[Qemu-devel] [PATCH v4 4/4] target-ppc: Add support for new nmi_monitor_handler() CPU callback

[Alexey Kardashevskiy <aik@ozlabs.ru>]

This defines a nmi_monitor_handler() callback for POWERPC CPU class so
the "nmi" HMP/QMP command gets supported for POWERPC machines.

This calls POWERPC_EXCP_RESET (vector 0x100) in the guest to deliver NMI.
The expected result is XMON (in-kernel debugger) invocation.

Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
---
Changes:
v4:
* s/\<nmi\>/nmi_monitor_handler/
* added note about XMON into commit log

v3:
* ppc_cpu_do_nmi() is exported from excp_helper.c instead of powerpc_excp()
---
 target-ppc/cpu-qom.h        |  1 +
 target-ppc/excp_helper.c    |  8 ++++++++
 target-ppc/translate_init.c | 17 +++++++++++++++++
 3 files changed, 26 insertions(+)

diff --git a/target-ppc/cpu-qom.h b/target-ppc/cpu-qom.h
index 47dc8e6..fe7d602 100644
--- a/target-ppc/cpu-qom.h
+++ b/target-ppc/cpu-qom.h
@@ -119,6 +119,7 @@ int ppc64_cpu_write_elf64_qemunote(WriteCoreDumpFunction f,
 int ppc64_cpu_write_elf64_note(WriteCoreDumpFunction f, CPUState *cs,
                                int cpuid, void *opaque);
 #ifndef CONFIG_USER_ONLY
+void ppc_cpu_do_nmi(CPUState *cs);
 extern const struct VMStateDescription vmstate_ppc_cpu;
 #endif
 
diff --git a/target-ppc/excp_helper.c b/target-ppc/excp_helper.c
index a0c9fdc..11c23e7 100644
--- a/target-ppc/excp_helper.c
+++ b/target-ppc/excp_helper.c
@@ -801,6 +801,14 @@ void ppc_hw_interrupt(CPUPPCState *env)
         }
     }
 }
+
+void ppc_cpu_do_nmi(CPUState *cs)
+{
+    PowerPCCPU *cpu = POWERPC_CPU(cs);
+    CPUPPCState *env = &cpu->env;
+
+    powerpc_excp(cpu, env->excp_model, POWERPC_EXCP_RESET);
+}
 #endif /* !CONFIG_USER_ONLY */
 
 #if defined(DEBUG_OP)
diff --git a/target-ppc/translate_init.c b/target-ppc/translate_init.c
index 4d94015..72bdce3 100644
--- a/target-ppc/translate_init.c
+++ b/target-ppc/translate_init.c
@@ -8510,6 +8510,22 @@ static void ppc_cpu_initfn(Object *obj)
     }
 }
 
+#ifndef CONFIG_USER_ONLY
+static void ppc_cpu_do_nmi_on_cpu(void *arg)
+{
+    CPUState *cs = arg;
+
+    cpu_synchronize_state(cs);
+    ppc_cpu_do_nmi(cs);
+}
+
+static int ppc_cpu_nmi_monitor_handler(CPUState *cs)
+{
+    async_run_on_cpu(cs, ppc_cpu_do_nmi_on_cpu, cs);
+    return 0;
+}
+#endif
+
 static void ppc_cpu_class_init(ObjectClass *oc, void *data)
 {
     PowerPCCPUClass *pcc = POWERPC_CPU_CLASS(oc);
@@ -8536,6 +8552,7 @@ static void ppc_cpu_class_init(ObjectClass *oc, void *data)
 #ifdef CONFIG_USER_ONLY
     cc->handle_mmu_fault = ppc_cpu_handle_mmu_fault;
 #else
+    cc->nmi_monitor_handler = ppc_cpu_nmi_monitor_handler;
     cc->get_phys_page_debug = ppc_cpu_get_phys_page_debug;
     cc->vmsd = &vmstate_ppc_cpu;
 #if defined(TARGET_PPC64)
-- 
2.0.0