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X-OriginatorOrg: arm.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 11 Jun 2025 17:56:16.8441 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 44c61caa-cd98-48d7-15d7-08dda911438f 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: DB1PEPF000509EF.eurprd03.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: VE1PR08MB5757 Hi Marc, > On Wed, 11 Jun 2025 11:49:11 +0100, > Yeoreum Yun wrote: > > > > Since Armv9.6, FEAT_LSUI supplies load/store instructions > > for privileged level to access user memory without clearing PSTATE.PAN bit. > > > > Add LSUI feature so that the unprevilieged load/store instrcutions > > nit: instructions Thanks. > > could be used when kernel accesses user memory without clearing PSTATE.PAN bit. > > > > Signed-off-by: Yeoreum Yun > > --- > > arch/arm64/kernel/cpufeature.c | 8 ++++++++ > > arch/arm64/tools/cpucaps | 1 + > > 2 files changed, 9 insertions(+) > > > > diff --git a/arch/arm64/kernel/cpufeature.c b/arch/arm64/kernel/cpufeature.c > > index b34044e20128..d914982c7cee 100644 > > --- a/arch/arm64/kernel/cpufeature.c > > +++ b/arch/arm64/kernel/cpufeature.c > > @@ -278,6 +278,7 @@ static const struct arm64_ftr_bits ftr_id_aa64isar2[] = { > > > > static const struct arm64_ftr_bits ftr_id_aa64isar3[] = { > > ARM64_FTR_BITS(FTR_VISIBLE, FTR_NONSTRICT, FTR_LOWER_SAFE, ID_AA64ISAR3_EL1_FPRCVT_SHIFT, 4, 0), > > + ARM64_FTR_BITS(FTR_HIDDEN, FTR_NONSTRICT, FTR_LOWER_SAFE, ID_AA64ISAR3_EL1_LSUI_SHIFT, 4, ID_AA64ISAR3_EL1_LSUI_NI), > > ARM64_FTR_BITS(FTR_VISIBLE, FTR_NONSTRICT, FTR_LOWER_SAFE, ID_AA64ISAR3_EL1_FAMINMAX_SHIFT, 4, 0), > > ARM64_FTR_END, > > }; > > Please enable the equivalent bits in KVM so that the feature can be > exposed to a guest. Okay. I'll add in next round. Thanks! -- Sincerely, Yeoreum Yun