linux-kernel - [PATCH v3 43/59] KVM: arm/arm64: GICv4: Unmap VLPI when freeing an LPI

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Date:   Mon, 31 Jul 2017 18:26:21 +0100
From:   Marc Zyngier <marc.zyngier@....com>
To:     linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        kvmarm@...ts.cs.columbia.edu, kvm@...r.kernel.org
Cc:     Christoffer Dall <christoffer.dall@...aro.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Jason Cooper <jason@...edaemon.net>,
        Eric Auger <eric.auger@...hat.com>,
        Shanker Donthineni <shankerd@...eaurora.org>,
        Mark Rutland <mark.rutland@....com>,
        Shameerali Kolothum Thodi 
        <shameerali.kolothum.thodi@...wei.com>
Subject: [PATCH v3 43/59] KVM: arm/arm64: GICv4: Unmap VLPI when freeing an LPI

When freeing an LPI (on a DISCARD command, for example), we need
to unmap the VLPI down to the physical ITS level.

Signed-off-by: Marc Zyngier <marc.zyngier@....com>
---
 virt/kvm/arm/vgic/vgic-its.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/virt/kvm/arm/vgic/vgic-its.c b/virt/kvm/arm/vgic/vgic-its.c
index 40aeadef33fe..79bac93d3e7d 100644
--- a/virt/kvm/arm/vgic/vgic-its.c
+++ b/virt/kvm/arm/vgic/vgic-its.c
@@ -623,8 +623,12 @@ static void its_free_ite(struct kvm *kvm, struct its_ite *ite)
 	list_del(&ite->ite_list);
 
 	/* This put matches the get in vgic_add_lpi. */
-	if (ite->irq)
+	if (ite->irq) {
+		if (ite->irq->hw)
+			its_unmap_vlpi(ite->irq->host_irq);
+
 		vgic_put_irq(kvm, ite->irq);
+	}
 
 	kfree(ite);
 }
-- 
2.11.0