Add feature_config_ctrl for MTE, which is indicated in ID_AA64PFR1_EL1, to program configuration register to trap the guest's using the feature when it is not exposed to the guest. Signed-off-by: Reiji Watanabe <reijiw@xxxxxxxxxx> --- arch/arm64/kvm/sys_regs.c | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+) diff --git a/arch/arm64/kvm/sys_regs.c b/arch/arm64/kvm/sys_regs.c index 3f3f2800ff8b..924ffedf4b05 100644 --- a/arch/arm64/kvm/sys_regs.c +++ b/arch/arm64/kvm/sys_regs.c @@ -345,6 +345,11 @@ static void feature_amu_trap_activate(struct kvm_vcpu *vcpu) feature_trap_activate(vcpu, VCPU_CPTR_EL2, CPTR_EL2_TAM, 0); } +static void feature_mte_trap_activate(struct kvm_vcpu *vcpu) +{ + feature_trap_activate(vcpu, VCPU_HCR_EL2, HCR_TID5, HCR_DCT | HCR_ATA); +} + /* For ID_AA64PFR0_EL1 */ static struct feature_config_ctrl ftr_ctrl_ras = { .ftr_reg = SYS_ID_AA64PFR0_EL1, @@ -362,6 +367,15 @@ static struct feature_config_ctrl ftr_ctrl_amu = { .trap_activate = feature_amu_trap_activate, }; +/* For ID_AA64PFR1_EL1 */ +static struct feature_config_ctrl ftr_ctrl_mte = { + .ftr_reg = SYS_ID_AA64PFR1_EL1, + .ftr_shift = ID_AA64PFR1_MTE_SHIFT, + .ftr_min = ID_AA64PFR1_MTE_EL0, + .ftr_signed = FTR_UNSIGNED, + .trap_activate = feature_mte_trap_activate, +}; + /* id_reg_desc flags field values */ #define ID_DESC_REG_UNALLOC (1UL << 0) #define ID_DESC_REG_HIDDEN (1UL << 1) @@ -3682,6 +3696,10 @@ static struct id_reg_desc id_aa64pfr1_el1_desc = { .init = init_id_aa64pfr1_el1_desc, .validate = validate_id_aa64pfr1_el1, .vcpu_mask = vcpu_mask_id_aa64pfr1_el1, + .trap_features = &(const struct feature_config_ctrl *[]) { + &ftr_ctrl_mte, + NULL, + }, }; static struct id_reg_desc id_aa64isar0_el1_desc = { -- 2.35.1.723.g4982287a31-goog