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Wed, 21 Feb 2024 14:18:39 -0800 (PST) From: nifan.cxl@gmail.com To: qemu-devel@nongnu.org Cc: jonathan.cameron@huawei.com, linux-cxl@vger.kernel.org, gregory.price@memverge.com, ira.weiny@intel.com, dan.j.williams@intel.com, a.manzanares@samsung.com, dave@stgolabs.net, nmtadam.samsung@gmail.com, nifan.cxl@gmail.com, jim.harris@samsung.com, Fan Ni Subject: [PATCH v2] hw/cxl/cxl-mailbox-utils: remove unneeded mailbox output payload space zeroing Date: Wed, 21 Feb 2024 14:18:11 -0800 Message-ID: <20240221221824.1092966-1-nifan.cxl@gmail.com> X-Mailer: git-send-email 2.43.0 MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=2607:f8b0:4864:20::435; envelope-from=nifan.cxl@gmail.com; helo=mail-pf1-x435.google.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @gmail.com) X-ZM-MESSAGEID: 1708553967773100001 Content-Type: text/plain; charset="utf-8" From: Fan Ni 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 --- hw/cxl/cxl-mailbox-utils.c | 7 ------- 1 file changed, 7 deletions(-) diff --git a/hw/cxl/cxl-mailbox-utils.c b/hw/cxl/cxl-mailbox-utils.c index e5eb97cb91..fda88470a3 100644 --- a/hw/cxl/cxl-mailbox-utils.c +++ b/hw/cxl/cxl-mailbox-utils.c @@ -226,7 +226,6 @@ static CXLRetCode cmd_events_get_records(const struct c= xl_cmd *cmd, log_type =3D payload_in[0]; =20 pl =3D (CXLGetEventPayload *)payload_out; - memset(pl, 0, sizeof(*pl)); =20 max_recs =3D (cxlds->payload_size - CXL_EVENT_PAYLOAD_HDR_SIZE) / CXL_EVENT_RECORD_SIZE; @@ -264,7 +263,6 @@ static CXLRetCode cmd_events_get_interrupt_policy(const= struct cxl_cmd *cmd, CXLEventLog *log; =20 policy =3D (CXLEventInterruptPolicy *)payload_out; - memset(policy, 0, sizeof(*policy)); =20 log =3D &cxlds->event_logs[CXL_EVENT_TYPE_INFO]; if (log->irq_enabled) { @@ -363,7 +361,6 @@ static CXLRetCode cmd_infostat_identify(const struct cx= l_cmd *cmd, QEMU_BUILD_BUG_ON(sizeof(*is_identify) !=3D 18); =20 is_identify =3D (void *)payload_out; - memset(is_identify, 0, sizeof(*is_identify)); is_identify->pcie_vid =3D class->vendor_id; is_identify->pcie_did =3D class->device_id; if (object_dynamic_cast(OBJECT(cci->d), TYPE_CXL_USP)) { @@ -597,7 +594,6 @@ static CXLRetCode cmd_infostat_bg_op_sts(const struct c= xl_cmd *cmd, QEMU_BUILD_BUG_ON(sizeof(*bg_op_status) !=3D 8); =20 bg_op_status =3D (void *)payload_out; - memset(bg_op_status, 0, sizeof(*bg_op_status)); bg_op_status->status =3D cci->bg.complete_pct << 1; if (cci->bg.runtime > 0) { bg_op_status->status |=3D 1U << 0; @@ -636,7 +632,6 @@ static CXLRetCode cmd_firmware_update_get_info(const st= ruct cxl_cmd *cmd, } =20 fw_info =3D (void *)payload_out; - memset(fw_info, 0, sizeof(*fw_info)); =20 fw_info->slots_supported =3D 2; fw_info->slot_info =3D BIT(0) | BIT(3); @@ -792,7 +787,6 @@ static CXLRetCode cmd_identify_memory_device(const stru= ct cxl_cmd *cmd, } =20 id =3D (void *)payload_out; - memset(id, 0, sizeof(*id)); =20 snprintf(id->fw_revision, 0x10, "BWFW VERSION %02d", 0); =20 @@ -1079,7 +1073,6 @@ static CXLRetCode cmd_media_get_poison_list(const str= uct cxl_cmd *cmd, out_pl_len =3D sizeof(*out) + record_count * sizeof(out->records[0]); assert(out_pl_len <=3D CXL_MAILBOX_MAX_PAYLOAD_SIZE); =20 - memset(out, 0, out_pl_len); QLIST_FOREACH(ent, poison_list, node) { uint64_t start, stop; =20 --=20 2.43.0