From 07a5298c3067ed63f7d82d8c1a6f479146447289 Mon Sep 17 00:00:00 2001
From: Paolo Bonzini <pbonzini@redhat.com>
Date: Mon, 20 Aug 2012 15:23:28 +0200
Subject: [PATCH] virtio-scsi: add backwards-compatibility properties for 1.1
 and earlier machines

Hotplug and parameter change are new in 1.2, disable them via compat
properties for pc-1.1 and earlier.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
 hw/pc_piix.c     | 8 ++++++++
 hw/virtio-scsi.c | 7 -------
 hw/virtio-scsi.h | 9 ++++++++-
 3 files changed, 16 insertions(+), 8 deletions(-)

diff --git a/hw/pc_piix.c b/hw/pc_piix.c
index 0c0096fd7e..a960710af8 100644
--- a/hw/pc_piix.c
+++ b/hw/pc_piix.c
@@ -360,6 +360,14 @@ static QEMUMachine pc_machine_v1_2 = {
 
 #define PC_COMPAT_1_1 \
         {\
+            .driver   = "virtio-scsi-pci",\
+            .property = "hotplug",\
+            .value    = "off",\
+        },{\
+            .driver   = "virtio-scsi-pci",\
+            .property = "param_change",\
+            .value    = "off",\
+        },{\
             .driver   = "VGA",\
             .property = "vgamem_mb",\
             .value    = stringify(8),\
diff --git a/hw/virtio-scsi.c b/hw/virtio-scsi.c
index 5f737acd97..c1b47a8f4d 100644
--- a/hw/virtio-scsi.c
+++ b/hw/virtio-scsi.c
@@ -24,11 +24,6 @@
 #define VIRTIO_SCSI_MAX_TARGET  255
 #define VIRTIO_SCSI_MAX_LUN     16383
 
-/* Feature Bits */
-#define VIRTIO_SCSI_F_INOUT                    0
-#define VIRTIO_SCSI_F_HOTPLUG                  1
-#define VIRTIO_SCSI_F_CHANGE                   2
-
 /* Response codes */
 #define VIRTIO_SCSI_S_OK                       0
 #define VIRTIO_SCSI_S_OVERRUN                  1
@@ -561,8 +556,6 @@ static void virtio_scsi_set_config(VirtIODevice *vdev,
 static uint32_t virtio_scsi_get_features(VirtIODevice *vdev,
                                          uint32_t requested_features)
 {
-    requested_features |= (1UL << VIRTIO_SCSI_F_HOTPLUG);
-    requested_features |= (1UL << VIRTIO_SCSI_F_CHANGE);
     return requested_features;
 }
 
diff --git a/hw/virtio-scsi.h b/hw/virtio-scsi.h
index 4bc889de02..91924f6dfc 100644
--- a/hw/virtio-scsi.h
+++ b/hw/virtio-scsi.h
@@ -21,6 +21,11 @@
 /* The ID for virtio_scsi */
 #define VIRTIO_ID_SCSI  8
 
+/* Feature Bits */
+#define VIRTIO_SCSI_F_INOUT                    0
+#define VIRTIO_SCSI_F_HOTPLUG                  1
+#define VIRTIO_SCSI_F_CHANGE                   2
+
 struct VirtIOSCSIConf {
     uint32_t num_queues;
     uint32_t max_sectors;
@@ -31,6 +36,8 @@ struct VirtIOSCSIConf {
     DEFINE_VIRTIO_COMMON_FEATURES(_state, _features_field), \
     DEFINE_PROP_UINT32("num_queues", _state, _conf_field.num_queues, 1), \
     DEFINE_PROP_UINT32("max_sectors", _state, _conf_field.max_sectors, 0xFFFF), \
-    DEFINE_PROP_UINT32("cmd_per_lun", _state, _conf_field.cmd_per_lun, 128)
+    DEFINE_PROP_UINT32("cmd_per_lun", _state, _conf_field.cmd_per_lun, 128), \
+    DEFINE_PROP_BIT("hotplug", _state, _features_field, VIRTIO_SCSI_F_HOTPLUG, true), \
+    DEFINE_PROP_BIT("param_change", _state, _features_field, VIRTIO_SCSI_F_CHANGE, true)
 
 #endif /* _QEMU_VIRTIO_SCSI_H */