[PATCH v1 RFC 01/10] QEMU: introduce function cpudesc_avail

[Michael Mueller <mimu@xxxxxxxxxxxxxxxxxx>]

This patch introduces the function cpudesc_avail() which returns by
default true if not architecture specific implemented. Its intention
is to indicate if the cpu model description is available for display
by list_cpus(). This change allows cpu model descriptions to become
dynamically created by evaluating the runtime context.

Signed-off-by: Michael Mueller <mimu@xxxxxxxxxxxxxxxxxx>
Acked-by: Cornelia Huck <cornelia.huck@xxxxxxxxxx>
---
 arch_init.c                | 8 ++++++++
 include/sysemu/arch_init.h | 1 +
 vl.c                       | 2 +-
 3 files changed, 10 insertions(+), 1 deletion(-)

diff --git a/arch_init.c b/arch_init.c
index 995f56d..207d720 100644
--- a/arch_init.c
+++ b/arch_init.c
@@ -1346,6 +1346,14 @@ int xen_available(void)
 #endif
 }
 
+bool cpudesc_avail(void)
+{
+    bool is_avail = true;
+#if defined(cpudesc_ready)
+    is_avail = cpudesc_ready();
+#endif
+    return is_avail;
+}
 
 TargetInfo *qmp_query_target(Error **errp)
 {
diff --git a/include/sysemu/arch_init.h b/include/sysemu/arch_init.h
index 182d48d..cadcedc 100644
--- a/include/sysemu/arch_init.h
+++ b/include/sysemu/arch_init.h
@@ -35,6 +35,7 @@ void audio_init(void);
 int tcg_available(void);
 int kvm_available(void);
 int xen_available(void);
+bool cpudesc_avail(void);
 
 CpuDefinitionInfoList *arch_query_cpu_definitions(Error **errp);
 
diff --git a/vl.c b/vl.c
index 73e0661..ddd98f7 100644
--- a/vl.c
+++ b/vl.c
@@ -4009,7 +4009,7 @@ int main(int argc, char **argv, char **envp)
      */
     cpudef_init();
 
-    if (cpu_model && is_help_option(cpu_model)) {
+    if (cpudesc_avail() && cpu_model && is_help_option(cpu_model)) {
         list_cpus(stdout, &fprintf, cpu_model);
         exit(0);
     }
-- 
1.8.3.1

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