Revert "spapr: Fix migration of PCI host bridges from qemu-2.7"

This reverts commit 9b54ca0ba781012eeea4237b7c4832ba2ea81d89.

The commit above corrected a migration breakage between qemu-2.7 and
qemu-2.8.  However it did so by advancing the migration version for
the PCI host bridge, which obviously breaks migration backwards to
earlier qemu versions.

Although it's not totally essential, we'd like to maintain the
possibility for backwards migration, so revert the change in
preparation for a better fix.

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Reviewed-by: Greg Kurz <groug@kaod.org>
Reviewed-by: Alexey Kardashevskiy <aik@ozlabs.ru>

diff --git a/hw/ppc/spapr_pci.c b/hw/ppc/spapr_pci.c
index f9661b7d1a0c2643b35d1db7790a45d99aee1dd4..7cde30ee09fb22b8147b3a54d2431768a267fbd0 100644 (file)
--- a/hw/ppc/spapr_pci.c
+++ b/hw/ppc/spapr_pci.c
@@ -1658,25 +1658,19 @@ static int spapr_pci_post_load(void *opaque, int version_id)
     return 0;
 }
 
-static bool version_before_3(void *opaque, int version_id)
-{
-    return version_id < 3;
-}
-
 static const VMStateDescription vmstate_spapr_pci = {
     .name = "spapr_pci",
-    .version_id = 3,
+    .version_id = 2,
     .minimum_version_id = 2,
     .pre_save = spapr_pci_pre_save,
     .post_load = spapr_pci_post_load,
     .fields = (VMStateField[]) {
         VMSTATE_UINT64_EQUAL(buid, sPAPRPHBState),
-        VMSTATE_UNUSED_TEST(version_before_3,
-                            sizeof(uint32_t) /* dma_liobn[0] */
-                            + sizeof(uint64_t) /* mem_win_addr */
-                            + sizeof(uint64_t) /* mem_win_size */
-                            + sizeof(uint64_t) /* io_win_addr */
-                            + sizeof(uint64_t) /* io_win_size */),
+        VMSTATE_UINT32_EQUAL(dma_liobn[0], sPAPRPHBState),
+        VMSTATE_UINT64_EQUAL(mem_win_addr, sPAPRPHBState),
+        VMSTATE_UINT64_EQUAL(mem_win_size, sPAPRPHBState),
+        VMSTATE_UINT64_EQUAL(io_win_addr, sPAPRPHBState),
+        VMSTATE_UINT64_EQUAL(io_win_size, sPAPRPHBState),
         VMSTATE_STRUCT_ARRAY(lsi_table, sPAPRPHBState, PCI_NUM_PINS, 0,
                              vmstate_spapr_pci_lsi, struct spapr_pci_lsi),
         VMSTATE_INT32(msi_devs_num, sPAPRPHBState),