[Qemu-devel] [PATCH V10 08/15] xen: Introduce Xen Interrupt Controller

[anthony.perard@citrix.com]

From: Anthony PERARD <anthony.perard@citrix.com>

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>
---
 hw/pc_piix.c |    8 ++++++--
 hw/xen.h     |    2 ++
 xen-all.c    |   12 ++++++++++++
 xen-stub.c   |    5 +++++
 4 files changed, 25 insertions(+), 2 deletions(-)

diff --git a/hw/pc_piix.c b/hw/pc_piix.c
index 765877c..27d9030 100644
--- a/hw/pc_piix.c
+++ b/hw/pc_piix.c
@@ -98,8 +98,12 @@ static void pc_init1(ram_addr_t ram_size,
     pc_memory_init(ram_size, kernel_filename, kernel_cmdline, initrd_filename,
                    &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 2a53f8b..37d7b99 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);
+
 void pci_xen_platform_init(PCIBus *bus);
 
 int xen_init(int smp_cpus);
diff --git a/xen-all.c b/xen-all.c
index 123decb..73149f2 100644
--- a/xen-all.c
+++ b/xen-all.c
@@ -42,6 +42,18 @@ void xen_piix_pci_write_config_client(uint32_t address, uint32_t val, int len)
     }
 }
 
+/* Xen Interrupt Controller */
+
+static void xen_set_irq(void *opaque, int irq, int level)
+{
+    xc_hvm_set_isa_irq_level(xen_xc, xen_domid, irq, level);
+}
+
+qemu_irq *xen_interrupt_controller_init(void)
+{
+    return qemu_allocate_irqs(xen_set_irq, NULL, 16);
+}
+
 /* Initialise Xen */
 
 int xen_init(int smp_cpus)
diff --git a/xen-stub.c b/xen-stub.c
index ba95537..bc2ae12 100644
--- a/xen-stub.c
+++ b/xen-stub.c
@@ -24,6 +24,11 @@ void xen_piix_pci_write_config_client(uint32_t address, uint32_t val, int len)
 {
 }
 
+qemu_irq *xen_interrupt_controller_init(void)
+{
+    return NULL;
+}
+
 void pci_xen_platform_init(PCIBus *bus)
 {
 }
-- 
1.7.1