hw/boards: Add a MachineState parameter to kvm_type callback

On ARM, the kvm_type will be resolved by querying the KVMState.
Let's add the MachineState handle to the callback so that we
can retrieve the  KVMState handle. in kvm_init, when the callback
is called, the kvm_state variable is not yet set.
Signed-off-by: NEric Auger <eric.auger@redhat.com>
Acked-by: NDavid Gibson <david@gibson.dropbear.id.au>
Reviewed-by: NPeter Maydell <peter.maydell@linaro.org>
Reviewed-by: NIgor Mammedov <imammedo@redhat.com>
Message-id: 20190304101339.25970-5-eric.auger@redhat.com
[ppc parts]
Reviewed-by: NPeter Maydell <peter.maydell@linaro.org>
Reviewed-by: NIgor Mammedov <imammedo@redhat.com>
Signed-off-by: NPeter Maydell <peter.maydell@linaro.org>

accel/kvm/kvm-all.c

@@ -1593,7 +1593,7 @@ static int kvm_init(MachineState *ms)
 
     kvm_type = qemu_opt_get(qemu_get_machine_opts(), "kvm-type");
     if (mc->kvm_type) {
-        type = mc->kvm_type(kvm_type);
+        type = mc->kvm_type(ms, kvm_type);
     } else if (kvm_type) {
         ret = -EINVAL;
         fprintf(stderr, "Invalid argument kvm-type=%s\n", kvm_type);

hw/ppc/mac_newworld.c

@@ -564,8 +564,7 @@ static char *core99_fw_dev_path(FWPathProvider *p, BusState *bus,
 
     return NULL;
 }
-
-static int core99_kvm_type(const char *arg)
+static int core99_kvm_type(MachineState *machine, const char *arg)
 {
     /* Always force PR KVM */
     return 2;

hw/ppc/mac_oldworld.c

@@ -420,7 +420,7 @@ static char *heathrow_fw_dev_path(FWPathProvider *p, BusState *bus,
     return NULL;
 }
 
-static int heathrow_kvm_type(const char *arg)
+static int heathrow_kvm_type(MachineState *machine, const char *arg)
 {
     /* Always force PR KVM */
     return 2;

hw/ppc/spapr.c

@@ -3023,7 +3023,7 @@ static void spapr_machine_init(MachineState *machine)
     }
 }
 
-static int spapr_kvm_type(const char *vm_type)
+static int spapr_kvm_type(MachineState *machine, const char *vm_type)
 {
     if (!vm_type) {
         return 0;

include/hw/boards.h

@@ -156,6 +156,9 @@ typedef struct {
  *    should instead use "unimplemented-device" for all memory ranges where
  *    the guest will attempt to probe for a device that QEMU doesn't
  *    implement and a stub device is required.
+ * @kvm_type:
+ *    Return the type of KVM corresponding to the kvm-type string option or
+ *    computed based on other criteria such as the host kernel capabilities.
  */
 struct MachineClass {
     /*< private >*/
@@ -171,7 +174,7 @@ struct MachineClass {
     void (*init)(MachineState *state);
     void (*reset)(void);
     void (*hot_add_cpu)(const int64_t id, Error **errp);
-    int (*kvm_type)(const char *arg);
+    int (*kvm_type)(MachineState *machine, const char *arg);
 
     BlockInterfaceType block_default_type;
     int units_per_default_bus;