linux-kernel - [PATCH v4 11/13] KVM: arm/arm64: vgic: implement clear active for non shared mapped IRQ

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Date:	Thu, 19 Nov 2015 14:54:01 +0000
From:	Eric Auger <eric.auger@...aro.org>
To:	eric.auger@...com, eric.auger@...aro.org,
	alex.williamson@...hat.com, b.reynal@...tualopensystems.com,
	christoffer.dall@...aro.org, marc.zyngier@....com,
	linux-arm-kernel@...ts.infradead.org, kvmarm@...ts.cs.columbia.edu,
	kvm@...r.kernel.org
Cc:	andre.przywara@....com, linux-kernel@...r.kernel.org,
	patches@...aro.org
Subject: [PATCH v4 11/13] KVM: arm/arm64: vgic: implement clear active for non shared mapped IRQ

When disabling a non shared mapped IRQs, we must manually deactivate
the corresponding physical IRQ on top of removing the active state
from the distributor.

Signed-off-by: Eric Auger <eric.auger@...aro.org>
---
 virt/kvm/arm/vgic.c | 22 +++++++++++++++++++++-
 1 file changed, 21 insertions(+), 1 deletion(-)

diff --git a/virt/kvm/arm/vgic.c b/virt/kvm/arm/vgic.c
index bd500b4..98ae15f 100644
--- a/virt/kvm/arm/vgic.c
+++ b/virt/kvm/arm/vgic.c
@@ -604,14 +604,34 @@ bool vgic_handle_clear_active_reg(struct kvm *kvm,
 				  struct kvm_exit_mmio *mmio,
 				  phys_addr_t offset, int vcpu_id)
 {
-	u32 *reg;
+	u32 *reg, orig, cleared;
 	struct vgic_dist *dist = &kvm->arch.vgic;
+	struct kvm_vcpu *vcpu = kvm_get_vcpu(kvm, vcpu_id);
+	unsigned int i;
 
 	reg = vgic_bitmap_get_reg(&dist->irq_active, vcpu_id, offset);
+	orig = *reg;
 	vgic_reg_access(mmio, reg, offset,
 			ACCESS_READ_VALUE | ACCESS_WRITE_CLEARBIT);
 
 	if (mmio->is_write) {
+		cleared = orig ^ *reg;
+
+		for (i = 0; i < 32; i++) {
+			struct irq_phys_map *map;
+			unsigned int irq_num;
+
+			if (!(cleared && (1 << i)))
+				continue;
+			irq_num = (offset * 8) + i;
+			map = vgic_irq_map_search(vcpu, irq_num);
+			if (!map || (map && map->shared))
+				continue;
+			irq_set_irqchip_state(map->irq,
+					      IRQCHIP_STATE_ACTIVE,
+					      false);
+		}
+
 		vgic_update_state(kvm);
 		return true;
 	}
-- 
1.9.1

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