linux-kernel - [tip: x86/sev] x86/sev: Allocate request in TSC_INFO

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Message-ID: <175032959912.406.12738123807711242663.tip-bot2@tip-bot2>
Date: Thu, 19 Jun 2025 10:39:59 -0000
From: "tip-bot2 for Alexey Kardashevskiy" <tip-bot2@...utronix.de>
To: linux-tip-commits@...r.kernel.org
Cc: Alexey Kardashevskiy <aik@....com>, "Borislav Petkov (AMD)" <bp@...en8.de>,
 Tom Lendacky <thomas.lendacky@....com>, Dionna Glaze <dionnaglaze@...gle.com>,
 x86@...nel.org, linux-kernel@...r.kernel.org
Subject: [tip: x86/sev] x86/sev: Allocate request in TSC_INFO_REQ on stack

The following commit has been merged into the x86/sev branch of tip:

Commit-ID:     d100016eac21636c8c0507a83bc32d9eb8cd56ab
Gitweb:        https://git.kernel.org/tip/d100016eac21636c8c0507a83bc32d9eb8cd56ab
Author:        Alexey Kardashevskiy <aik@....com>
AuthorDate:    Wed, 11 Jun 2025 14:08:40 +10:00
Committer:     Borislav Petkov (AMD) <bp@...en8.de>
CommitterDate: Wed, 18 Jun 2025 22:55:39 +02:00

x86/sev: Allocate request in TSC_INFO_REQ on stack

Allocate a 88 byte request structure on stack and skip needless
kzalloc/kfree.

While at this, correct indent.

No functional change intended.

Signed-off-by: Alexey Kardashevskiy <aik@....com>
Signed-off-by: Borislav Petkov (AMD) <bp@...en8.de>
Reviewed-by: Tom Lendacky <thomas.lendacky@....com>
Reviewed-by: Dionna Glaze <dionnaglaze@...gle.com>
Link: https://lore.kernel.org/20250611040842.2667262-3-aik@amd.com
---
 arch/x86/coco/sev/core.c | 30 ++++++++++++------------------
 1 file changed, 12 insertions(+), 18 deletions(-)

diff --git a/arch/x86/coco/sev/core.c b/arch/x86/coco/sev/core.c
index cf91cb4..0686538 100644
--- a/arch/x86/coco/sev/core.c
+++ b/arch/x86/coco/sev/core.c
@@ -2069,7 +2069,7 @@ static int __init snp_get_tsc_info(void)
 	struct snp_tsc_info_resp *tsc_resp;
 	struct snp_tsc_info_req *tsc_req;
 	struct snp_msg_desc *mdesc;
-	struct snp_guest_req *req;
+	struct snp_guest_req req = {};
 	int rc = -ENOMEM;
 
 	tsc_req = kzalloc(sizeof(*tsc_req), GFP_KERNEL);
@@ -2085,28 +2085,24 @@ static int __init snp_get_tsc_info(void)
 	if (!tsc_resp)
 		goto e_free_tsc_req;
 
-	req = kzalloc(sizeof(*req), GFP_KERNEL);
-	if (!req)
-		goto e_free_tsc_resp;
-
 	mdesc = snp_msg_alloc();
 	if (IS_ERR_OR_NULL(mdesc))
-		goto e_free_req;
+		goto e_free_tsc_resp;
 
 	rc = snp_msg_init(mdesc, snp_vmpl);
 	if (rc)
 		goto e_free_mdesc;
 
-	req->msg_version = MSG_HDR_VER;
-	req->msg_type = SNP_MSG_TSC_INFO_REQ;
-	req->vmpck_id = snp_vmpl;
-	req->req_buf = tsc_req;
-	req->req_sz = sizeof(*tsc_req);
-	req->resp_buf = (void *)tsc_resp;
-	req->resp_sz = sizeof(*tsc_resp) + AUTHTAG_LEN;
-	req->exit_code = SVM_VMGEXIT_GUEST_REQUEST;
+	req.msg_version = MSG_HDR_VER;
+	req.msg_type = SNP_MSG_TSC_INFO_REQ;
+	req.vmpck_id = snp_vmpl;
+	req.req_buf = tsc_req;
+	req.req_sz = sizeof(*tsc_req);
+	req.resp_buf = (void *)tsc_resp;
+	req.resp_sz = sizeof(*tsc_resp) + AUTHTAG_LEN;
+	req.exit_code = SVM_VMGEXIT_GUEST_REQUEST;
 
-	rc = snp_send_guest_request(mdesc, req);
+	rc = snp_send_guest_request(mdesc, &req);
 	if (rc)
 		goto e_request;
 
@@ -2127,9 +2123,7 @@ e_request:
 	memzero_explicit(tsc_resp, sizeof(*tsc_resp) + AUTHTAG_LEN);
 e_free_mdesc:
 	snp_msg_free(mdesc);
-e_free_req:
-	kfree(req);
- e_free_tsc_resp:
+e_free_tsc_resp:
 	kfree(tsc_resp);
 e_free_tsc_req:
 	kfree(tsc_req);