diff mbox series

[v7,47/68] KVM: arm64: nv: Don't load the GICv4 context on entering a nested guest

Message ID 20230112191927.1814989-48-maz@kernel.org (mailing list archive)
State New, archived
Headers show
Series KVM: arm64: ARMv8.3/8.4 Nested Virtualization support | expand

Commit Message

Marc Zyngier Jan. 12, 2023, 7:19 p.m. UTC 
When entering a nested guest (vgic_state_is_nested() == true),
special care must be taken *not* to make the vPE resident, as
these are interrupts targetting the L1 guest, and not any
nested guest.

By not making the vPE resident, we guarantee that the delivery
of an vLPI will result in a doorbell, forcing an exit from the
nested guest and a switch to the L1 guest to handle the interrupt.

Signed-off-by: Marc Zyngier <maz@kernel.org>
---
 arch/arm64/kvm/vgic/vgic-v3.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)
diff mbox series

Patch

diff --git a/arch/arm64/kvm/vgic/vgic-v3.c b/arch/arm64/kvm/vgic/vgic-v3.c
index 57cfa7255f37..33de8a4644a0 100644
--- a/arch/arm64/kvm/vgic/vgic-v3.c
+++ b/arch/arm64/kvm/vgic/vgic-v3.c
@@ -755,8 +755,8 @@  void vgic_v3_load(struct kvm_vcpu *vcpu)
 
 	if (vgic_state_is_nested(vcpu))
 		vgic_v3_load_nested(vcpu);
-
-	WARN_ON(vgic_v4_load(vcpu));
+	else
+		WARN_ON(vgic_v4_load(vcpu));
 }
 
 void vgic_v3_vmcr_sync(struct kvm_vcpu *vcpu)
@@ -774,6 +774,12 @@  void vgic_v3_put(struct kvm_vcpu *vcpu)
 {
 	struct vgic_v3_cpu_if *cpu_if = &vcpu->arch.vgic_cpu.vgic_v3;
 
+	/*
+	 * vgic_v4_put will do nothing if we were not resident. This
+	 * covers both the cases where we've blocked (we already have
+	 * done a vgic_v4_put) and when running a nested guest (the
+	 * vPE was never resident in order to generate a doorbell).
+	 */
 	WARN_ON(vgic_v4_put(vcpu, false));
 
 	vgic_v3_vmcr_sync(vcpu);