[PATCH v2 27/28] KVM: arm64: Expose FEAT_NV3 to guests
From: Marc Zyngier <maz@kernel.org>
Date: 2026-07-14 09:16:54
Also in:
kvm, kvmarm
Subsystem:
arm64 port (aarch64 architecture), kernel virtual machine for arm64 (kvm/arm64), the rest · Maintainers:
Catalin Marinas, Will Deacon, Marc Zyngier, Oliver Upton, Linus Torvalds
Further enable FEAT_NV3 by making it visible to NV guests. Signed-off-by: Marc Zyngier <maz@kernel.org> --- arch/arm64/kvm/nested.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/arch/arm64/kvm/nested.c b/arch/arm64/kvm/nested.c
index f646894fec9a9..70d605e60cfb3 100644
--- a/arch/arm64/kvm/nested.c
+++ b/arch/arm64/kvm/nested.c@@ -1728,7 +1728,7 @@ u64 limit_nv_id_reg(struct kvm *kvm, u32 reg, u64 val) * You get EITHER * * - FEAT_VHE without FEAT_E2H0 - * - FEAT_NV limited to FEAT_NV2(p1) + * - FEAT_NV limited to FEAT_NV2(p1)/NV3 * - HCR_EL2.NV1 being RES0 * * OR
@@ -1741,7 +1741,9 @@ u64 limit_nv_id_reg(struct kvm *kvm, u32 reg, u64 val) val = 0; } else { val &= ID_AA64MMFR4_EL1_NV_frac; - if (cpus_have_final_cap(ARM64_HAS_NV2P1)) + if (cpus_have_final_cap(ARM64_HAS_NV3)) + val = ID_REG_LIMIT_FIELD_ENUM(val, ID_AA64MMFR4_EL1, NV_frac, NV3); + else if (cpus_have_final_cap(ARM64_HAS_NV2P1)) val = ID_REG_LIMIT_FIELD_ENUM(val, ID_AA64MMFR4_EL1, NV_frac, NV2P1); else val = SYS_FIELD_PREP_ENUM(ID_AA64MMFR4_EL1, NV_frac, NV2_ONLY);
--
2.47.3