[Qemu-devel] [PATCH 2/2] target-i386: make cpu_x86_create() get Error argument

[Eduardo Habkost]

Instead of forcing the caller to guess what went wrong while creating
the CPU object, return error information in a Error argument.

Also, as cpu_x86_create() won't print error messages itself anymore,
change cpu_x86_init() to print any error returned by cpu_x86_create()
or cpu_x86_realize().

Signed-off-by: Eduardo Habkost <ehabk...@redhat.com>
---
 target-i386/cpu.c    |  8 ++++++--
 target-i386/cpu.h    |  2 +-
 target-i386/helper.c | 21 ++++++++++++++-------
 3 files changed, 21 insertions(+), 10 deletions(-)

diff --git a/target-i386/cpu.c b/target-i386/cpu.c
index b242bf1..fba872d 100644
--- a/target-i386/cpu.c
+++ b/target-i386/cpu.c
@@ -1542,7 +1542,7 @@ static void filter_features_for_kvm(X86CPU *cpu)
 /* Create and initialize a X86CPU object, based on the full CPU model string
  * (that may include "+feature,-feature,feature=xxx" feature strings)
  */
-X86CPU *cpu_x86_create(const char *cpu_model)
+X86CPU *cpu_x86_create(const char *cpu_model, Error **errp)
 {
     X86CPU *cpu;
     CPUX86State *env;
@@ -1559,12 +1559,14 @@ X86CPU *cpu_x86_create(const char *cpu_model)
 
     model_pieces = g_strsplit(cpu_model, ",", 2);
     if (!model_pieces[0]) {
+        error_setg(errp, "invalid CPU model string: %s", cpu_model);
         goto error;
     }
     name = model_pieces[0];
     features = model_pieces[1];
 
     if (cpu_x86_find_by_name(def, name) < 0) {
+        error_setg(errp, "CPU model not found: %s", name);
         goto error;
     }
 
@@ -1575,13 +1577,15 @@ X86CPU *cpu_x86_create(const char *cpu_model)
                             &def->svm_features, &def->cpuid_7_0_ebx_features);
 
     if (cpu_x86_parse_featurestr(def, features) < 0) {
+        error_setg(errp, "Error parsing feature string: %s",
+                   features ? features : "(none)");
         goto error;
     }
 
     cpudef_2_x86_cpu(cpu, def, &error);
 
     if (error) {
-        fprintf(stderr, "%s\n", error_get_pretty(error));
+        error_propagate(errp, error);
         error_free(error);
         goto error;
     }
diff --git a/target-i386/cpu.h b/target-i386/cpu.h
index 3ebaae9..8ce9b9f 100644
--- a/target-i386/cpu.h
+++ b/target-i386/cpu.h
@@ -980,7 +980,7 @@ int cpu_x86_signal_handler(int host_signum, void *pinfo,
 void cpu_x86_cpuid(CPUX86State *env, uint32_t index, uint32_t count,
                    uint32_t *eax, uint32_t *ebx,
                    uint32_t *ecx, uint32_t *edx);
-X86CPU *cpu_x86_create(const char *cpu_model);
+X86CPU *cpu_x86_create(const char *cpu_model, Error **errp);
 void cpu_clear_apic_feature(CPUX86State *env);
 void host_cpuid(uint32_t function, uint32_t count,
                 uint32_t *eax, uint32_t *ebx, uint32_t *ecx, uint32_t *edx);
diff --git a/target-i386/helper.c b/target-i386/helper.c
index 23af4a8..dafa666 100644
--- a/target-i386/helper.c
+++ b/target-i386/helper.c
@@ -23,6 +23,7 @@
 #include "sysemu.h"
 #include "monitor.h"
 #endif
+#include "qemu-error.h"
 
 //#define DEBUG_MMU
 
@@ -1242,21 +1243,27 @@ int cpu_x86_get_descr_debug(CPUX86State *env, unsigned 
int selector,
 
 X86CPU *cpu_x86_init(const char *cpu_model)
 {
-    X86CPU *cpu;
+    X86CPU *cpu = NULL;
     Error *error = NULL;
 
-    cpu = cpu_x86_create(cpu_model);
-    if (!cpu) {
-        return NULL;
+    cpu = cpu_x86_create(cpu_model, &error);
+    if (error) {
+        goto error;
     }
 
     x86_cpu_realize(OBJECT(cpu), &error);
     if (error) {
-        error_free(error);
-        object_delete(OBJECT(cpu));
-        return NULL;
+        goto error;
     }
     return cpu;
+
+error:
+    if (cpu) {
+        object_delete(OBJECT(cpu));
+    }
+    error_report("%s", error_get_pretty(error));
+    error_free(error);
+    return NULL;
 }
 
 #if !defined(CONFIG_USER_ONLY)
-- 
1.7.11.7