[Qemu-devel] [PATCH RFC V3 06/12] xen: add a 8259 Interrupt Controller

[anthony.perard@citrix.com]

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

Introduce a 8259 Interrupt Controller for target-xen; 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/xen_common.h     |    2 ++
 hw/xen_machine_fv.c |    5 ++---
 xen-all.c           |   12 ++++++++++++
 3 files changed, 16 insertions(+), 3 deletions(-)

diff --git a/hw/xen_common.h b/hw/xen_common.h
index 2cbc376..dd54063 100644
--- a/hw/xen_common.h
+++ b/hw/xen_common.h
@@ -52,4 +52,6 @@ typedef xc_interface *qemu_xc_interface;
 # define xc_fd(xen_xc)                          (*(int*)xen_xc)
 #endif
 
+qemu_irq *i8259_xen_init(void);
+
 #endif /* QEMU_HW_XEN_COMMON_H */
diff --git a/hw/xen_machine_fv.c b/hw/xen_machine_fv.c
index 65fd44a..dfdff55 100644
--- a/hw/xen_machine_fv.c
+++ b/hw/xen_machine_fv.c
@@ -35,6 +35,7 @@
 
 #include "xen/hvm/hvm_info_table.h"
 #include "xen_platform.h"
+#include "xen_common.h"
 
 #define MAX_IDE_BUS 2
 
@@ -50,7 +51,6 @@ static void xen_init_fv(ram_addr_t ram_size,
     PCIBus *pci_bus;
     PCII440FXState *i440fx_state;
     int piix3_devfn = -1;
-    qemu_irq *cpu_irq;
     qemu_irq *isa_irq;
     qemu_irq *i8259;
     qemu_irq *cmos_s3;
@@ -74,8 +74,7 @@ static void xen_init_fv(ram_addr_t ram_size,
     env = cpu_init(cpu_model);
     env->halted = 1;
 
-    cpu_irq = pc_allocate_cpu_irq();
-    i8259 = i8259_init(cpu_irq[0]);
+    i8259 = i8259_xen_init();
     isa_irq_state = qemu_mallocz(sizeof(*isa_irq_state));
     isa_irq_state->i8259 = i8259;
 
diff --git a/xen-all.c b/xen-all.c
index 948e439..765f87a 100644
--- a/xen-all.c
+++ b/xen-all.c
@@ -40,6 +40,18 @@ void xen_piix_pci_write_config_client(uint32_t address, uint32_t val, int len)
     }
 }
 
+/* i8259 */
+
+static void i8259_set_irq(void *opaque, int irq, int level)
+{
+    xc_hvm_set_isa_irq_level(xen_xc, xen_domid, irq, level);
+}
+
+qemu_irq *i8259_xen_init(void)
+{
+    return qemu_allocate_irqs(i8259_set_irq, NULL, 16);
+}
+
 /* Initialise Xen */
 
 int xen_init(int smp_cpus)
-- 
1.6.5