hw/cxl/mbox: Split mailbox command payload into separate input and output

New CCI types that will be supported shortly do not have a single buffer
used in both directions. As such, split it up. To avoid the complexities
of implementing all commands to handle potential aliasing, take a copy of
the input before use.

Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

Message-Id: <20231023160806.13206-3-Jonathan.Cameron@huawei.com>
Reviewed-by: Fan Ni <fan.ni@samsung.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

1 files changed, 4 insertions, 3 deletions

diff --git a/include/hw/cxl/cxl_device.h b/include/hw/cxl/cxl_device.h
index 556953469c..d7a2c4009e 100644
--- a/include/hw/cxl/cxl_device.h
+++ b/include/hw/cxl/cxl_device.h
@@ -114,8 +114,9 @@ typedef enum {
 typedef struct cxl_device_state CXLDeviceState;
 struct cxl_cmd;
 typedef CXLRetCode (*opcode_handler)(const struct cxl_cmd *cmd,
-                                     uint8_t *payload,
-                                     CXLDeviceState *cxl_dstate, uint16_t *len);
+                                     uint8_t *payload_in, size_t len_in,
+                                     uint8_t *payload_out, size_t *len_out,
+                                     CXLDeviceState *cxl_dstate);
 struct cxl_cmd {
     const char *name;
     opcode_handler handler;
@@ -390,7 +391,7 @@ bool cxl_event_insert(CXLDeviceState *cxlds, CXLEventLogType log_type,
                       CXLEventRecordRaw *event);
 CXLRetCode cxl_event_get_records(CXLDeviceState *cxlds, CXLGetEventPayload *pl,
                                  uint8_t log_type, int max_recs,
-                                 uint16_t *len);
+                                 size_t *len);
 CXLRetCode cxl_event_clear_records(CXLDeviceState *cxlds,
                                    CXLClearEventPayload *pl);