Subject: [PATCH 05/17] KVM: arm/arm64: vgic-its: Invalidate MSI-LPI translation cache on disabling LPIs

From: Marc Zyngier <[email-masked]>
Date: Mon, 9 Sep 2019 14:47:55 +0100

If a vcpu disables LPIs at its redistributor level, we need to make sure
we won't pend more interrupts. For this, we need to invalidate the LPI
translation cache.

Tested-by: Andre Przywara <[email-masked]>
Reviewed-by: Eric Auger <[email-masked]>
Signed-off-by: Marc Zyngier <[email-masked]>
---
 virt/kvm/arm/vgic/vgic-mmio-v3.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/virt/kvm/arm/vgic/vgic-mmio-v3.c b/virt/kvm/arm/vgic/vgic-mmio-v3.c
index c45e2d7e942f..fdcfb7ae4491 100644
--- a/virt/kvm/arm/vgic/vgic-mmio-v3.c
+++ b/virt/kvm/arm/vgic/vgic-mmio-v3.c
@@ -192,8 +192,10 @@ static void vgic_mmio_write_v3r_ctlr(struct kvm_vcpu *vcpu,
 
 	vgic_cpu->lpis_enabled = val & GICR_CTLR_ENABLE_LPIS;
 
-	if (was_enabled && !vgic_cpu->lpis_enabled)
+	if (was_enabled && !vgic_cpu->lpis_enabled) {
 		vgic_flush_pending_lpis(vcpu);
+		vgic_its_invalidate_cache(vcpu->kvm);
+	}
 
 	if (!was_enabled && vgic_cpu->lpis_enabled)
 		vgic_enable_lpis(vcpu);
-- 
2.20.1

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