xen: Introduce Xen Interrupt Controller

Every set_irq call makes a Xen hypercall.

Signed-off-by: Anthony PERARD <anthony.perard@citrix.com>
Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Signed-off-by: Alexander Graf <agraf@suse.de>

2 files changed, 8 insertions, 2 deletions

diff --git a/hw/pc_piix.c b/hw/pc_piix.c
index 9353b91..62cdf71 100644
--- a/hw/pc_piix.c
+++ b/hw/pc_piix.c
@@ -110,8 +110,12 @@ static void pc_init1(ram_addr_t ram_size,
                        below_4g_mem_size, above_4g_mem_size);
     }
 
-    cpu_irq = pc_allocate_cpu_irq();
-    i8259 = i8259_init(cpu_irq[0]);
+    if (!xen_enabled()) {
+        cpu_irq = pc_allocate_cpu_irq();
+        i8259 = i8259_init(cpu_irq[0]);
+    } else {
+        i8259 = xen_interrupt_controller_init();
+    }
     isa_irq_state = qemu_mallocz(sizeof(*isa_irq_state));
     isa_irq_state->i8259 = i8259;
     if (pci_enabled) {
diff --git a/hw/xen.h b/hw/xen.h
index a4096ca..9f00c0b 100644
--- a/hw/xen.h
+++ b/hw/xen.h
@@ -35,6 +35,8 @@ int xen_pci_slot_get_pirq(PCIDevice *pci_dev, int irq_num);
 void xen_piix3_set_irq(void *opaque, int irq_num, int level);
 void xen_piix_pci_write_config_client(uint32_t address, uint32_t val, int len);
 
+qemu_irq *xen_interrupt_controller_init(void);
+
 int xen_init(void);
 int xen_hvm_init(void);
 void xen_vcpu_init(void);