[Qemu-devel] [RFC] make write_elf_xx functions part of CPUClass, use CPUState

[Jens Freimann <jfrei@linux.vnet.ibm.com>]

Hi Andreas,

not sure if this is what you had in mind. Does it at least go into the right direction?
It is pretty much untested and won't compile as is. I just wanted to get your opinion 
before putting more work into this.

This patch adds 4 write_elf_XX functions to the CPUClass which can be implemented
by XXXCPUState, e.g. S390CPUstate.

Would it make sense to have paging_enabled/HAVE_MEMORY_MAPPING also as a property
of the CPU object?

Signed-off-by: Jens Freimann <jfrei@linux.vnet.ibm.com>
---
 dump.c                   | 28 +++++++++++++++++++++++----
 include/qom/cpu.h        | 49 ++++++++++++++++++++++++++++++++++++++++++++++++
 include/sysemu/dump.h    |  9 +--------
 qom/cpu.c                | 44 +++++++++++++++++++++++++++++++++++++++++++
 target-s390x/arch_dump.c | 25 ++++--------------------
 target-s390x/arch_dump.h | 14 ++++++++++++++
 target-s390x/cpu.c       |  6 ++++++
 7 files changed, 142 insertions(+), 33 deletions(-)
 create mode 100644 target-s390x/arch_dump.h

diff --git a/dump.c b/dump.c
index 574c292..df49845 100644
--- a/dump.c
+++ b/dump.c
@@ -272,13 +272,19 @@ static int write_elf64_notes(DumpState *s)
 {
     CPUArchState *env;
     CPUState *cpu;
+    CPUClass *cc;
     int ret;
     int id;
 
     for (env = first_cpu; env != NULL; env = env->next_cpu) {
         cpu = ENV_GET_CPU(env);
+        cc = CPU_GET_CLASS(cpu);
         id = cpu_index(cpu);
-        ret = cpu_write_elf64_note(fd_write_vmcore, env, id, s);
+        if (cc->write_elf64_note)
+            ret = cc->write_elf64_note(fd_write_vmcore, cpu, id, s);
+        else {
+            ret = 0;
+        }
         if (ret < 0) {
             dump_error(s, "dump: failed to write elf notes.\n");
             return -1;
@@ -286,7 +292,11 @@ static int write_elf64_notes(DumpState *s)
     }
 
     for (env = first_cpu; env != NULL; env = env->next_cpu) {
-        ret = cpu_write_elf64_qemunote(fd_write_vmcore, env, s);
+        if (cc->write_elf64_qemunote)
+            ret = cc->write_elf64_qemunote(fd_write_vmcore, cpu, s);
+        else {
+            ret = 0;
+        }
         if (ret < 0) {
             dump_error(s, "dump: failed to write CPU status.\n");
             return -1;
@@ -324,13 +334,19 @@ static int write_elf32_notes(DumpState *s)
 {
     CPUArchState *env;
     CPUState *cpu;
+    CPUClass *cc;
     int ret;
     int id;
 
     for (env = first_cpu; env != NULL; env = env->next_cpu) {
         cpu = ENV_GET_CPU(env);
+        cc = CPU_GET_CLASS(cpu);
         id = cpu_index(cpu);
-        ret = cpu_write_elf32_note(fd_write_vmcore, env, id, s);
+        if (cc->write_elf32_note) {
+            ret = cc->write_elf32_note(fd_write_vmcore, cpu, id, s);
+        } else {
+            ret = 0; 
+        }
         if (ret < 0) {
             dump_error(s, "dump: failed to write elf notes.\n");
             return -1;
@@ -338,7 +354,11 @@ static int write_elf32_notes(DumpState *s)
     }
 
     for (env = first_cpu; env != NULL; env = env->next_cpu) {
-        ret = cpu_write_elf32_qemunote(fd_write_vmcore, env, s);
+        if (cc->write_elf32_qemunote) {
+            ret = cc->write_elf32_qemunote(fd_write_vmcore, cpu, s);
+        } else {
+            ret = 0; 
+        }
         if (ret < 0) {
             dump_error(s, "dump: failed to write CPU status.\n");
             return -1;
diff --git a/include/qom/cpu.h b/include/qom/cpu.h
index ab2657c..53199f1 100644
--- a/include/qom/cpu.h
+++ b/include/qom/cpu.h
@@ -24,6 +24,8 @@
 #include "hw/qdev-core.h"
 #include "qemu/thread.h"
 
+typedef int (*write_core_dump_function)(void *buf, size_t size, void *opaque);
+
 /**
  * SECTION:cpu
  * @section_id: QEMU-cpu
@@ -55,6 +57,14 @@ typedef struct CPUClass {
     ObjectClass *(*class_by_name)(const char *cpu_model);
 
     void (*reset)(CPUState *cpu);
+    int (*write_elf64_note)(write_core_dump_function f, CPUState *cpu,
+            int cpuid, void *opaque);
+    int (*write_elf64_qemunote)(write_core_dump_function f, CPUState *cpu,
+            void *opaque);
+    int (*write_elf32_note)(write_core_dump_function f, CPUState *cpu,
+            int cpuid, void *opaque);
+    int (*write_elf32_qemunote)(write_core_dump_function f, CPUState *cpu,
+            void *opaque);
 } CPUClass;
 
 struct KVMState;
@@ -116,6 +126,45 @@ struct CPUState {
     int cpu_index; /* used by alpha TCG */
 };
 
+/**
+ * cpu_write_elf64_note:
+ * @f: pointer to a function that writes memory to a file 
+ * @cpu: The CPU whose memory is to be dumped
+ * @cpuid: ID number of the CPU 
+ * @opaque: pointer to the CPUState struct
+ */
+int cpu_write_elf64_note(write_core_dump_function f, CPUState *cpu,
+        int cpuid, void *opaque);
+
+/**
+ * cpu_write_elf64_qemunote:
+ * @f: pointer to a function that writes memory to a file 
+ * @cpu: The CPU whose memory is to be dumped
+ * @cpuid: ID number of the CPU 
+ * @opaque: pointer to the CPUState struct
+ */
+int cpu_write_elf64_qemunote(write_core_dump_function f, CPUState *cpu,
+        void *opaque);
+
+/**
+ * cpu_write_elf32_note:
+ * @f: pointer to a function that writes memory to a file 
+ * @cpu: The CPU whose memory is to be dumped
+ * @cpuid: ID number of the CPU 
+ * @opaque: pointer to the CPUState struct
+ */
+int cpu_write_elf32_note(write_core_dump_function f, CPUState *cpu,
+        int cpuid, void *opaque);
+
+/**
+ * cpu_write_elf32_qemunote:
+ * @f: pointer to a function that writes memory to a file 
+ * @cpu: The CPU whose memory is to be dumped
+ * @cpuid: ID number of the CPU 
+ * @opaque: pointer to the CPUState struct
+ */
+int cpu_write_elf32_qemunote(write_core_dump_function f, CPUState *cpu,
+        void *opaque);
 
 /**
  * cpu_reset:
diff --git a/include/sysemu/dump.h b/include/sysemu/dump.h
index b03efd4..e5f9f7d 100644
--- a/include/sysemu/dump.h
+++ b/include/sysemu/dump.h
@@ -16,6 +16,7 @@
 
 #include "qapi/error.h"
 #include "include/qapi/qmp/qerror.h"
+#include "qom/cpu.h"
 
 typedef struct ArchDumpInfo {
     int d_machine;  /* Architecture */
@@ -24,14 +25,6 @@ typedef struct ArchDumpInfo {
 } ArchDumpInfo;
 
 typedef int (*write_core_dump_function)(void *buf, size_t size, void *opaque);
-int cpu_write_elf64_note(write_core_dump_function f, CPUArchState *env,
-                                                  int cpuid, void *opaque);
-int cpu_write_elf32_note(write_core_dump_function f, CPUArchState *env,
-                                                  int cpuid, void *opaque);
-int cpu_write_elf64_qemunote(write_core_dump_function f, CPUArchState *env,
-                                                          void *opaque);
-int cpu_write_elf32_qemunote(write_core_dump_function f, CPUArchState *env,
-                                                          void *opaque);
 int cpu_get_dump_info(ArchDumpInfo *info);
 ssize_t cpu_get_note_size(int class, int machine, int nr_cpus);
 
diff --git a/qom/cpu.c b/qom/cpu.c
index 0a2194d..e2822d0 100644
--- a/qom/cpu.c
+++ b/qom/cpu.c
@@ -21,6 +21,50 @@
 #include "qom/cpu.h"
 #include "qemu-common.h"
 
+int cpu_write_elf32_qemunote(write_core_dump_function f, CPUState *cpu,
+        void *opaque)
+{
+    CPUClass *klass = CPU_GET_CLASS(cpu);
+
+    if (klass->write_elf32_qemunote != NULL) {
+        return (*klass->write_elf32_qemunote)(f, cpu, opaque);
+    }
+    return -1;
+}
+
+int cpu_write_elf32_note(write_core_dump_function f, CPUState *cpu,
+        int cpuid, void *opaque)
+{
+    CPUClass *klass = CPU_GET_CLASS(cpu);
+
+    if (klass->write_elf32_note != NULL) {
+        return (*klass->write_elf32_note)(f, cpu, cpuid, opaque);
+    }
+    return -1;
+}
+
+int cpu_write_elf64_qemunote(write_core_dump_function f, CPUState *cpu,
+        void *opaque)
+{
+    CPUClass *klass = CPU_GET_CLASS(cpu);
+
+    if (klass->write_elf64_note != NULL) {
+        return (*klass->write_elf64_qemunote)(f, cpu, opaque);
+    }
+    return -1;
+}
+
+int cpu_write_elf64_note(write_core_dump_function f, CPUState *cpu,
+        int cpuid, void *opaque)
+{
+    CPUClass *klass = CPU_GET_CLASS(cpu);
+
+    if (klass->write_elf64_note != NULL) {
+        return (*klass->write_elf64_note)(f, cpu, cpuid, opaque);
+    }
+    return -1;
+}
+
 void cpu_reset(CPUState *cpu)
 {
     CPUClass *klass = CPU_GET_CLASS(cpu);
diff --git a/target-s390x/arch_dump.c b/target-s390x/arch_dump.c
index 18f2652..c594874 100644
--- a/target-s390x/arch_dump.c
+++ b/target-s390x/arch_dump.c
@@ -13,6 +13,7 @@
 
 #include "cpu.h"
 #include "elf.h"
+#include "arch_dump.h"
 #include "exec/cpu-all.h"
 #include "sysemu/dump.h"
 #include "sysemu/kvm.h"
@@ -186,10 +187,11 @@ static int s390x_write_all_elf64_notes(const char *note_name, write_core_dump_fu
 }
 
 
-int cpu_write_elf64_note(write_core_dump_function f, CPUArchState *env,
+int s390_cpu_write_elf64_note(write_core_dump_function f, CPUState *cpu,
                          int cpuid, void *opaque)
 {
-    return s390x_write_all_elf64_notes("CORE", f, env, cpuid, opaque);
+    S390CPU *_cpu = S390_CPU(cpu);
+    return s390x_write_all_elf64_notes("CORE", f, &_cpu->env, cpuid, opaque);
 }
 
 int cpu_get_dump_info(ArchDumpInfo *info)
@@ -222,25 +224,6 @@ ssize_t cpu_get_note_size(int class, int machine, int nr_cpus)
 
 }
 
-int cpu_write_elf32_note(write_core_dump_function f, CPUArchState *env,
-                         int cpuid, void *opaque)
-{
-    return 0;
-}
-
-
-int cpu_write_elf64_qemunote(write_core_dump_function f, CPUArchState *env,
-                             void *opaque)
-{
-    return 0;
-}
-
-int cpu_write_elf32_qemunote(write_core_dump_function f, CPUArchState *env,
-                             void *opaque)
-{
-    return 0;
-}
-
 int arch_check_parameter(bool paging, bool has_filter, int64_t begin, int64_t length, 
                           Error **errp)
 {
diff --git a/target-s390x/arch_dump.h b/target-s390x/arch_dump.h
new file mode 100644
index 0000000..8ebc24e
--- /dev/null
+++ b/target-s390x/arch_dump.h
@@ -0,0 +1,14 @@
+/*
+ * dump guest memory implementation 
+ *
+ * Copyright 2012 IBM Corp.
+ * Author(s): Jens Freimann <jfrei@linux.vnet.ibm.com>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or (at
+ * your option) any later version. See the COPYING file in the top-level
+ * directory.
+ */
+
+int s390_cpu_write_elf64_note(write_core_dump_function f, CPUState *cpu,
+                         int cpuid, void *opaque);
+
diff --git a/target-s390x/cpu.c b/target-s390x/cpu.c
index 14a9e9d..14b25d8 100644
--- a/target-s390x/cpu.c
+++ b/target-s390x/cpu.c
@@ -27,6 +27,7 @@
 #include "qemu-common.h"
 #include "qemu/timer.h"
 #include "hw/hw.h"
+#include "arch_dump.h"
 #ifndef CONFIG_USER_ONLY
 #include "hw/s390x/sclp.h"
 #include "sysemu/arch_init.h"
@@ -231,6 +232,11 @@ static void s390_cpu_class_init(ObjectClass *oc, void *data)
     scc->parent_reset = cc->reset;
     cc->reset = s390_cpu_reset;
 
+    cc->write_elf64_note = s390_cpu_write_elf64_note;
+    cc->write_elf64_qemunote = NULL;
+    cc->write_elf32_note = NULL;
+    cc->write_elf32_qemunote = NULL;
+
     dc->vmsd = &vmstate_s390_cpu;
 }
 
-- 
1.8.0.1