[Qemu-devel] [PATCH 1/3] S390: Basic CPU model support

[Jens Freimann]

From: Viktor Mihajlovski <address@hidden>

This enables qemu -cpu ? to return the list of supported CPU models
on s390. Since only the host model is supported at this point in time
this is pretty straight-forward. Further, a validity check for the
requested CPU model was added.
This change is needed to allow libvirt exploiters (like OpenStack)
to specify a CPU model.

Signed-off-by: Viktor Mihajlovski <address@hidden>
Signed-off-by: Jens Freimann <address@hidden>
Reviewed-by: Christian Borntraeger <address@hidden>
---
 hw/s390-virtio.c   | 5 +++++
 target-s390x/cpu.c | 6 ++++++
 target-s390x/cpu.h | 3 +++
 3 files changed, 14 insertions(+)

diff --git a/hw/s390-virtio.c b/hw/s390-virtio.c
index 685cb54..7144ac1 100644
--- a/hw/s390-virtio.c
+++ b/hw/s390-virtio.c
@@ -209,6 +209,11 @@ static void s390_init(QEMUMachineInitArgs *args)
         cpu_model = "host";
     }
 
+    if (strcmp(cpu_model, "host")) {
+        fprintf(stderr, "S390 only supports host CPU model\n");
+        exit(1);
+    }
+
     ipi_states = g_malloc(sizeof(S390CPU *) * smp_cpus);
 
     for (i = 0; i < smp_cpus; i++) {
diff --git a/target-s390x/cpu.c b/target-s390x/cpu.c
index 619b202..03fdc31 100644
--- a/target-s390x/cpu.c
+++ b/target-s390x/cpu.c
@@ -25,6 +25,12 @@
 #include "qemu-timer.h"
 
 
+/* generate CPU information for cpu -? */
+void s390_cpu_list(FILE *f, fprintf_function cpu_fprintf)
+{
+    (*cpu_fprintf)(f, "s390 %16s\n", "[host]");
+}
+
 /* CPUClass::reset() */
 static void s390_cpu_reset(CPUState *s)
 {
diff --git a/target-s390x/cpu.h b/target-s390x/cpu.h
index 0f9a1f7..3513976 100644
--- a/target-s390x/cpu.h
+++ b/target-s390x/cpu.h
@@ -350,6 +350,9 @@ static inline void cpu_set_tls(CPUS390XState *env, 
target_ulong newtls)
 #define cpu_gen_code cpu_s390x_gen_code
 #define cpu_signal_handler cpu_s390x_signal_handler
 
+void s390_cpu_list(FILE *f, fprintf_function cpu_fprintf);
+#define cpu_list s390_cpu_list
+
 #include "exec-all.h"
 
 #ifdef CONFIG_USER_ONLY
-- 
1.7.12.4