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X-OriginatorOrg: arm.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 01 Sep 2025 18:18:37.3397 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 7b1cd55a-9e5d-4e67-5115-08dde983f86d 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: DU2PEPF0001E9C2.eurprd03.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DU0PR08MB8662 Hi Dave, > On Thu, Aug 21, 2025 at 06:24:03PM +0100, Yeoreum Yun wrote: > > This series introduces initial support for the SCTLR2_ELx registers in Linux. > > The feature is optional starting from ARMv8.8/ARMv9.3, > > and becomes mandatory from ARMv8.9/ARMv9.4. > > > > Currently, Linux has no strict need to modify SCTLR2_ELx-- > > at least assuming that firmware initializes > > these registers to reasonable defaults. > > > > However, several upcoming architectural features will require configuring > > control bits in these registers. > > Notable examples include FEAT_PAuth_LR and FEAT_CPA2. > > This looks OK to me now, except for one or two minor issues (see > replies to the patches). > > I think we will need a way of testing all the code paths before this > should be merged, though. > > Have you tested all the code paths, or are there some things that have > not been tested? I've tested for pKVM, nested and nhve and crash path (I do my best what can I do for modified path). > > > Since this code is not useful by itself, it may make sense to delay > merging it until we have patches for a feature that depends on SCTLR2. Whatever I pass this detiermination for maintainer. > > Cheers > ---Dave -- Sincerely, Yeoreum Yun