[Qemu-devel] [PATCH v2 1/3] cpu: make CPU_INTERRUPT_RESET available on all targets

[Paolo Bonzini <pbonzini@redhat.com>]

On the x86, some devices need access to the CPU reset pin (INIT#).
Provide a generic service to do this, using one of the internal
cpu_interrupt targets.  Generalize the PPC-specific code for
CPU_INTERRUPT_RESET to other targets, and provide a function that
will raise the interrupt on all CPUs.

Since PPC does not support migration, I picked the value that is
used on x86, CPU_INTERRUPT_TGT_INT_1.  No other arch used to use
CPU_INTERRUPT_TGT_INT_1.

Reviewed-by: Anthony Liguori <aliguori@us.ibm.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
 cpu-exec.c             | 24 ++++++++++++++----------
 cpus.c                 |  9 +++++++++
 include/exec/cpu-all.h |  8 +++++---
 include/sysemu/cpus.h  |  1 +
 target-i386/cpu.h      |  7 ++++---
 target-ppc/cpu.h       |  3 ---
 6 files changed, 33 insertions(+), 19 deletions(-)

diff --git a/cpu-exec.c b/cpu-exec.c
index 94fedc5..f400676 100644
--- a/cpu-exec.c
+++ b/cpu-exec.c
@@ -304,19 +304,26 @@ int cpu_exec(CPUArchState *env)
                     }
 #endif
 #if defined(TARGET_I386)
-#if !defined(CONFIG_USER_ONLY)
-                    if (interrupt_request & CPU_INTERRUPT_POLL) {
-                        cpu->interrupt_request &= ~CPU_INTERRUPT_POLL;
-                        apic_poll_irq(env->apic_state);
-                    }
-#endif
                     if (interrupt_request & CPU_INTERRUPT_INIT) {
                             cpu_svm_check_intercept_param(env, SVM_EXIT_INIT,
                                                           0);
                             do_cpu_init(x86_env_get_cpu(env));
                             env->exception_index = EXCP_HALTED;
                             cpu_loop_exit(env);
-                    } else if (interrupt_request & CPU_INTERRUPT_SIPI) {
+                    }
+#else
+                    if ((interrupt_request & CPU_INTERRUPT_RESET)) {
+                        cpu_reset(cpu);
+                    }
+#endif
+#if defined(TARGET_I386)
+#if !defined(CONFIG_USER_ONLY)
+                    if (interrupt_request & CPU_INTERRUPT_POLL) {
+                        cpu->interrupt_request &= ~CPU_INTERRUPT_POLL;
+                        apic_poll_irq(env->apic_state);
+                    }
+#endif
+                    if (interrupt_request & CPU_INTERRUPT_SIPI) {
                             do_cpu_sipi(x86_env_get_cpu(env));
                     } else if (env->hflags2 & HF2_GIF_MASK) {
                         if ((interrupt_request & CPU_INTERRUPT_SMI) &&
@@ -370,9 +377,6 @@ int cpu_exec(CPUArchState *env)
                         }
                     }
 #elif defined(TARGET_PPC)
-                    if ((interrupt_request & CPU_INTERRUPT_RESET)) {
-                        cpu_reset(cpu);
-                    }
                     if (interrupt_request & CPU_INTERRUPT_HARD) {
                         ppc_hw_interrupt(env);
                         if (env->pending_interrupts == 0) {
diff --git a/cpus.c b/cpus.c
index e919dd7..87d471a 100644
--- a/cpus.c
+++ b/cpus.c
@@ -405,6 +405,15 @@ void hw_error(const char *fmt, ...)
     abort();
 }
 
+void cpu_reset_all_async(void)
+{
+    CPUArchState *env;
+
+    for (env = first_cpu; env; env = env->next_cpu) {
+        cpu_interrupt(ENV_GET_CPU(env), CPU_INTERRUPT_RESET);
+    }
+}
+
 void cpu_synchronize_all_states(void)
 {
     CPUArchState *cpu;
diff --git a/include/exec/cpu-all.h b/include/exec/cpu-all.h
index e9c3717..62d2654 100644
--- a/include/exec/cpu-all.h
+++ b/include/exec/cpu-all.h
@@ -392,6 +392,9 @@ DECLARE_TLS(CPUArchState *,cpu_single_env);
 /* Debug event pending.  */
 #define CPU_INTERRUPT_DEBUG       0x0080
 
+/* Reset signal.  */
+#define CPU_INTERRUPT_RESET       0x0400
+
 /* Several target-specific external hardware interrupts.  Each target/cpu.h
    should define proper names based on these defines.  */
 #define CPU_INTERRUPT_TGT_EXT_0   0x0008
@@ -406,9 +409,8 @@ DECLARE_TLS(CPUArchState *,cpu_single_env);
    instruction being executed.  These, therefore, are not masked while
    single-stepping within the debugger.  */
 #define CPU_INTERRUPT_TGT_INT_0   0x0100
-#define CPU_INTERRUPT_TGT_INT_1   0x0400
-#define CPU_INTERRUPT_TGT_INT_2   0x0800
-#define CPU_INTERRUPT_TGT_INT_3   0x2000
+#define CPU_INTERRUPT_TGT_INT_1   0x0800
+#define CPU_INTERRUPT_TGT_INT_2   0x2000
 
 /* First unused bit: 0x4000.  */
 
diff --git a/include/sysemu/cpus.h b/include/sysemu/cpus.h
index 6502488..87b9829 100644
--- a/include/sysemu/cpus.h
+++ b/include/sysemu/cpus.h
@@ -7,6 +7,7 @@ void resume_all_vcpus(void);
 void pause_all_vcpus(void);
 void cpu_stop_current(void);
 
+void cpu_reset_all_async(void);
 void cpu_synchronize_all_states(void);
 void cpu_synchronize_all_post_reset(void);
 void cpu_synchronize_all_post_init(void);
diff --git a/target-i386/cpu.h b/target-i386/cpu.h
index 48f41ca..c7b8176 100644
--- a/target-i386/cpu.h
+++ b/target-i386/cpu.h
@@ -577,10 +577,11 @@ typedef uint32_t FeatureWordArray[FEATURE_WORDS];
 #define CPU_INTERRUPT_NMI       CPU_INTERRUPT_TGT_EXT_3
 #define CPU_INTERRUPT_MCE       CPU_INTERRUPT_TGT_EXT_4
 #define CPU_INTERRUPT_VIRQ      CPU_INTERRUPT_TGT_INT_0
-#define CPU_INTERRUPT_INIT      CPU_INTERRUPT_TGT_INT_1
-#define CPU_INTERRUPT_SIPI      CPU_INTERRUPT_TGT_INT_2
-#define CPU_INTERRUPT_TPR       CPU_INTERRUPT_TGT_INT_3
+#define CPU_INTERRUPT_SIPI      CPU_INTERRUPT_TGT_INT_1
+#define CPU_INTERRUPT_TPR       CPU_INTERRUPT_TGT_INT_2
 
+/* CPU_INTERRUPT_RESET acts as the INIT# pin.  */
+#define CPU_INTERRUPT_INIT      CPU_INTERRUPT_RESET
 
 typedef enum {
     CC_OP_DYNAMIC, /* must use dynamic code to get cc_op */
diff --git a/target-ppc/cpu.h b/target-ppc/cpu.h
index 4604a28..ceb0a12 100644
--- a/target-ppc/cpu.h
+++ b/target-ppc/cpu.h
@@ -2084,9 +2084,6 @@ enum {
     PPC_INTERRUPT_PERFM,          /* Performance monitor interrupt        */
 };
 
-/* CPU should be reset next, restart from scratch afterwards */
-#define CPU_INTERRUPT_RESET       CPU_INTERRUPT_TGT_INT_0
-
 /*****************************************************************************/
 
 static inline target_ulong cpu_read_xer(CPUPPCState *env)
-- 
1.8.1.2