[Qemu-devel] [PATCH 05/15] xen: add a 8259 Interrupt Controller

[stefano.stabellini@eu.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>
---
 Makefile.target             |    2 +-
 hw/xen_common.h             |    3 ++
 hw/xen_machine_fv.c         |    5 +--
 target-xen/i8259-xen-stub.c |   63 +++++++++++++++++++++++++++++++++++++++++++
 4 files changed, 69 insertions(+), 4 deletions(-)
 create mode 100644 target-xen/i8259-xen-stub.c

diff --git a/Makefile.target b/Makefile.target
index 63dc7d1..d1b63f2 100644
--- a/Makefile.target
+++ b/Makefile.target
@@ -319,7 +319,7 @@ libobj-y := $(filter-out $(bad-libobj-y), $(libobj-y))
 endif
 
 obj-xen-y += xen_machine_fv.o
-obj-xen-y += i8259.o
+obj-xen-y += i8259-xen-stub.o
 obj-xen-y += pc.o
 obj-xen-y += piix_pci.o
 obj-xen-y += mc146818rtc.o
diff --git a/hw/xen_common.h b/hw/xen_common.h
index 8a55b44..020fdd7 100644
--- a/hw/xen_common.h
+++ b/hw/xen_common.h
@@ -31,4 +31,7 @@
 # define xen_wmb() wmb()
 #endif
 
+/* hw/i8259-xen-stub.c */
+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 5fef7de..114addf 100644
--- a/hw/xen_machine_fv.c
+++ b/hw/xen_machine_fv.c
@@ -32,6 +32,7 @@
 #include "ide.h"
 #include "sysemu.h"
 
+#include "xen_common.h"
 #include "xen_backend.h"
 #include "xenstore.h"
 #include "xen/hvm/hvm_info_table.h"
@@ -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;
@@ -80,8 +80,7 @@ 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/target-xen/i8259-xen-stub.c b/target-xen/i8259-xen-stub.c
new file mode 100644
index 0000000..aa2aae1
--- /dev/null
+++ b/target-xen/i8259-xen-stub.c
@@ -0,0 +1,63 @@
+/* Xen 8259 stub for interrupt controller emulation
+ *
+ * Copyright (c) 2003-2004 Fabrice Bellard
+ * Copyright (c) 2005      Intel corperation
+ * Copyright (c) 2008      Citrix / Xensource
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include "hw/hw.h"
+#include "hw/pc.h"
+#include "monitor.h"
+#include "hw/xen_common.h"
+#include "hw/xen_backend.h"
+
+#include <xen/hvm/ioreq.h>
+
+PicState2 *isa_pic = NULL;
+
+void pic_update_irq(PicState2 *s)
+{
+}
+
+static void i8259_set_irq(void *opaque, int irq, int level)
+{
+    xc_hvm_set_isa_irq_level(xen_xc, xen_domid, irq, level);
+}
+
+int pic_read_irq(PicState2 *s)
+{
+    return -1;
+}
+
+void irq_info(Monitor *mon)
+{
+    monitor_printf(mon, "irq statistics not supported with Xen.\n");
+}
+
+void pic_info(Monitor *mon)
+{
+    monitor_printf(mon, "pic_info not supported with Xen .\n");
+}
+
+qemu_irq *i8259_xen_init(void)
+{
+    return qemu_allocate_irqs(i8259_set_irq, NULL, 16);
+}
-- 
1.7.0.4