[Qemu-devel] [QEMU PATCH 2/3] per-machine-type CPU model alias system

[Eduardo Habkost <ehabkost@redhat.com>]

This allow QEMUMachine structs to contain a list of CPU model aliases,
used to keep command-line compatibility with older machine types, while
making CPU model fixes available on newer machine types.

Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
---
 hw/boards.h |    6 ++++++
 vl.c        |   14 ++++++++++++++
 2 files changed, 20 insertions(+)

diff --git a/hw/boards.h b/hw/boards.h
index f20f5ab..ad48399 100644
--- a/hw/boards.h
+++ b/hw/boards.h
@@ -12,6 +12,11 @@ typedef void QEMUMachineInitFunc(ram_addr_t ram_size,
                                  const char *initrd_filename,
                                  const char *cpu_model);
 
+
+typedef struct CPUModelAlias {
+    const char *alias, *cpu_model;
+} CPUModelAlias;
+
 typedef struct QEMUMachine {
     const char *name;
     const char *alias;
@@ -27,6 +32,7 @@ typedef struct QEMUMachine {
         no_sdcard:1;
     int is_default;
     const char *default_machine_opts;
+    struct CPUModelAlias *cpu_aliases;
     GlobalProperty *compat_props;
     struct QEMUMachine *next;
     const char *hw_version;
diff --git a/vl.c b/vl.c
index 34cc145..cd87e06 100644
--- a/vl.c
+++ b/vl.c
@@ -1209,6 +1209,19 @@ QEMUMachine *find_default_machine(void)
     return NULL;
 }
 
+static const char *qemu_machine_resolve_cpu_model(QEMUMachine *m,
+                                                  const char *cpu_model)
+{
+    if (cpu_model && m->cpu_aliases) {
+        CPUModelAlias *a;
+        for (a = m->cpu_aliases; a->alias; a++) {
+            if (!strcmp(cpu_model, a->alias))
+                return a->cpu_model;
+        }
+    }
+    return cpu_model;
+}
+
 void qemu_machine_init(QEMUMachine *machine,
                        ram_addr_t ram_size,
                        const char *boot_devices,
@@ -1217,6 +1230,7 @@ void qemu_machine_init(QEMUMachine *machine,
                        const char *initrd_filename,
                        const char *cpu_model)
 {
+    cpu_model = qemu_machine_resolve_cpu_model(machine, cpu_model);
     machine->init(ram_size, boot_devices,
                   kernel_filename, kernel_cmdline, initrd_filename, cpu_model);
 }
-- 
1.7.10.4