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[02/14] KVM: arm64: Hide ID_AA64MMFR2_EL1.NV from guest and userspace

Message ID 20250215173816.3767330-3-maz@kernel.org (mailing list archive)
State New
Headers show
Series KVM: arm64: NV userspace ABI | expand

Commit Message

Marc Zyngier Feb. 15, 2025, 5:38 p.m. UTC 
Since our take on FEAT_NV is to only support FEAT_NV2, we should
never expose ID_AA64MMFR2_EL1.NV to a guest nor userspace.

Make sure we mask this field for good.

Signed-off-by: Marc Zyngier <maz@kernel.org>
---
 arch/arm64/kvm/sys_regs.c | 1 +
 1 file changed, 1 insertion(+)
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Patch

diff --git a/arch/arm64/kvm/sys_regs.c b/arch/arm64/kvm/sys_regs.c
index 82430c1e1dd02..9f10dbd26e348 100644
--- a/arch/arm64/kvm/sys_regs.c
+++ b/arch/arm64/kvm/sys_regs.c
@@ -1627,6 +1627,7 @@  static u64 __kvm_read_sanitised_id_reg(const struct kvm_vcpu *vcpu,
 		break;
 	case SYS_ID_AA64MMFR2_EL1:
 		val &= ~ID_AA64MMFR2_EL1_CCIDX_MASK;
+		val &= ~ID_AA64MMFR2_EL1_NV;
 		break;
 	case SYS_ID_AA64MMFR3_EL1:
 		val &= ID_AA64MMFR3_EL1_TCRX | ID_AA64MMFR3_EL1_S1POE |