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X-OriginatorOrg: arm.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 01 Sep 2025 18:33:47.3257 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 310b3a09-f07f-434a-1ec8-08dde98616d3 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: DB5PEPF00014B90.eurprd02.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: AM8PR08MB5665 Hi Dave, > > Explicitly initialize the SCTLR2_ELx register before launching > > a new kernel via kexec() to avoid leaving SCTLR2_ELx with an > > arbitrary value when the new kernel runs. > > > > Signed-off-by: Yeoreum Yun > > --- > > arch/arm64/kernel/cpu-reset.S | 4 ++++ > > arch/arm64/kvm/hyp/nvhe/hyp-init.S | 3 +++ > > 2 files changed, 7 insertions(+) > > > > diff --git a/arch/arm64/kernel/cpu-reset.S b/arch/arm64/kernel/cpu-reset.S > > index c87445dde674..c8888891dc8d 100644 > > --- a/arch/arm64/kernel/cpu-reset.S > > +++ b/arch/arm64/kernel/cpu-reset.S > > @@ -37,6 +37,10 @@ SYM_TYPED_FUNC_START(cpu_soft_restart) > > * regime if HCR_EL2.E2H == 1 > > */ > > msr sctlr_el1, x12 > > + > > + mov_q x12, INIT_SCTLR2_EL1 > > + set_sctlr2_elx 1, x12, x8 > > + > > Nit: does it matter whether we reset SCTLR2 before SCTLR? > > I can't find a convincing architectural reason why they need to be > reset in a particular order, but it looks a bit strange that the > cpu_soft_restart and __kvm_handle_stub_hvc versions of this reset the > registers in the opposite order... TBH, I couldn't find the reason why SCTLR2_ELx should be initilized before SCTLR_EL1. I don't think current bits on SCTLR2_ELx doesn't have any effects from SCTLR_EL1 (MMU bit and etc) and vice versa. But as other code, as you mention, it would be better to reorder this initialization. Thanks! [...] -- Sincerely, Yeoreum Yun