[Qemu-devel] [PATCH v3 3/7] vmxnet3: Introduce 'x-old-msi-offsets' backword compatability property

[Shmulik Ladkani]

Following the previous patches, where vmxnet3's pci's msi/msix
capability offsets and msix's PBA table offsets have been changed, this
patch introduces a boolean property 'x-old-msi-offsets' to vmxnet3,
whose default is false.

Setting 'x-old-msi-offsets' to 'on' preserves the old offsets behavior,
which allows migration to older versions.

Signed-off-by: Shmulik Ladkani <address@hidden>
---
 hw/net/vmxnet3.c    | 2 ++
 include/hw/compat.h | 4 ++++
 2 files changed, 6 insertions(+)

diff --git a/hw/net/vmxnet3.c b/hw/net/vmxnet3.c
index 97f0aea..d1fe888 100644
--- a/hw/net/vmxnet3.c
+++ b/hw/net/vmxnet3.c
@@ -2564,6 +2564,8 @@ static const VMStateDescription vmstate_vmxnet3 = {
 
 static Property vmxnet3_properties[] = {
     DEFINE_NIC_PROPERTIES(VMXNET3State, conf),
+    DEFINE_PROP_BIT("x-old-msi-offsets", VMXNET3State, compat_flags,
+                    VMXNET3_COMPAT_FLAG_OLD_MSI_OFFSETS_BIT, false),
     DEFINE_PROP_END_OF_LIST(),
 };
 
diff --git a/include/hw/compat.h b/include/hw/compat.h
index d0b1c4f..01e326d 100644
--- a/include/hw/compat.h
+++ b/include/hw/compat.h
@@ -18,6 +18,10 @@
             .driver   = "virtio-pci",\
             .property = "migrate-extra",\
             .value    = "off",\
+        },{\
+            .driver   = "vmxnet3",\
+            .property = "x-old-msi-offsets",\
+            .value    = "on",\
         },
 
 #define HW_COMPAT_2_3 \
-- 
1.9.1