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X-OriginatorOrg: arm.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 19 Jun 2025 07:40:04.6373 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 1e655c3c-e031-4344-1b9a-08ddaf0481b5 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: DU2PEPF00028D0E.eurprd03.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: AS2PR08MB8717 Hi Marc, > In general, please use a patch title format that matches the one used > for the subsystem. For KVM, that'd be "KVM: arm64: Expose ..."/ > > On Wed, 18 Jun 2025 09:45:06 +0100, > Yeoreum Yun wrote: > > > > expose FEAT_MTE_TAGGED_FAR feature to guest. > > > > Signed-off-by: Yeoreum Yun > > --- > > arch/arm64/kvm/sys_regs.c | 14 ++++++++++---- > > 1 file changed, 10 insertions(+), 4 deletions(-) > > > > diff --git a/arch/arm64/kvm/sys_regs.c b/arch/arm64/kvm/sys_regs.c > > index 76c2f0da821f..c8c92cb9da01 100644 > > --- a/arch/arm64/kvm/sys_regs.c > > +++ b/arch/arm64/kvm/sys_regs.c > > @@ -1586,7 +1586,7 @@ static u64 __kvm_read_sanitised_id_reg(const struct kvm_vcpu *vcpu, > > const struct sys_reg_desc *r) > > { > > u32 id = reg_to_encoding(r); > > - u64 val; > > + u64 val, mask; > > > > if (sysreg_visible_as_raz(vcpu, r)) > > return 0; > > @@ -1617,8 +1617,12 @@ static u64 __kvm_read_sanitised_id_reg(const struct kvm_vcpu *vcpu, > > val &= ~ARM64_FEATURE_MASK(ID_AA64PFR1_EL1_MPAM_frac); > > break; > > case SYS_ID_AA64PFR2_EL1: > > - /* We only expose FPMR */ > > - val &= ID_AA64PFR2_EL1_FPMR; > > + mask = ID_AA64PFR2_EL1_FPMR; > > + > > + if (kvm_has_mte(vcpu->kvm)) > > + mask |= ID_AA64PFR2_EL1_MTEFAR; > > + > > + val &= mask; > > I don't think there is a need for an extra variable, and you could > follow the pattern established in this file by writing this as: > > val &= (ID_AA64PFR2_EL1_FPMR | > (kvm_has_mte(vcpu->kvm) ? ID_AA64PFR2_EL1_MTEFAR : 0)); > > Not a big deal though. Thanks for your suggestion. I'll apply this with STORE_ONLY patch too in end of this day. -- Sincerely, Yeoreum Yun