Document cpu_x86_fill_model_id() and define CPUID_MODEL_ID_SZ to
help callers use the right buffer size.

Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
Message-Id: <20170712162058.10538-4-ehabkost@redhat.com>
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
---
 target/i386/cpu.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/target/i386/cpu.c b/target/i386/cpu.c
index 156dc95..8558c60 100644
--- a/target/i386/cpu.c
+++ b/target/i386/cpu.c
@@ -1585,6 +1585,17 @@ static bool lmce_supported(void)
     return !!(mce_cap & MCG_LMCE_P);
 }
 
+#define CPUID_MODEL_ID_SZ 48
+
+/**
+ * cpu_x86_fill_model_id:
+ * Get CPUID model ID string from host CPU.
+ *
+ * @str should have at least CPUID_MODEL_ID_SZ bytes
+ *
+ * The function does NOT add a null terminator to the string
+ * automatically.
+ */
 static int cpu_x86_fill_model_id(char *str)
 {
     uint32_t eax = 0, ebx = 0, ecx = 0, edx = 0;
-- 
2.9.4