[PULL,v2,03/61] hw/cxl/cxl-mailbox-utils: remove unneeded mailbox output payload space zeroing

Commit Message

Michael S. Tsirkin July 23, 2024, 10:55 a.m. UTC

From: Fan Ni <[e-mail]>

The whole mailbox output payload space is already zeroed after copying
out the input payload, which happens before processing the specific mailbox
command:
https://elixir.bootlin.com/qemu/v8.2.1/source/hw/cxl/cxl-device-utils.c#L204

Signed-off-by: Fan Ni <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Jonathan Cameron <[e-mail]>
Message-Id: <[e-mail]>
Reviewed-by: Michael S. Tsirkin <[e-mail]>
Signed-off-by: Michael S. Tsirkin <[e-mail]>
---
 hw/cxl/cxl-mailbox-utils.c | 7 -------
 1 file changed, 7 deletions(-)

Patch

diff --git a/hw/cxl/cxl-mailbox-utils.c b/hw/cxl/cxl-mailbox-utils.c
index 74eeb6fde7..facec42dc8 100644
--- a/hw/cxl/cxl-mailbox-utils.c
+++ b/hw/cxl/cxl-mailbox-utils.c
@@ -235,7 +235,6 @@  static CXLRetCode cmd_events_get_records(const struct cxl_cmd *cmd,
     log_type = payload_in[0];
 
     pl = (CXLGetEventPayload *)payload_out;
-    memset(pl, 0, sizeof(*pl));
 
     max_recs = (cxlds->payload_size - CXL_EVENT_PAYLOAD_HDR_SIZE) /
                 CXL_EVENT_RECORD_SIZE;
@@ -273,7 +272,6 @@  static CXLRetCode cmd_events_get_interrupt_policy(const struct cxl_cmd *cmd,
     CXLEventLog *log;
 
     policy = (CXLEventInterruptPolicy *)payload_out;
-    memset(policy, 0, sizeof(*policy));
 
     log = &cxlds->event_logs[CXL_EVENT_TYPE_INFO];
     if (log->irq_enabled) {
@@ -372,7 +370,6 @@  static CXLRetCode cmd_infostat_identify(const struct cxl_cmd *cmd,
     QEMU_BUILD_BUG_ON(sizeof(*is_identify) != 18);
 
     is_identify = (void *)payload_out;
-    memset(is_identify, 0, sizeof(*is_identify));
     is_identify->pcie_vid = class->vendor_id;
     is_identify->pcie_did = class->device_id;
     if (object_dynamic_cast(OBJECT(cci->d), TYPE_CXL_USP)) {
@@ -606,7 +603,6 @@  static CXLRetCode cmd_infostat_bg_op_sts(const struct cxl_cmd *cmd,
     QEMU_BUILD_BUG_ON(sizeof(*bg_op_status) != 8);
 
     bg_op_status = (void *)payload_out;
-    memset(bg_op_status, 0, sizeof(*bg_op_status));
     bg_op_status->status = cci->bg.complete_pct << 1;
     if (cci->bg.runtime > 0) {
         bg_op_status->status |= 1U << 0;
@@ -647,7 +643,6 @@  static CXLRetCode cmd_firmware_update_get_info(const struct cxl_cmd *cmd,
     }
 
     fw_info = (void *)payload_out;
-    memset(fw_info, 0, sizeof(*fw_info));
 
     fw_info->slots_supported = 2;
     fw_info->slot_info = BIT(0) | BIT(3);
@@ -805,7 +800,6 @@  static CXLRetCode cmd_identify_memory_device(const struct cxl_cmd *cmd,
     }
 
     id = (void *)payload_out;
-    memset(id, 0, sizeof(*id));
 
     snprintf(id->fw_revision, 0x10, "BWFW VERSION %02d", 0);
 
@@ -1095,7 +1089,6 @@  static CXLRetCode cmd_media_get_poison_list(const struct cxl_cmd *cmd,
     out_pl_len = sizeof(*out) + record_count * sizeof(out->records[0]);
     assert(out_pl_len <= CXL_MAILBOX_MAX_PAYLOAD_SIZE);
 
-    memset(out, 0, out_pl_len);
     QLIST_FOREACH(ent, poison_list, node) {
         uint64_t start, stop;