[PATCH v2 05/20] pci-assign: Factor out kvm_device_intx_assign

[Jan Kiszka <jan.kiszka@xxxxxxxxxxx>]

Avoid passing kvm_assigned_irq on INTx assignment and separate this
function from (to-be-refactored) MSI/MSI-X assignment.

Signed-off-by: Jan Kiszka <jan.kiszka@xxxxxxxxxxx>
---
 hw/device-assignment.c |   16 ++++++----------
 target-i386/kvm.c      |   25 +++++++++++++++++++++++++
 target-i386/kvm_i386.h |    2 ++
 3 files changed, 33 insertions(+), 10 deletions(-)

diff --git a/hw/device-assignment.c b/hw/device-assignment.c
index 0b33c04..d448fdc 100644
--- a/hw/device-assignment.c
+++ b/hw/device-assignment.c
@@ -861,11 +861,10 @@ static int assign_device(AssignedDevice *dev)
 
 static int assign_intx(AssignedDevice *dev)
 {
-    struct kvm_assigned_irq assigned_irq_data;
     AssignedIRQType new_type;
     PCIINTxRoute intx_route;
     bool intx_host_msi;
-    int r = 0;
+    int r;
 
     /* Interrupt PIN 0 means don't use INTx */
     if (assigned_dev_pci_read_byte(&dev->dev, PCI_INTERRUPT_PIN) == 0) {
@@ -881,7 +880,7 @@ static int assign_intx(AssignedDevice *dev)
 
     if (dev->intx_route.mode == intx_route.mode &&
         dev->intx_route.irq == intx_route.irq) {
-        return r;
+        return 0;
     }
 
     switch (dev->assigned_irq_type) {
@@ -911,20 +910,17 @@ static int assign_intx(AssignedDevice *dev)
     }
 
 retry:
-    memset(&assigned_irq_data, 0, sizeof(assigned_irq_data));
-    assigned_irq_data.assigned_dev_id = dev->dev_id;
-    assigned_irq_data.guest_irq = intx_route.irq;
-    assigned_irq_data.flags = KVM_DEV_IRQ_GUEST_INTX;
     if (dev->features & ASSIGNED_DEVICE_PREFER_MSI_MASK &&
         dev->cap.available & ASSIGNED_DEVICE_CAP_MSI) {
-        assigned_irq_data.flags |= KVM_DEV_IRQ_HOST_MSI;
+        intx_host_msi = true;
         new_type = ASSIGNED_IRQ_INTX_HOST_MSI;
     } else {
-        assigned_irq_data.flags |= KVM_DEV_IRQ_HOST_INTX;
+        intx_host_msi = false;
         new_type = ASSIGNED_IRQ_INTX_HOST_INTX;
     }
 
-    r = kvm_assign_irq(kvm_state, &assigned_irq_data);
+    r = kvm_device_intx_assign(kvm_state, dev->dev_id, intx_host_msi,
+                               intx_route.irq);
     if (r < 0) {
         if (r == -EIO && !(dev->features & ASSIGNED_DEVICE_PREFER_MSI_MASK) &&
             dev->cap.available & ASSIGNED_DEVICE_CAP_MSI) {
diff --git a/target-i386/kvm.c b/target-i386/kvm.c
index 82448e3..fbdcee6 100644
--- a/target-i386/kvm.c
+++ b/target-i386/kvm.c
@@ -2091,6 +2091,31 @@ int kvm_device_pci_deassign(KVMState *s, uint32_t dev_id)
     return kvm_vm_ioctl(s, KVM_DEASSIGN_PCI_DEVICE, &dev_data);
 }
 
+static int kvm_assign_irq_internal(KVMState *s, uint32_t dev_id,
+                                   uint32_t irq_type, uint32_t guest_irq)
+{
+    struct kvm_assigned_irq assigned_irq = {
+        .assigned_dev_id = dev_id,
+        .guest_irq = guest_irq,
+        .flags = irq_type,
+    };
+
+    if (kvm_check_extension(s, KVM_CAP_ASSIGN_DEV_IRQ)) {
+        return kvm_vm_ioctl(s, KVM_ASSIGN_DEV_IRQ, &assigned_irq);
+    } else {
+        return kvm_vm_ioctl(s, KVM_ASSIGN_IRQ, &assigned_irq);
+    }
+}
+
+int kvm_device_intx_assign(KVMState *s, uint32_t dev_id, bool use_host_msi,
+                           uint32_t guest_irq)
+{
+    uint32_t irq_type = KVM_DEV_IRQ_GUEST_INTX |
+        (use_host_msi ? KVM_DEV_IRQ_HOST_MSI : KVM_DEV_IRQ_HOST_INTX);
+
+    return kvm_assign_irq_internal(s, dev_id, irq_type, guest_irq);
+}
+
 static int kvm_deassign_irq_internal(KVMState *s, uint32_t dev_id,
                                      uint32_t type)
 {
diff --git a/target-i386/kvm_i386.h b/target-i386/kvm_i386.h
index fdecdd5..5a24168 100644
--- a/target-i386/kvm_i386.h
+++ b/target-i386/kvm_i386.h
@@ -19,6 +19,8 @@ int kvm_device_pci_assign(KVMState *s, PCIHostDeviceAddress *dev_addr,
                           uint32_t flags, uint32_t *dev_id);
 int kvm_device_pci_deassign(KVMState *s, uint32_t dev_id);
 
+int kvm_device_intx_assign(KVMState *s, uint32_t dev_id,
+                           bool use_host_msi, uint32_t guest_irq);
 int kvm_device_intx_deassign(KVMState *s, uint32_t dev_id, bool use_host_msi);
 
 int kvm_device_msi_deassign(KVMState *s, uint32_t dev_id);
-- 
1.7.3.4

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