Gouly <joey.gouly@arm.com>
Link: https://lore.kernel.org/r/20250220134907.554085-11-maz@kernel.org
Signed-off-by: Oliver Upton <oliver.upton@linux.dev>
This commit is contained in:
Marc Zyngier
2025-02-20 13:49:03 +00:00
committed by Oliver Upton
parent 94f296dcd6
commit f83c41fb3d
2 changed files with 27 additions and 2 deletions
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1
arch/arm64/include/uapi/asm/kvm.h
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@@ -105,6 +105,7 @@ struct kvm_regs {
#define KVM_ARM_VCPU_PTRAUTH_ADDRESS 5 /* VCPU uses address authentication */
#define KVM_ARM_VCPU_PTRAUTH_GENERIC 6 /* VCPU uses generic authentication */
#define KVM_ARM_VCPU_HAS_EL2 7 /* Support nested virtualization */
#define KVM_ARM_VCPU_HAS_EL2_E2H0 8 /* Limit NV support to E2H RES0 */
struct kvm_vcpu_init {
__u32 target;