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X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 06 Jan 2025 12:47:03.1645 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 138d52c6-b09e-4163-d436-08dd2e50384d X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d;Ip=[165.204.84.17];Helo=[SATLEXMB04.amd.com] X-MS-Exchange-CrossTenant-AuthSource: CY4PEPF0000EDD6.namprd03.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: IA0PR12MB8894 Content-Type: text/plain; charset="utf-8" Remove the is_vmpck_empty() helper function, which uses a local array allocation to check if the VMPCK is empty. Replace it with memchr_inv() to directly determine if the VMPCK is empty without additional memory allocation. Suggested-by: Borislav Petkov Signed-off-by: Nikunj A Dadhania Reviewed-by: Tom Lendacky --- drivers/virt/coco/sev-guest/sev-guest.c | 14 ++------------ 1 file changed, 2 insertions(+), 12 deletions(-) diff --git a/drivers/virt/coco/sev-guest/sev-guest.c b/drivers/virt/coco/se= v-guest/sev-guest.c index b699771be029..62328d0b2cb6 100644 --- a/drivers/virt/coco/sev-guest/sev-guest.c +++ b/drivers/virt/coco/sev-guest/sev-guest.c @@ -63,16 +63,6 @@ MODULE_PARM_DESC(vmpck_id, "The VMPCK ID to use when com= municating with the PSP. /* Mutex to serialize the shared buffer access and command handling. */ static DEFINE_MUTEX(snp_cmd_mutex); =20 -static bool is_vmpck_empty(struct snp_msg_desc *mdesc) -{ - char zero_key[VMPCK_KEY_LEN] =3D {0}; - - if (mdesc->vmpck) - return !memcmp(mdesc->vmpck, zero_key, VMPCK_KEY_LEN); - - return true; -} - /* * If an error is received from the host or AMD Secure Processor (ASP) the= re * are two options. Either retry the exact same encrypted request or disco= ntinue @@ -335,7 +325,7 @@ static int snp_send_guest_request(struct snp_msg_desc *= mdesc, struct snp_guest_r guard(mutex)(&snp_cmd_mutex); =20 /* Check if the VMPCK is not empty */ - if (is_vmpck_empty(mdesc)) { + if (!mdesc->vmpck || !memchr_inv(mdesc->vmpck, 0, VMPCK_KEY_LEN)) { pr_err_ratelimited("VMPCK is disabled\n"); return -ENOTTY; } @@ -1024,7 +1014,7 @@ static int __init sev_guest_probe(struct platform_dev= ice *pdev) } =20 /* Verify that VMPCK is not zero. */ - if (is_vmpck_empty(mdesc)) { + if (!memchr_inv(mdesc->vmpck, 0, VMPCK_KEY_LEN)) { dev_err(dev, "Empty VMPCK%d communication key\n", vmpck_id); goto e_unmap; } --=20 2.34.1