[PATCH] machine: Add kvm-type property

[Eduardo Habkost <ehabkost@redhat.com>]

The kvm-type machine option was left out when MachineState was
introduced, preventing the kvm-type option from being used. Add the
missing property.

Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
Cc: Andreas Färber <afaerber@suse.de>
Cc: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Cc: Alexander Graf <agraf@suse.de>
Cc: Marcel Apfelbaum <marcel.a@redhat.com>
---
Tested in a x86 machine only. Help would be welcome to test it on a PPC
machine using -machine spapr and KVM.

Before this patch:

    $ qemu-system-x86_64 -machine pc,kvm-type=hv,accel=kvm
    qemu-system-x86_64: Property '.kvm-type' not found

(This means the option won't work even for sPAPR machines.)

After applying this patch:

    $ qemu-system-x86_64 -machine pc,kvm-type=hv,accel=kvm
    Invalid argument kvm-type=hv

(This means the x86 KVM init code is seeing (and rejecting) the option,
and the sPAPR code can use it.)

Note that qemu-system-x86_64 will segfault with the above command-line
unless an additional fix (submitted today) is applied (kvm: Ensure
negative return value on kvm_init() error handling path).
---
 hw/core/machine.c   | 17 +++++++++++++++++
 include/hw/boards.h |  1 +
 2 files changed, 18 insertions(+)

diff --git a/hw/core/machine.c b/hw/core/machine.c
index cbba679..ed47b3a 100644
--- a/hw/core/machine.c
+++ b/hw/core/machine.c
@@ -235,6 +235,21 @@ static void machine_set_firmware(Object *obj, const char *value, Error **errp)
     ms->firmware = g_strdup(value);
 }
 
+static char *machine_get_kvm_type(Object *obj, Error **errp)
+{
+    MachineState *ms = MACHINE(obj);
+
+    return g_strdup(ms->kvm_type);
+}
+
+static void machine_set_kvm_type(Object *obj, const char *value, Error **errp)
+{
+    MachineState *ms = MACHINE(obj);
+
+    g_free(ms->kvm_type);
+    ms->kvm_type = g_strdup(value);
+}
+
 static void machine_initfn(Object *obj)
 {
     object_property_add_str(obj, "accel",
@@ -274,6 +289,8 @@ static void machine_initfn(Object *obj)
     object_property_add_bool(obj, "usb", machine_get_usb, machine_set_usb, NULL);
     object_property_add_str(obj, "firmware",
                             machine_get_firmware, machine_set_firmware, NULL);
+    object_property_add_str(obj, "kvm-type",
+                            machine_get_kvm_type, machine_set_kvm_type, NULL);
 }
 
 static void machine_finalize(Object *obj)
diff --git a/include/hw/boards.h b/include/hw/boards.h
index 2d2e2be..44956d6 100644
--- a/include/hw/boards.h
+++ b/include/hw/boards.h
@@ -111,6 +111,7 @@ struct MachineState {
     bool mem_merge;
     bool usb;
     char *firmware;
+    char *kvm_type;
 
     ram_addr_t ram_size;
     const char *boot_order;
-- 
1.9.0