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 72b7cfaef41e..a3d22f7f642b 100644
--- a/arch/arm64/kvm/sys_regs.c
+++ b/arch/arm64/kvm/sys_regs.c
@@ -344,6 +344,11 @@ 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,
@@ -361,6 +366,15 @@ 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,
+};
+
struct id_reg_info {
/* Register ID */
u32 sys_reg;
@@ -885,6 +899,10 @@ static struct id_reg_info id_aa64pfr1_el1_info = {
.init = init_id_aa64pfr1_el1_info,
.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_info id_aa64isar0_el1_info = {
--
2.35.1.265.g69c8d7142f-goog
