[Qemu-devel] [PATCH v2 2/2] ipmi: Use proper struct reference for BT vmstate

[minyard]

From: Corey Minyard <address@hidden>

The vmstate for isa_ipmi_bt was referencing into the bt structure,
instead create a bt structure separate and use that.

The version 1 of the BT transfer was fairly broken, if a migration
occured during an IPMI operation, it is likely the migration would
be corrupted because I misunderstood the VMSTATE_VBUFFER_UINT32()
handling, I thought it handled transferring the length field,
too.  So I just remove support for that.  I doubt anyone is using
it at this point.

This also removes the transfer of use_irq, since that should come
from configuration.

Signed-off-by: Corey Minyard <address@hidden>
Cc: Dr. David Alan Gilbert <address@hidden>
---
 hw/ipmi/isa_ipmi_bt.c | 61 ++++++++++++++++++++++++++++++++++++++++-----------
 1 file changed, 48 insertions(+), 13 deletions(-)

diff --git a/hw/ipmi/isa_ipmi_bt.c b/hw/ipmi/isa_ipmi_bt.c
index e946030..b64dce2 100644
--- a/hw/ipmi/isa_ipmi_bt.c
+++ b/hw/ipmi/isa_ipmi_bt.c
@@ -450,22 +450,57 @@ static void isa_ipmi_bt_realize(DeviceState *dev, Error 
**errp)
     isa_register_ioport(isadev, &iib->bt.io, iib->bt.io_base);
 }
 
-static const VMStateDescription vmstate_ISAIPMIBTDevice = {
-    .name = TYPE_IPMI_INTERFACE,
+static int ipmi_bt_vmstate_post_load(void *opaque, int version)
+{
+    IPMIBT *ib = opaque;
+
+    /* Make sure all the values are sane. */
+    if (ib->outpos >= MAX_IPMI_MSG_SIZE || ib->outlen >= MAX_IPMI_MSG_SIZE ||
+        ib->outpos >= ib->outlen) {
+        ib->outpos = 0;
+        ib->outlen = 0;
+    }
+
+    if (ib->inlen >= MAX_IPMI_MSG_SIZE) {
+        ib->inlen = 0;
+    }
+
+    return 0;
+}
+
+const VMStateDescription vmstate_IPMIBT = {
+    .name = TYPE_IPMI_INTERFACE_PREFIX "bt",
     .version_id = 1,
     .minimum_version_id = 1,
+    .post_load = ipmi_bt_vmstate_post_load,
+    .fields      = (VMStateField[]) {
+        VMSTATE_BOOL(obf_irq_set, IPMIBT),
+        VMSTATE_BOOL(atn_irq_set, IPMIBT),
+        VMSTATE_BOOL(irqs_enabled, IPMIBT),
+        VMSTATE_UINT32(outpos, IPMIBT),
+        VMSTATE_UINT32(outlen, IPMIBT),
+        VMSTATE_UINT8_ARRAY(outmsg, IPMIBT, MAX_IPMI_MSG_SIZE),
+        VMSTATE_UINT32(inlen, IPMIBT),
+        VMSTATE_UINT8_ARRAY(inmsg, IPMIBT, MAX_IPMI_MSG_SIZE),
+        VMSTATE_UINT8(control_reg, IPMIBT),
+        VMSTATE_UINT8(mask_reg, IPMIBT),
+        VMSTATE_UINT8(waiting_rsp, IPMIBT),
+        VMSTATE_UINT8(waiting_seq, IPMIBT),
+        VMSTATE_END_OF_LIST()
+    }
+};
+
+static const VMStateDescription vmstate_ISAIPMIBTDevice = {
+    .name = TYPE_IPMI_INTERFACE_PREFIX "isa-bt",
+    .version_id = 2,
+    .minimum_version_id = 2,
+    /*
+     * Version 1 had messed up the array transfer, it's not even usable
+     * because it used VMSTATE_VBUFFER_UINT32, but it did not transfer
+     * the buffer length, so random things would happen.
+     */
     .fields      = (VMStateField[]) {
-        VMSTATE_BOOL(bt.obf_irq_set, ISAIPMIBTDevice),
-        VMSTATE_BOOL(bt.atn_irq_set, ISAIPMIBTDevice),
-        VMSTATE_BOOL(bt.use_irq, ISAIPMIBTDevice),
-        VMSTATE_BOOL(bt.irqs_enabled, ISAIPMIBTDevice),
-        VMSTATE_UINT32(bt.outpos, ISAIPMIBTDevice),
-        VMSTATE_VBUFFER_UINT32(bt.outmsg, ISAIPMIBTDevice, 1, NULL, bt.outlen),
-        VMSTATE_VBUFFER_UINT32(bt.inmsg, ISAIPMIBTDevice, 1, NULL, bt.inlen),
-        VMSTATE_UINT8(bt.control_reg, ISAIPMIBTDevice),
-        VMSTATE_UINT8(bt.mask_reg, ISAIPMIBTDevice),
-        VMSTATE_UINT8(bt.waiting_rsp, ISAIPMIBTDevice),
-        VMSTATE_UINT8(bt.waiting_seq, ISAIPMIBTDevice),
+        VMSTATE_STRUCT(bt, ISAIPMIBTDevice, 1, vmstate_IPMIBT, IPMIBT),
         VMSTATE_END_OF_LIST()
     }
 };
-- 
2.7.4