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X-OriginatorOrg: arm.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 15 Dec 2025 09:57:14.1265 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 8c8470bf-f51b-4c8d-0434-08de3bc052ce X-MS-Exchange-CrossTenant-Id: f34e5979-57d9-4aaa-ad4d-b122a662184d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=f34e5979-57d9-4aaa-ad4d-b122a662184d;Ip=[4.158.2.129];Helo=[outbound-uk1.az.dlp.m.darktrace.com] X-MS-Exchange-CrossTenant-AuthSource: AM4PEPF00027A5E.eurprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: PA6PR08MB10472 Hi, > On Sun, 14 Dec 2025 11:22:48 +0000, > Yeoreum Yun wrote: > > > > Apply the FEAT_LSUI instruction to emulate the deprecated swpX > > instruction, so that toggling of the PSTATE.PAN bit can be removed when > > LSUI-related instructions are used. > > > > Signed-off-by: Yeoreum Yun > > It really begs the question: what are the odds of ever seeing a CPU > that implements both LSUI and AArch32? > > This seems extremely unlikely to me. Well, I'm not sure how many CPU will have both ID_AA64PFR0_EL1.EL0 bit as 0b0010 and FEAT_LSUI (except FVP currently) -- at least the CPU what I saw, most of them set ID_AA64PFR0_EL1.EL0 as 0b0010. If you this seems useless, I don't have any strong comments whether drop patches related to deprecated swp instruction parts (patch 8-9 only) or not. (But, I hope to pass this decision to maintaining perspective...) > > M. > > -- > Without deviation from the norm, progress is not possible. -- Sincerely, Yeoreum Yun