[PATCH 05/15] KVM: Using gsi_msg mapping for MSI device assignment

[Sheng Yang <sheng@linux.intel.com>]

Convert MSI userspace interface to support gsi_msg mapping(and nobody should
be the user of the old interface...).

Signed-off-by: Sheng Yang <sheng@linux.intel.com>
---
 include/linux/kvm_host.h |    1 -
 virt/kvm/kvm_main.c      |   35 ++++++++++++++++++++++-------------
 2 files changed, 22 insertions(+), 14 deletions(-)

diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index 0e5741a..aa2606b 100644
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -313,7 +313,6 @@ struct kvm_assigned_dev_kernel {
 	int host_irq;
 	bool host_irq_disabled;
 	int guest_irq;
-	struct msi_msg guest_msi;
 #define KVM_ASSIGNED_DEV_GUEST_INTX	(1 << 0)
 #define KVM_ASSIGNED_DEV_GUEST_MSI	(1 << 1)
 #define KVM_ASSIGNED_DEV_HOST_INTX	(1 << 8)
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index 26bccf9..3494861 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -92,20 +92,30 @@ static void assigned_device_msi_dispatch(struct kvm_assigned_dev_kernel *dev)
 	int vcpu_id;
 	struct kvm_vcpu *vcpu;
 	struct kvm_ioapic *ioapic = ioapic_irqchip(dev->kvm);
-	int dest_id = (dev->guest_msi.address_lo & MSI_ADDR_DEST_ID_MASK)
-			>> MSI_ADDR_DEST_ID_SHIFT;
-	int vector = (dev->guest_msi.data & MSI_DATA_VECTOR_MASK)
-			>> MSI_DATA_VECTOR_SHIFT;
-	int dest_mode = test_bit(MSI_ADDR_DEST_MODE_SHIFT,
-				(unsigned long *)&dev->guest_msi.address_lo);
-	int trig_mode = test_bit(MSI_DATA_TRIGGER_SHIFT,
-				(unsigned long *)&dev->guest_msi.data);
-	int delivery_mode = test_bit(MSI_DATA_DELIVERY_MODE_SHIFT,
-				(unsigned long *)&dev->guest_msi.data);
+	struct kvm_gsi_msg *gsi_msg;
+	int dest_id, vector, dest_mode, trig_mode, delivery_mode;
 	u32 deliver_bitmask;
 
 	BUG_ON(!ioapic);
 
+	mutex_lock(&dev->kvm->gsi_msg_lock);
+	gsi_msg = kvm_find_gsi_msg(dev->kvm, dev->guest_irq);
+	if (!gsi_msg) {
+		printk(KERN_WARNING "kvm: fail to find correlated gsi_msg\n");
+		return;
+	}
+	mutex_unlock(&dev->kvm->gsi_msg_lock);
+
+	dest_id = (gsi_msg->msg.address_lo & MSI_ADDR_DEST_ID_MASK)
+			>> MSI_ADDR_DEST_ID_SHIFT;
+	vector = (gsi_msg->msg.data & MSI_DATA_VECTOR_MASK)
+			>> MSI_DATA_VECTOR_SHIFT;
+	dest_mode = test_bit(MSI_ADDR_DEST_MODE_SHIFT,
+				(unsigned long *)&gsi_msg->msg.address_lo);
+	trig_mode = test_bit(MSI_DATA_TRIGGER_SHIFT,
+				(unsigned long *)&gsi_msg->msg.data);
+	delivery_mode = test_bit(MSI_DATA_DELIVERY_MODE_SHIFT,
+				(unsigned long *)&gsi_msg->msg.data);
 	deliver_bitmask = kvm_ioapic_get_delivery_bitmask(ioapic,
 				dest_id, dest_mode);
 	/* IOAPIC delivery mode value is the same as MSI here */
@@ -316,17 +326,16 @@ static int assigned_device_update_msi(struct kvm *kvm,
 {
 	int r;
 
+	adev->guest_irq = airq->guest_irq;
+
 	if (airq->flags & KVM_DEV_IRQ_ASSIGN_ENABLE_MSI) {
 		/* x86 don't care upper address of guest msi message addr */
 		adev->irq_requested_type |= KVM_ASSIGNED_DEV_GUEST_MSI;
 		adev->irq_requested_type &= ~KVM_ASSIGNED_DEV_GUEST_INTX;
-		adev->guest_msi.address_lo = airq->guest_msi.addr_lo;
-		adev->guest_msi.data = airq->guest_msi.data;
 		adev->ack_notifier.gsi = -1;
 	} else if (msi2intx) {
 		adev->irq_requested_type |= KVM_ASSIGNED_DEV_GUEST_INTX;
 		adev->irq_requested_type &= ~KVM_ASSIGNED_DEV_GUEST_MSI;
-		adev->guest_irq = airq->guest_irq;
 		adev->ack_notifier.gsi = airq->guest_irq;
 	} else {
 		/*
-- 
1.5.4.5