[PATCH 2/4] Userspace changes for configuring irq0->inti2 override (v3)

[Beth Kon <eak@us.ibm.com>]

Signed-off-by: Beth Kon <eak@us.ibm.com>

diff --git a/hw/fw_cfg.c b/hw/fw_cfg.c
index e1b19d7..bb74f38 100644
--- a/hw/fw_cfg.c
+++ b/hw/fw_cfg.c
@@ -279,6 +279,7 @@ void *fw_cfg_init(uint32_t ctl_port, uint32_t data_port,
     fw_cfg_add_bytes(s, FW_CFG_UUID, qemu_uuid, 16);
     fw_cfg_add_i16(s, FW_CFG_NOGRAPHIC, (uint16_t)nographic);
     fw_cfg_add_i16(s, FW_CFG_NB_CPUS, (uint16_t)smp_cpus);
+    fw_cfg_add_i16(s, FW_CFG_IRQ0_OVERRIDE, (uint16_t)irq0override);
 
     register_savevm("fw_cfg", -1, 1, fw_cfg_save, fw_cfg_load, s);
     qemu_register_reset(fw_cfg_reset, s);
diff --git a/hw/fw_cfg.h b/hw/fw_cfg.h
index f616ed2..1de7360 100644
--- a/hw/fw_cfg.h
+++ b/hw/fw_cfg.h
@@ -19,6 +19,7 @@
 
 #define FW_CFG_WRITE_CHANNEL    0x4000
 #define FW_CFG_ARCH_LOCAL       0x8000
+#define FW_CFG_IRQ0_OVERRIDE    (FW_CFG_ARCH_LOCAL + 2) 
 #define FW_CFG_ENTRY_MASK       ~(FW_CFG_WRITE_CHANNEL | FW_CFG_ARCH_LOCAL)
 
 #define FW_CFG_INVALID          0xffff
diff --git a/hw/ioapic.c b/hw/ioapic.c
index 0b70cf6..2d77a2c 100644
--- a/hw/ioapic.c
+++ b/hw/ioapic.c
@@ -23,6 +23,7 @@
 
 #include "hw.h"
 #include "pc.h"
+#include "sysemu.h"
 #include "qemu-timer.h"
 #include "host-utils.h"
 
@@ -95,14 +96,13 @@ void ioapic_set_irq(void *opaque, int vector, int level)
 {
     IOAPICState *s = opaque;
 
-#if 0
     /* ISA IRQs map to GSI 1-1 except for IRQ0 which maps
      * to GSI 2.  GSI maps to ioapic 1-1.  This is not
      * the cleanest way of doing it but it should work. */
 
-    if (vector == 0)
+    if (vector == 0 && irq0override) {
         vector = 2;
-#endif
+    }
 
     if (vector >= 0 && vector < IOAPIC_NUM_PINS) {
         uint32_t mask = 1 << vector;
diff --git a/qemu-kvm-x86.c b/qemu-kvm-x86.c
index 8cb6faa..2e52c87 100644
--- a/qemu-kvm-x86.c
+++ b/qemu-kvm-x86.c
@@ -879,7 +879,11 @@ int kvm_arch_init_irq_routing(void)
                 return r;
         }
         for (i = 0; i < 24; ++i) {
-            r = kvm_add_irq_route(kvm_context, i, KVM_IRQCHIP_IOAPIC, i);
+            if (i == 0) {
+                r = kvm_add_irq_route(kvm_context, i, KVM_IRQCHIP_IOAPIC, 2);
+            } else if (i != 2) {
+                r = kvm_add_irq_route(kvm_context, i, KVM_IRQCHIP_IOAPIC, i);
+            }
             if (r < 0)
                 return r;
         }
diff --git a/qemu-kvm.h b/qemu-kvm.h
index dd045dd..6a1968a 100644
--- a/qemu-kvm.h
+++ b/qemu-kvm.h
@@ -165,6 +165,7 @@ void qemu_kvm_cpu_stop(CPUState *env);
 #define kvm_enabled() (kvm_allowed)
 #define qemu_kvm_irqchip_in_kernel() kvm_irqchip_in_kernel(kvm_context)
 #define qemu_kvm_pit_in_kernel() kvm_pit_in_kernel(kvm_context)
+#define qemu_kvm_has_gsi_routing() kvm_has_gsi_routing(kvm_context)
 #define kvm_has_sync_mmu() qemu_kvm_has_sync_mmu()
 void kvm_init_vcpu(CPUState *env);
 void kvm_load_tsc(CPUState *env);
@@ -173,6 +174,7 @@ void kvm_load_tsc(CPUState *env);
 #define kvm_nested 0
 #define qemu_kvm_irqchip_in_kernel() (0)
 #define qemu_kvm_pit_in_kernel() (0)
+#define qemu_kvm_has_gsi_routing() (0)
 #define kvm_has_sync_mmu() (0)
 #define kvm_load_registers(env) do {} while(0)
 #define kvm_save_registers(env) do {} while(0)
diff --git a/sysemu.h b/sysemu.h
index 1f45fd6..292bbc3 100644
--- a/sysemu.h
+++ b/sysemu.h
@@ -93,6 +93,7 @@ extern int graphic_width;
 extern int graphic_height;
 extern int graphic_depth;
 extern int nographic;
+extern int irq0override;
 extern const char *keyboard_layout;
 extern int win2k_install_hack;
 extern int rtc_td_hack;
diff --git a/vl.c b/vl.c
index d9f0607..0bffc82 100644
--- a/vl.c
+++ b/vl.c
@@ -207,6 +207,7 @@ static int vga_ram_size;
 enum vga_retrace_method vga_retrace_method = VGA_RETRACE_DUMB;
 static DisplayState *display_state;
 int nographic;
+int irq0override;
 static int curses;
 static int sdl;
 const char* keyboard_layout = NULL;
@@ -5035,6 +5036,7 @@ int main(int argc, char **argv, char **envp)
     vga_ram_size = VGA_RAM_SIZE;
     snapshot = 0;
     nographic = 0;
+    irq0override = 1;
     curses = 0;
     kernel_filename = NULL;
     kernel_cmdline = "";
@@ -6129,8 +6131,14 @@ int main(int argc, char **argv, char **envp)
         }
     }
 
-    if (kvm_enabled())
-	kvm_init_ap();
+    if (kvm_enabled()) {
+       kvm_init_ap();
+#ifdef USE_KVM
+        if (kvm_irqchip && !qemu_kvm_has_gsi_routing()) {
+            irq0override = 0;
+        }
+#endif
+    }
 
     machine->init(ram_size, vga_ram_size, boot_devices,
                   kernel_filename, kernel_cmdline, initrd_filename, cpu_model);