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[v3,16/16] KVM: arm64: nv: Fail KVM init if asking for NV without GICv3

Message ID 20250206154925.1109065-17-maz@kernel.org (mailing list archive)
State New
Headers show
Series KVM: arm64: Add NV GICv3 support | expand

Commit Message

Marc Zyngier Feb. 6, 2025, 3:49 p.m. UTC 
Although there is nothing in NV that is fundamentally incompatible
with the lack of GICv3, there is no HW implementation without one,
at least on the virtual side (yes, even fruits have some form of
vGICv3).

We therefore make the decision to require GICv3, which will only
affect models such as QEMU. Booting with a GICv2 or something
even more exotic while asking for NV will result in KVM being
disabled.

Signed-off-by: Marc Zyngier <maz@kernel.org>
---
 arch/arm64/kvm/arm.c | 7 +++++++
 1 file changed, 7 insertions(+)
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Patch

diff --git a/arch/arm64/kvm/arm.c b/arch/arm64/kvm/arm.c
index 6063131f84426..fa429b3fd4ac2 100644
--- a/arch/arm64/kvm/arm.c
+++ b/arch/arm64/kvm/arm.c
@@ -2308,6 +2308,13 @@  static int __init init_subsystems(void)
 		goto out;
 	}
 
+	if (kvm_mode == KVM_MODE_NV &&
+	   !(vgic_present && kvm_vgic_global_state.type == VGIC_V3)) {
+		kvm_err("NV support requires GICv3, giving up\n");
+		err = -EINVAL;
+		goto out;
+	}
+
 	/*
 	 * Init HYP architected timer support
 	 */