diff options
| -rw-r--r-- | arch/s390/kvm/gaccess.c | 53 | ||||
| -rw-r--r-- | arch/s390/kvm/gaccess.h | 3 |
2 files changed, 56 insertions, 0 deletions
diff --git a/arch/s390/kvm/gaccess.c b/arch/s390/kvm/gaccess.c index db608c3f9303..5f73826992f2 100644 --- a/arch/s390/kvm/gaccess.c +++ b/arch/s390/kvm/gaccess.c @@ -645,6 +645,59 @@ int access_guest_real(struct kvm_vcpu *vcpu, unsigned long gra, } /** + * guest_translate_address - translate guest logical into guest absolute address + * + * Parameter semantics are the same as the ones from guest_translate. + * The memory contents at the guest address are not changed. + * + * Note: The IPTE lock is not taken during this function, so the caller + * has to take care of this. + */ +int guest_translate_address(struct kvm_vcpu *vcpu, unsigned long gva, + unsigned long *gpa, int write) +{ + struct kvm_s390_pgm_info *pgm = &vcpu->arch.pgm; + psw_t *psw = &vcpu->arch.sie_block->gpsw; + struct trans_exc_code_bits *tec; + union asce asce; + int rc; + + /* Access register mode is not supported yet. */ + if (psw_bits(*psw).t && psw_bits(*psw).as == PSW_AS_ACCREG) + return -EOPNOTSUPP; + + gva = kvm_s390_logical_to_effective(vcpu, gva); + memset(pgm, 0, sizeof(*pgm)); + tec = (struct trans_exc_code_bits *)&pgm->trans_exc_code; + tec->as = psw_bits(*psw).as; + tec->fsi = write ? FSI_STORE : FSI_FETCH; + tec->addr = gva >> PAGE_SHIFT; + if (is_low_address(gva) && low_address_protection_enabled(vcpu)) { + if (write) { + rc = pgm->code = PGM_PROTECTION; + return rc; + } + } + + asce.val = get_vcpu_asce(vcpu); + if (psw_bits(*psw).t && !asce.r) { /* Use DAT? */ + rc = guest_translate(vcpu, gva, gpa, write); + if (rc > 0) { + if (rc == PGM_PROTECTION) + tec->b61 = 1; + pgm->code = rc; + } + } else { + rc = 0; + *gpa = kvm_s390_real_to_abs(vcpu, gva); + if (kvm_is_error_gpa(vcpu->kvm, *gpa)) + rc = pgm->code = PGM_ADDRESSING; + } + + return rc; +} + +/** * kvm_s390_check_low_addr_protection - check for low-address protection * @ga: Guest address * diff --git a/arch/s390/kvm/gaccess.h b/arch/s390/kvm/gaccess.h index a07ee08ac478..2d37a46195e2 100644 --- a/arch/s390/kvm/gaccess.h +++ b/arch/s390/kvm/gaccess.h @@ -155,6 +155,9 @@ int read_guest_lc(struct kvm_vcpu *vcpu, unsigned long gra, void *data, return kvm_read_guest(vcpu->kvm, gpa, data, len); } +int guest_translate_address(struct kvm_vcpu *vcpu, unsigned long gva, + unsigned long *gpa, int write); + int access_guest(struct kvm_vcpu *vcpu, unsigned long ga, void *data, unsigned long len, int write); |