[PATCH 5/6] Redirect cpu_interrupt to callback handler

[Marcelo Tosatti <mtosatti@xxxxxxxxxx>]

From: Jan Kiszka <jan.kiszka@xxxxxxxxxxx>

This allows to override the interrupt handling of QEMU in system mode.
KVM will make use of it to set a specialized handler.

Signed-off-by: Jan Kiszka <jan.kiszka@xxxxxxxxxxx>
Signed-off-by: Marcelo Tosatti <mtosatti@xxxxxxxxxx>
---
 cpu-all.h |   14 +++++++++++++-
 exec.c    |    4 +++-
 2 files changed, 16 insertions(+), 2 deletions(-)

diff --git a/cpu-all.h b/cpu-all.h
index dc0f2f0..628206e 100644
--- a/cpu-all.h
+++ b/cpu-all.h
@@ -789,7 +789,19 @@ extern CPUState *cpu_single_env;
 #define CPU_INTERRUPT_SIPI   0x800 /* SIPI pending. */
 #define CPU_INTERRUPT_MCE    0x1000 /* (x86 only) MCE pending. */
 
-void cpu_interrupt(CPUState *s, int mask);
+#ifndef CONFIG_USER_ONLY
+typedef void (*CPUInterruptHandler)(CPUState *, int);
+
+extern CPUInterruptHandler cpu_interrupt_handler;
+
+static inline void cpu_interrupt(CPUState *s, int mask)
+{
+    cpu_interrupt_handler(s, mask);
+}
+#else /* USER_ONLY */
+void cpu_interrupt(CPUState *env, int mask);
+#endif /* USER_ONLY */
+
 void cpu_reset_interrupt(CPUState *env, int mask);
 
 void cpu_exit(CPUState *s);
diff --git a/exec.c b/exec.c
index cc0806e..72f4784 100644
--- a/exec.c
+++ b/exec.c
@@ -1632,7 +1632,7 @@ static void cpu_unlink_tb(CPUState *env)
 
 #ifndef CONFIG_USER_ONLY
 /* mask must never be zero, except for A20 change call */
-void cpu_interrupt(CPUState *env, int mask)
+static void tcg_handle_interrupt(CPUState *env, int mask)
 {
     int old_mask;
 
@@ -1659,6 +1659,8 @@ void cpu_interrupt(CPUState *env, int mask)
     }
 }
 
+CPUInterruptHandler cpu_interrupt_handler = tcg_handle_interrupt;
+
 #else /* CONFIG_USER_ONLY */
 
 void cpu_interrupt(CPUState *env, int mask)
-- 
1.7.4.2

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