KVM: arm64: Expose MTE_STORE_ONLY feature to guest

expose MTE_STORE_ONLY feature to guest.

Signed-off-by: Yeoreum Yun <[email protected]>
Acked-by: Marc Zyngier <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Catalin Marinas <[email protected]>

Author: LeviYeoReum

arch/arm64/kvm/sys_regs.c

@@ -1618,7 +1618,9 @@ static u64 __kvm_read_sanitised_id_reg(const struct kvm_vcpu *vcpu,
 		break;
 	case SYS_ID_AA64PFR2_EL1:
 		val &= ID_AA64PFR2_EL1_FPMR |
-			(kvm_has_mte(vcpu->kvm) ? ID_AA64PFR2_EL1_MTEFAR : 0);
+			(kvm_has_mte(vcpu->kvm) ?
+			 ID_AA64PFR2_EL1_MTEFAR | ID_AA64PFR2_EL1_MTESTOREONLY :
+			 0);
 		break;
 	case SYS_ID_AA64ISAR1_EL1:
 		if (!vcpu_has_ptrauth(vcpu))
@@ -2878,7 +2880,8 @@ static const struct sys_reg_desc sys_reg_descs[] = {
 				       ID_AA64PFR1_EL1_MTE)),
 	ID_WRITABLE(ID_AA64PFR2_EL1,
 		    ID_AA64PFR2_EL1_FPMR |
-		    ID_AA64PFR2_EL1_MTEFAR),
+		    ID_AA64PFR2_EL1_MTEFAR |
+		    ID_AA64PFR2_EL1_MTESTOREONLY),
 	ID_UNALLOCATED(4,3),
 	ID_WRITABLE(ID_AA64ZFR0_EL1, ~ID_AA64ZFR0_EL1_RES0),
 	ID_HIDDEN(ID_AA64SMFR0_EL1),