[PATCH 2/5] KVM: arm64: Enable nested for GICv5 host with FEAT_GCIE_LEGACY
From: Sascha Bischoff <hidden>
Date: 2025-08-28 11:00:25
Also in:
kvm, kvmarm, lkml
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
Extend the NV check to pass for a GICv5 host that has FEAT_GCIE_LEGACY. The has_gcie_v3_compat flag is only set on GICv5 hosts (that explicitly support FEAT_GCIE_LEGACY), and hence the explicit check for a VGIC_V5 is omitted. As of this change, vGICv3-based VMs can run with nested on a compatible GICv5 host. Signed-off-by: Sascha Bischoff <redacted> --- arch/arm64/kvm/arm.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/arch/arm64/kvm/arm.c b/arch/arm64/kvm/arm.c
index 888f7c7abf54..73ac33425927 100644
--- a/arch/arm64/kvm/arm.c
+++ b/arch/arm64/kvm/arm.c@@ -2315,8 +2315,9 @@ static int __init init_subsystems(void) } if (kvm_mode == KVM_MODE_NV && - !(vgic_present && kvm_vgic_global_state.type == VGIC_V3)) { - kvm_err("NV support requires GICv3, giving up\n"); + !(vgic_present && (kvm_vgic_global_state.type == VGIC_V3 || + kvm_vgic_global_state.has_gcie_v3_compat))) { + kvm_err("NV support requires GICv3 or GICv5 with legacy support, giving up\n"); err = -EINVAL; goto out; }
--
2.34.1