The member VMStateField.start was solely used to implement the partial
data migration for VBUFFER data (basically provide migration for a
sub-buffer). However the implementation of this feature seems broken to
me, but this goes unnoticed since the feature is not used at all.
Instead of fixing it lets try simplify things by dropping it.

Signed-off-by: Halil Pasic <pa...@linux.vnet.ibm.com>
Reviewed-by: Guenther Hutzl <hu...@linux.vnet.ibm.com>
---
 hw/char/exynos4210_uart.c   |  2 +-
 hw/display/g364fb.c         |  2 +-
 hw/dma/pl330.c              |  8 ++++----
 hw/intc/exynos4210_gic.c    |  2 +-
 hw/ipmi/isa_ipmi_bt.c       |  4 ++--
 hw/ipmi/isa_ipmi_kcs.c      |  4 ++--
 hw/net/vmxnet3.c            |  2 +-
 hw/nvram/mac_nvram.c        |  2 +-
 hw/nvram/spapr_nvram.c      |  2 +-
 hw/sd/sdhci.c               |  2 +-
 hw/timer/m48t59.c           |  2 +-
 include/migration/vmstate.h | 20 ++++++--------------
 migration/savevm.c          |  2 +-
 migration/vmstate.c         |  4 ++--
 target-s390x/machine.c      |  2 +-
 tests/test-vmstate.c        |  4 ++--
 util/fifo8.c                |  2 +-
 17 files changed, 29 insertions(+), 37 deletions(-)

diff --git a/hw/char/exynos4210_uart.c b/hw/char/exynos4210_uart.c
index 1107578..7b1b4b1 100644
--- a/hw/char/exynos4210_uart.c
+++ b/hw/char/exynos4210_uart.c
@@ -565,7 +565,7 @@ static const VMStateDescription 
vmstate_exynos4210_uart_fifo = {
     .fields = (VMStateField[]) {
         VMSTATE_UINT32(sp, Exynos4210UartFIFO),
         VMSTATE_UINT32(rp, Exynos4210UartFIFO),
-        VMSTATE_VBUFFER_UINT32(data, Exynos4210UartFIFO, 1, NULL, 0, size),
+        VMSTATE_VBUFFER_UINT32(data, Exynos4210UartFIFO, 1, NULL, size),
         VMSTATE_END_OF_LIST()
     }
 };
diff --git a/hw/display/g364fb.c b/hw/display/g364fb.c
index 70ef2c7..8cdc205 100644
--- a/hw/display/g364fb.c
+++ b/hw/display/g364fb.c
@@ -464,7 +464,7 @@ static const VMStateDescription vmstate_g364fb = {
     .minimum_version_id = 1,
     .post_load = g364fb_post_load,
     .fields = (VMStateField[]) {
-        VMSTATE_VBUFFER_UINT32(vram, G364State, 1, NULL, 0, vram_size),
+        VMSTATE_VBUFFER_UINT32(vram, G364State, 1, NULL, vram_size),
         VMSTATE_BUFFER_UNSAFE(color_palette, G364State, 0, 256 * 3),
         VMSTATE_BUFFER_UNSAFE(cursor_palette, G364State, 0, 9),
         VMSTATE_UINT16_ARRAY(cursor, G364State, 512),
diff --git a/hw/dma/pl330.c b/hw/dma/pl330.c
index c0bd9fe..32cf839 100644
--- a/hw/dma/pl330.c
+++ b/hw/dma/pl330.c
@@ -173,8 +173,8 @@ static const VMStateDescription vmstate_pl330_fifo = {
     .version_id = 1,
     .minimum_version_id = 1,
     .fields = (VMStateField[]) {
-        VMSTATE_VBUFFER_UINT32(buf, PL330Fifo, 1, NULL, 0, buf_size),
-        VMSTATE_VBUFFER_UINT32(tag, PL330Fifo, 1, NULL, 0, buf_size),
+        VMSTATE_VBUFFER_UINT32(buf, PL330Fifo, 1, NULL, buf_size),
+        VMSTATE_VBUFFER_UINT32(tag, PL330Fifo, 1, NULL, buf_size),
         VMSTATE_UINT32(head, PL330Fifo),
         VMSTATE_UINT32(num, PL330Fifo),
         VMSTATE_UINT32(buf_size, PL330Fifo),
@@ -282,8 +282,8 @@ static const VMStateDescription vmstate_pl330 = {
         VMSTATE_STRUCT(manager, PL330State, 0, vmstate_pl330_chan, PL330Chan),
         VMSTATE_STRUCT_VARRAY_UINT32(chan, PL330State, num_chnls, 0,
                                      vmstate_pl330_chan, PL330Chan),
-        VMSTATE_VBUFFER_UINT32(lo_seqn, PL330State, 1, NULL, 0, num_chnls),
-        VMSTATE_VBUFFER_UINT32(hi_seqn, PL330State, 1, NULL, 0, num_chnls),
+        VMSTATE_VBUFFER_UINT32(lo_seqn, PL330State, 1, NULL, num_chnls),
+        VMSTATE_VBUFFER_UINT32(hi_seqn, PL330State, 1, NULL, num_chnls),
         VMSTATE_STRUCT(fifo, PL330State, 0, vmstate_pl330_fifo, PL330Fifo),
         VMSTATE_STRUCT(read_queue, PL330State, 0, vmstate_pl330_queue,
                        PL330Queue),
diff --git a/hw/intc/exynos4210_gic.c b/hw/intc/exynos4210_gic.c
index fd7a8f3..2a55817 100644
--- a/hw/intc/exynos4210_gic.c
+++ b/hw/intc/exynos4210_gic.c
@@ -393,7 +393,7 @@ static const VMStateDescription vmstate_exynos4210_irq_gate 
= {
     .version_id = 2,
     .minimum_version_id = 2,
     .fields = (VMStateField[]) {
-        VMSTATE_VBUFFER_UINT32(level, Exynos4210IRQGateState, 1, NULL, 0, 
n_in),
+        VMSTATE_VBUFFER_UINT32(level, Exynos4210IRQGateState, 1, NULL, n_in),
         VMSTATE_END_OF_LIST()
     }
 };
diff --git a/hw/ipmi/isa_ipmi_bt.c b/hw/ipmi/isa_ipmi_bt.c
index f036617..6c10ef7 100644
--- a/hw/ipmi/isa_ipmi_bt.c
+++ b/hw/ipmi/isa_ipmi_bt.c
@@ -471,9 +471,9 @@ static const VMStateDescription vmstate_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, 0,
+        VMSTATE_VBUFFER_UINT32(bt.outmsg, ISAIPMIBTDevice, 1, NULL,
                                bt.outlen),
-        VMSTATE_VBUFFER_UINT32(bt.inmsg, ISAIPMIBTDevice, 1, NULL, 0,
+        VMSTATE_VBUFFER_UINT32(bt.inmsg, ISAIPMIBTDevice, 1, NULL,
                                bt.inlen),
         VMSTATE_UINT8(bt.control_reg, ISAIPMIBTDevice),
         VMSTATE_UINT8(bt.mask_reg, ISAIPMIBTDevice),
diff --git a/hw/ipmi/isa_ipmi_kcs.c b/hw/ipmi/isa_ipmi_kcs.c
index 9a38f8a..b592d53 100644
--- a/hw/ipmi/isa_ipmi_kcs.c
+++ b/hw/ipmi/isa_ipmi_kcs.c
@@ -433,9 +433,9 @@ const VMStateDescription vmstate_ISAIPMIKCSDevice = {
         VMSTATE_BOOL(kcs.use_irq, ISAIPMIKCSDevice),
         VMSTATE_BOOL(kcs.irqs_enabled, ISAIPMIKCSDevice),
         VMSTATE_UINT32(kcs.outpos, ISAIPMIKCSDevice),
-        VMSTATE_VBUFFER_UINT32(kcs.outmsg, ISAIPMIKCSDevice, 1, NULL, 0,
+        VMSTATE_VBUFFER_UINT32(kcs.outmsg, ISAIPMIKCSDevice, 1, NULL,
                                kcs.outlen),
-        VMSTATE_VBUFFER_UINT32(kcs.inmsg, ISAIPMIKCSDevice, 1, NULL, 0,
+        VMSTATE_VBUFFER_UINT32(kcs.inmsg, ISAIPMIKCSDevice, 1, NULL,
                                kcs.inlen),
         VMSTATE_BOOL(kcs.write_end, ISAIPMIKCSDevice),
         VMSTATE_UINT8(kcs.status_reg, ISAIPMIKCSDevice),
diff --git a/hw/net/vmxnet3.c b/hw/net/vmxnet3.c
index 90f6943..b4b71f3 100644
--- a/hw/net/vmxnet3.c
+++ b/hw/net/vmxnet3.c
@@ -2396,7 +2396,7 @@ static const VMStateDescription 
vmxstate_vmxnet3_mcast_list = {
     .pre_load = vmxnet3_mcast_list_pre_load,
     .needed = vmxnet3_mc_list_needed,
     .fields = (VMStateField[]) {
-        VMSTATE_VBUFFER_UINT32(mcast_list, VMXNET3State, 0, NULL, 0,
+        VMSTATE_VBUFFER_UINT32(mcast_list, VMXNET3State, 0, NULL,
             mcast_list_buff_size),
         VMSTATE_END_OF_LIST()
     }
diff --git a/hw/nvram/mac_nvram.c b/hw/nvram/mac_nvram.c
index 24f6121..09676e2 100644
--- a/hw/nvram/mac_nvram.c
+++ b/hw/nvram/mac_nvram.c
@@ -83,7 +83,7 @@ static const VMStateDescription vmstate_macio_nvram = {
     .version_id = 1,
     .minimum_version_id = 1,
     .fields = (VMStateField[]) {
-        VMSTATE_VBUFFER_UINT32(data, MacIONVRAMState, 0, NULL, 0, size),
+        VMSTATE_VBUFFER_UINT32(data, MacIONVRAMState, 0, NULL, size),
         VMSTATE_END_OF_LIST()
     }
 };
diff --git a/hw/nvram/spapr_nvram.c b/hw/nvram/spapr_nvram.c
index 4de5f70..ccef3f9 100644
--- a/hw/nvram/spapr_nvram.c
+++ b/hw/nvram/spapr_nvram.c
@@ -218,7 +218,7 @@ static const VMStateDescription vmstate_spapr_nvram = {
     .post_load = spapr_nvram_post_load,
     .fields = (VMStateField[]) {
         VMSTATE_UINT32(size, sPAPRNVRAM),
-        VMSTATE_VBUFFER_ALLOC_UINT32(buf, sPAPRNVRAM, 1, NULL, 0, size),
+        VMSTATE_VBUFFER_ALLOC_UINT32(buf, sPAPRNVRAM, 1, NULL, size),
         VMSTATE_END_OF_LIST()
     },
 };
diff --git a/hw/sd/sdhci.c b/hw/sd/sdhci.c
index 01fbf22..c0d7de7 100644
--- a/hw/sd/sdhci.c
+++ b/hw/sd/sdhci.c
@@ -1253,7 +1253,7 @@ const VMStateDescription sdhci_vmstate = {
         VMSTATE_UINT16(data_count, SDHCIState),
         VMSTATE_UINT64(admasysaddr, SDHCIState),
         VMSTATE_UINT8(stopped_state, SDHCIState),
-        VMSTATE_VBUFFER_UINT32(fifo_buffer, SDHCIState, 1, NULL, 0, buf_maxsz),
+        VMSTATE_VBUFFER_UINT32(fifo_buffer, SDHCIState, 1, NULL, buf_maxsz),
         VMSTATE_TIMER_PTR(insert_timer, SDHCIState),
         VMSTATE_TIMER_PTR(transfer_timer, SDHCIState),
         VMSTATE_END_OF_LIST()
diff --git a/hw/timer/m48t59.c b/hw/timer/m48t59.c
index e46ca88..40a9e18 100644
--- a/hw/timer/m48t59.c
+++ b/hw/timer/m48t59.c
@@ -634,7 +634,7 @@ static const VMStateDescription vmstate_m48t59 = {
     .fields = (VMStateField[]) {
         VMSTATE_UINT8(lock, M48t59State),
         VMSTATE_UINT16(addr, M48t59State),
-        VMSTATE_VBUFFER_UINT32(buffer, M48t59State, 0, NULL, 0, size),
+        VMSTATE_VBUFFER_UINT32(buffer, M48t59State, 0, NULL, size),
         VMSTATE_END_OF_LIST()
     }
 };
diff --git a/include/migration/vmstate.h b/include/migration/vmstate.h
index 1638ee5..26527ad 100644
--- a/include/migration/vmstate.h
+++ b/include/migration/vmstate.h
@@ -190,7 +190,6 @@ typedef struct {
     const char *name;
     size_t offset;
     size_t size;
-    size_t start;
     int num;
     size_t num_offset;
     size_t size_offset;
@@ -570,7 +569,7 @@ extern const VMStateInfo vmstate_info_bitmap;
     .offset       = vmstate_offset_buffer(_state, _field) + _start,  \
 }
 
-#define VMSTATE_VBUFFER_MULTIPLY(_field, _state, _version, _test, _start, 
_field_size, _multiply) { \
+#define VMSTATE_VBUFFER_MULTIPLY(_field, _state, _version, _test, _field_size, 
_multiply) { \
     .name         = (stringify(_field)),                             \
     .version_id   = (_version),                                      \
     .field_exists = (_test),                                         \
@@ -579,10 +578,9 @@ extern const VMStateInfo vmstate_info_bitmap;
     .info         = &vmstate_info_buffer,                            \
     .flags        = VMS_VBUFFER|VMS_POINTER|VMS_MULTIPLY,            \
     .offset       = offsetof(_state, _field),                        \
-    .start        = (_start),                                        \
 }
 
-#define VMSTATE_VBUFFER(_field, _state, _version, _test, _start, _field_size) 
{ \
+#define VMSTATE_VBUFFER(_field, _state, _version, _test, _field_size) { \
     .name         = (stringify(_field)),                             \
     .version_id   = (_version),                                      \
     .field_exists = (_test),                                         \
@@ -590,10 +588,9 @@ extern const VMStateInfo vmstate_info_bitmap;
     .info         = &vmstate_info_buffer,                            \
     .flags        = VMS_VBUFFER|VMS_POINTER,                         \
     .offset       = offsetof(_state, _field),                        \
-    .start        = (_start),                                        \
 }
 
-#define VMSTATE_VBUFFER_UINT32(_field, _state, _version, _test, _start, 
_field_size) { \
+#define VMSTATE_VBUFFER_UINT32(_field, _state, _version, _test, _field_size) { 
\
     .name         = (stringify(_field)),                             \
     .version_id   = (_version),                                      \
     .field_exists = (_test),                                         \
@@ -601,10 +598,9 @@ extern const VMStateInfo vmstate_info_bitmap;
     .info         = &vmstate_info_buffer,                            \
     .flags        = VMS_VBUFFER|VMS_POINTER,                         \
     .offset       = offsetof(_state, _field),                        \
-    .start        = (_start),                                        \
 }
 
-#define VMSTATE_VBUFFER_ALLOC_UINT32(_field, _state, _version, _test, _start, 
_field_size) { \
+#define VMSTATE_VBUFFER_ALLOC_UINT32(_field, _state, _version, _test, 
_field_size) { \
     .name         = (stringify(_field)),                             \
     .version_id   = (_version),                                      \
     .field_exists = (_test),                                         \
@@ -612,7 +608,6 @@ extern const VMStateInfo vmstate_info_bitmap;
     .info         = &vmstate_info_buffer,                            \
     .flags        = VMS_VBUFFER|VMS_POINTER|VMS_ALLOC,               \
     .offset       = offsetof(_state, _field),                        \
-    .start        = (_start),                                        \
 }
 
 #define VMSTATE_BUFFER_UNSAFE_INFO_TEST(_field, _state, _test, _version, 
_info, _size) { \
@@ -912,13 +907,10 @@ extern const VMStateInfo vmstate_info_bitmap;
     VMSTATE_BUFFER_START_MIDDLE_V(_f, _s, _start, 0)
 
 #define VMSTATE_PARTIAL_VBUFFER(_f, _s, _size)                        \
-    VMSTATE_VBUFFER(_f, _s, 0, NULL, 0, _size)
+    VMSTATE_VBUFFER(_f, _s, 0, NULL, _size)
 
 #define VMSTATE_PARTIAL_VBUFFER_UINT32(_f, _s, _size)                        \
-    VMSTATE_VBUFFER_UINT32(_f, _s, 0, NULL, 0, _size)
-
-#define VMSTATE_SUB_VBUFFER(_f, _s, _start, _size)                    \
-    VMSTATE_VBUFFER(_f, _s, 0, NULL, _start, _size)
+    VMSTATE_VBUFFER_UINT32(_f, _s, 0, NULL, _size)
 
 #define VMSTATE_BUFFER_TEST(_f, _s, _test)                            \
     VMSTATE_STATIC_BUFFER(_f, _s, 0, _test, 0, sizeof(typeof_field(_s, _f)))
diff --git a/migration/savevm.c b/migration/savevm.c
index 33a2911..1df5c76 100644
--- a/migration/savevm.c
+++ b/migration/savevm.c
@@ -308,7 +308,7 @@ static const VMStateDescription vmstate_configuration = {
     .pre_save = configuration_pre_save,
     .fields = (VMStateField[]) {
         VMSTATE_UINT32(len, SaveState),
-        VMSTATE_VBUFFER_ALLOC_UINT32(name, SaveState, 0, NULL, 0, len),
+        VMSTATE_VBUFFER_ALLOC_UINT32(name, SaveState, 0, NULL, len),
         VMSTATE_END_OF_LIST()
     },
 };
diff --git a/migration/vmstate.c b/migration/vmstate.c
index fc29acf..8767e40 100644
--- a/migration/vmstate.c
+++ b/migration/vmstate.c
@@ -66,10 +66,10 @@ static void *vmstate_base_addr(void *opaque, VMStateField 
*field, bool alloc)
                 }
             }
             if (size) {
-                *((void **)base_addr + field->start) = g_malloc(size);
+                *(void **)base_addr = g_malloc(size);
             }
         }
-        base_addr = *(void **)base_addr + field->start;
+        base_addr = *(void **)base_addr;
     }
 
     return base_addr;
diff --git a/target-s390x/machine.c b/target-s390x/machine.c
index edc3a47..8503fa1 100644
--- a/target-s390x/machine.c
+++ b/target-s390x/machine.c
@@ -180,7 +180,7 @@ const VMStateDescription vmstate_s390_cpu = {
         VMSTATE_UINT8(env.cpu_state, S390CPU),
         VMSTATE_UINT8(env.sigp_order, S390CPU),
         VMSTATE_UINT32_V(irqstate_saved_size, S390CPU, 4),
-        VMSTATE_VBUFFER_UINT32(irqstate, S390CPU, 4, NULL, 0,
+        VMSTATE_VBUFFER_UINT32(irqstate, S390CPU, 4, NULL,
                                irqstate_saved_size),
         VMSTATE_END_OF_LIST()
     },
diff --git a/tests/test-vmstate.c b/tests/test-vmstate.c
index 4ea64b7..aaa7143 100644
--- a/tests/test-vmstate.c
+++ b/tests/test-vmstate.c
@@ -506,9 +506,9 @@ static const VMStateDescription vmstate_vbuffer = {
     .minimum_version_id = 1,
     .fields = (VMStateField[]) {
         VMSTATE_UINT8(u8_1, TestVBuffer),
-        VMSTATE_VBUFFER(vBuffer_1, TestVBuffer, 1, NULL, 0,
+        VMSTATE_VBUFFER(vBuffer_1, TestVBuffer, 1, NULL,
                         buffer_size),
-        VMSTATE_VBUFFER_ALLOC_UINT32(vBuffer_alloc_1, TestVBuffer, 1, NULL, 0,
+        VMSTATE_VBUFFER_ALLOC_UINT32(vBuffer_alloc_1, TestVBuffer, 1, NULL,
                         buffer_alloc_size),
         VMSTATE_UINT8(u8_2, TestVBuffer),
         VMSTATE_END_OF_LIST()
diff --git a/util/fifo8.c b/util/fifo8.c
index 5c64101..d38b3bd 100644
--- a/util/fifo8.c
+++ b/util/fifo8.c
@@ -118,7 +118,7 @@ const VMStateDescription vmstate_fifo8 = {
     .version_id = 1,
     .minimum_version_id = 1,
     .fields = (VMStateField[]) {
-        VMSTATE_VBUFFER_UINT32(data, Fifo8, 1, NULL, 0, capacity),
+        VMSTATE_VBUFFER_UINT32(data, Fifo8, 1, NULL, capacity),
         VMSTATE_UINT32(head, Fifo8),
         VMSTATE_UINT32(num, Fifo8),
         VMSTATE_END_OF_LIST()
-- 
2.8.4


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