| /* | |
| * guest access functions | |
| * | |
| * Copyright IBM Corp. 2014 | |
| * | |
| */ | |
| #include <linux/vmalloc.h> | |
| #include <linux/err.h> | |
| #include <asm/pgtable.h> | |
| #include "kvm-s390.h" | |
| #include "gaccess.h" | |
| #include <asm/switch_to.h> | |
| union asce { | |
| unsigned long val; | |
| struct { | |
| unsigned long origin : 52; /* Region- or Segment-Table Origin */ | |
| unsigned long : 2; | |
| unsigned long g : 1; /* Subspace Group Control */ | |
| unsigned long p : 1; /* Private Space Control */ | |
| unsigned long s : 1; /* Storage-Alteration-Event Control */ | |
| unsigned long x : 1; /* Space-Switch-Event Control */ | |
| unsigned long r : 1; /* Real-Space Control */ | |
| unsigned long : 1; | |
| unsigned long dt : 2; /* Designation-Type Control */ | |
| unsigned long tl : 2; /* Region- or Segment-Table Length */ | |
| }; | |
| }; | |
| enum { | |
| ASCE_TYPE_SEGMENT = 0, | |
| ASCE_TYPE_REGION3 = 1, | |
| ASCE_TYPE_REGION2 = 2, | |
| ASCE_TYPE_REGION1 = 3 | |
| }; | |
| union region1_table_entry { | |
| unsigned long val; | |
| struct { | |
| unsigned long rto: 52;/* Region-Table Origin */ | |
| unsigned long : 2; | |
| unsigned long p : 1; /* DAT-Protection Bit */ | |
| unsigned long : 1; | |
| unsigned long tf : 2; /* Region-Second-Table Offset */ | |
| unsigned long i : 1; /* Region-Invalid Bit */ | |
| unsigned long : 1; | |
| unsigned long tt : 2; /* Table-Type Bits */ | |
| unsigned long tl : 2; /* Region-Second-Table Length */ | |
| }; | |
| }; | |
| union region2_table_entry { | |
| unsigned long val; | |
| struct { | |
| unsigned long rto: 52;/* Region-Table Origin */ | |
| unsigned long : 2; | |
| unsigned long p : 1; /* DAT-Protection Bit */ | |
| unsigned long : 1; | |
| unsigned long tf : 2; /* Region-Third-Table Offset */ | |
| unsigned long i : 1; /* Region-Invalid Bit */ | |
| unsigned long : 1; | |
| unsigned long tt : 2; /* Table-Type Bits */ | |
| unsigned long tl : 2; /* Region-Third-Table Length */ | |
| }; | |
| }; | |
| struct region3_table_entry_fc0 { | |
| unsigned long sto: 52;/* Segment-Table Origin */ | |
| unsigned long : 1; | |
| unsigned long fc : 1; /* Format-Control */ | |
| unsigned long p : 1; /* DAT-Protection Bit */ | |
| unsigned long : 1; | |
| unsigned long tf : 2; /* Segment-Table Offset */ | |
| unsigned long i : 1; /* Region-Invalid Bit */ | |
| unsigned long cr : 1; /* Common-Region Bit */ | |
| unsigned long tt : 2; /* Table-Type Bits */ | |
| unsigned long tl : 2; /* Segment-Table Length */ | |
| }; | |
| struct region3_table_entry_fc1 { | |
| unsigned long rfaa : 33; /* Region-Frame Absolute Address */ | |
| unsigned long : 14; | |
| unsigned long av : 1; /* ACCF-Validity Control */ | |
| unsigned long acc: 4; /* Access-Control Bits */ | |
| unsigned long f : 1; /* Fetch-Protection Bit */ | |
| unsigned long fc : 1; /* Format-Control */ | |
| unsigned long p : 1; /* DAT-Protection Bit */ | |
| unsigned long co : 1; /* Change-Recording Override */ | |
| unsigned long : 2; | |
| unsigned long i : 1; /* Region-Invalid Bit */ | |
| unsigned long cr : 1; /* Common-Region Bit */ | |
| unsigned long tt : 2; /* Table-Type Bits */ | |
| unsigned long : 2; | |
| }; | |
| union region3_table_entry { | |
| unsigned long val; | |
| struct region3_table_entry_fc0 fc0; | |
| struct region3_table_entry_fc1 fc1; | |
| struct { | |
| unsigned long : 53; | |
| unsigned long fc : 1; /* Format-Control */ | |
| unsigned long : 4; | |
| unsigned long i : 1; /* Region-Invalid Bit */ | |
| unsigned long cr : 1; /* Common-Region Bit */ | |
| unsigned long tt : 2; /* Table-Type Bits */ | |
| unsigned long : 2; | |
| }; | |
| }; | |
| struct segment_entry_fc0 { | |
| unsigned long pto: 53;/* Page-Table Origin */ | |
| unsigned long fc : 1; /* Format-Control */ | |
| unsigned long p : 1; /* DAT-Protection Bit */ | |
| unsigned long : 3; | |
| unsigned long i : 1; /* Segment-Invalid Bit */ | |
| unsigned long cs : 1; /* Common-Segment Bit */ | |
| unsigned long tt : 2; /* Table-Type Bits */ | |
| unsigned long : 2; | |
| }; | |
| struct segment_entry_fc1 { | |
| unsigned long sfaa : 44; /* Segment-Frame Absolute Address */ | |
| unsigned long : 3; | |
| unsigned long av : 1; /* ACCF-Validity Control */ | |
| unsigned long acc: 4; /* Access-Control Bits */ | |
| unsigned long f : 1; /* Fetch-Protection Bit */ | |
| unsigned long fc : 1; /* Format-Control */ | |
| unsigned long p : 1; /* DAT-Protection Bit */ | |
| unsigned long co : 1; /* Change-Recording Override */ | |
| unsigned long : 2; | |
| unsigned long i : 1; /* Segment-Invalid Bit */ | |
| unsigned long cs : 1; /* Common-Segment Bit */ | |
| unsigned long tt : 2; /* Table-Type Bits */ | |
| unsigned long : 2; | |
| }; | |
| union segment_table_entry { | |
| unsigned long val; | |
| struct segment_entry_fc0 fc0; | |
| struct segment_entry_fc1 fc1; | |
| struct { | |
| unsigned long : 53; | |
| unsigned long fc : 1; /* Format-Control */ | |
| unsigned long : 4; | |
| unsigned long i : 1; /* Segment-Invalid Bit */ | |
| unsigned long cs : 1; /* Common-Segment Bit */ | |
| unsigned long tt : 2; /* Table-Type Bits */ | |
| unsigned long : 2; | |
| }; | |
| }; | |
| enum { | |
| TABLE_TYPE_SEGMENT = 0, | |
| TABLE_TYPE_REGION3 = 1, | |
| TABLE_TYPE_REGION2 = 2, | |
| TABLE_TYPE_REGION1 = 3 | |
| }; | |
| union page_table_entry { | |
| unsigned long val; | |
| struct { | |
| unsigned long pfra : 52; /* Page-Frame Real Address */ | |
| unsigned long z : 1; /* Zero Bit */ | |
| unsigned long i : 1; /* Page-Invalid Bit */ | |
| unsigned long p : 1; /* DAT-Protection Bit */ | |
| unsigned long co : 1; /* Change-Recording Override */ | |
| unsigned long : 8; | |
| }; | |
| }; | |
| /* | |
| * vaddress union in order to easily decode a virtual address into its | |
| * region first index, region second index etc. parts. | |
| */ | |
| union vaddress { | |
| unsigned long addr; | |
| struct { | |
| unsigned long rfx : 11; | |
| unsigned long rsx : 11; | |
| unsigned long rtx : 11; | |
| unsigned long sx : 11; | |
| unsigned long px : 8; | |
| unsigned long bx : 12; | |
| }; | |
| struct { | |
| unsigned long rfx01 : 2; | |
| unsigned long : 9; | |
| unsigned long rsx01 : 2; | |
| unsigned long : 9; | |
| unsigned long rtx01 : 2; | |
| unsigned long : 9; | |
| unsigned long sx01 : 2; | |
| unsigned long : 29; | |
| }; | |
| }; | |
| /* | |
| * raddress union which will contain the result (real or absolute address) | |
| * after a page table walk. The rfaa, sfaa and pfra members are used to | |
| * simply assign them the value of a region, segment or page table entry. | |
| */ | |
| union raddress { | |
| unsigned long addr; | |
| unsigned long rfaa : 33; /* Region-Frame Absolute Address */ | |
| unsigned long sfaa : 44; /* Segment-Frame Absolute Address */ | |
| unsigned long pfra : 52; /* Page-Frame Real Address */ | |
| }; | |
| union alet { | |
| u32 val; | |
| struct { | |
| u32 reserved : 7; | |
| u32 p : 1; | |
| u32 alesn : 8; | |
| u32 alen : 16; | |
| }; | |
| }; | |
| union ald { | |
| u32 val; | |
| struct { | |
| u32 : 1; | |
| u32 alo : 24; | |
| u32 all : 7; | |
| }; | |
| }; | |
| struct ale { | |
| unsigned long i : 1; /* ALEN-Invalid Bit */ | |
| unsigned long : 5; | |
| unsigned long fo : 1; /* Fetch-Only Bit */ | |
| unsigned long p : 1; /* Private Bit */ | |
| unsigned long alesn : 8; /* Access-List-Entry Sequence Number */ | |
| unsigned long aleax : 16; /* Access-List-Entry Authorization Index */ | |
| unsigned long : 32; | |
| unsigned long : 1; | |
| unsigned long asteo : 25; /* ASN-Second-Table-Entry Origin */ | |
| unsigned long : 6; | |
| unsigned long astesn : 32; /* ASTE Sequence Number */ | |
| } __packed; | |
| struct aste { | |
| unsigned long i : 1; /* ASX-Invalid Bit */ | |
| unsigned long ato : 29; /* Authority-Table Origin */ | |
| unsigned long : 1; | |
| unsigned long b : 1; /* Base-Space Bit */ | |
| unsigned long ax : 16; /* Authorization Index */ | |
| unsigned long atl : 12; /* Authority-Table Length */ | |
| unsigned long : 2; | |
| unsigned long ca : 1; /* Controlled-ASN Bit */ | |
| unsigned long ra : 1; /* Reusable-ASN Bit */ | |
| unsigned long asce : 64; /* Address-Space-Control Element */ | |
| unsigned long ald : 32; | |
| unsigned long astesn : 32; | |
| /* .. more fields there */ | |
| } __packed; | |
| int ipte_lock_held(struct kvm_vcpu *vcpu) | |
| { | |
| if (vcpu->arch.sie_block->eca & 1) { | |
| int rc; | |
| read_lock(&vcpu->kvm->arch.sca_lock); | |
| rc = kvm_s390_get_ipte_control(vcpu->kvm)->kh != 0; | |
| read_unlock(&vcpu->kvm->arch.sca_lock); | |
| return rc; | |
| } | |
| return vcpu->kvm->arch.ipte_lock_count != 0; | |
| } | |
| static void ipte_lock_simple(struct kvm_vcpu *vcpu) | |
| { | |
| union ipte_control old, new, *ic; | |
| mutex_lock(&vcpu->kvm->arch.ipte_mutex); | |
| vcpu->kvm->arch.ipte_lock_count++; | |
| if (vcpu->kvm->arch.ipte_lock_count > 1) | |
| goto out; | |
| retry: | |
| read_lock(&vcpu->kvm->arch.sca_lock); | |
| ic = kvm_s390_get_ipte_control(vcpu->kvm); | |
| do { | |
| old = READ_ONCE(*ic); | |
| if (old.k) { | |
| read_unlock(&vcpu->kvm->arch.sca_lock); | |
| cond_resched(); | |
| goto retry; | |
| } | |
| new = old; | |
| new.k = 1; | |
| } while (cmpxchg(&ic->val, old.val, new.val) != old.val); | |
| read_unlock(&vcpu->kvm->arch.sca_lock); | |
| out: | |
| mutex_unlock(&vcpu->kvm->arch.ipte_mutex); | |
| } | |
| static void ipte_unlock_simple(struct kvm_vcpu *vcpu) | |
| { | |
| union ipte_control old, new, *ic; | |
| mutex_lock(&vcpu->kvm->arch.ipte_mutex); | |
| vcpu->kvm->arch.ipte_lock_count--; | |
| if (vcpu->kvm->arch.ipte_lock_count) | |
| goto out; | |
| read_lock(&vcpu->kvm->arch.sca_lock); | |
| ic = kvm_s390_get_ipte_control(vcpu->kvm); | |
| do { | |
| old = READ_ONCE(*ic); | |
| new = old; | |
| new.k = 0; | |
| } while (cmpxchg(&ic->val, old.val, new.val) != old.val); | |
| read_unlock(&vcpu->kvm->arch.sca_lock); | |
| wake_up(&vcpu->kvm->arch.ipte_wq); | |
| out: | |
| mutex_unlock(&vcpu->kvm->arch.ipte_mutex); | |
| } | |
| static void ipte_lock_siif(struct kvm_vcpu *vcpu) | |
| { | |
| union ipte_control old, new, *ic; | |
| retry: | |
| read_lock(&vcpu->kvm->arch.sca_lock); | |
| ic = kvm_s390_get_ipte_control(vcpu->kvm); | |
| do { | |
| old = READ_ONCE(*ic); | |
| if (old.kg) { | |
| read_unlock(&vcpu->kvm->arch.sca_lock); | |
| cond_resched(); | |
| goto retry; | |
| } | |
| new = old; | |
| new.k = 1; | |
| new.kh++; | |
| } while (cmpxchg(&ic->val, old.val, new.val) != old.val); | |
| read_unlock(&vcpu->kvm->arch.sca_lock); | |
| } | |
| static void ipte_unlock_siif(struct kvm_vcpu *vcpu) | |
| { | |
| union ipte_control old, new, *ic; | |
| read_lock(&vcpu->kvm->arch.sca_lock); | |
| ic = kvm_s390_get_ipte_control(vcpu->kvm); | |
| do { | |
| old = READ_ONCE(*ic); | |
| new = old; | |
| new.kh--; | |
| if (!new.kh) | |
| new.k = 0; | |
| } while (cmpxchg(&ic->val, old.val, new.val) != old.val); | |
| read_unlock(&vcpu->kvm->arch.sca_lock); | |
| if (!new.kh) | |
| wake_up(&vcpu->kvm->arch.ipte_wq); | |
| } | |
| void ipte_lock(struct kvm_vcpu *vcpu) | |
| { | |
| if (vcpu->arch.sie_block->eca & 1) | |
| ipte_lock_siif(vcpu); | |
| else | |
| ipte_lock_simple(vcpu); | |
| } | |
| void ipte_unlock(struct kvm_vcpu *vcpu) | |
| { | |
| if (vcpu->arch.sie_block->eca & 1) | |
| ipte_unlock_siif(vcpu); | |
| else | |
| ipte_unlock_simple(vcpu); | |
| } | |
| static int ar_translation(struct kvm_vcpu *vcpu, union asce *asce, ar_t ar, | |
| enum gacc_mode mode) | |
| { | |
| union alet alet; | |
| struct ale ale; | |
| struct aste aste; | |
| unsigned long ald_addr, authority_table_addr; | |
| union ald ald; | |
| int eax, rc; | |
| u8 authority_table; | |
| if (ar >= NUM_ACRS) | |
| return -EINVAL; | |
| save_access_regs(vcpu->run->s.regs.acrs); | |
| alet.val = vcpu->run->s.regs.acrs[ar]; | |
| if (ar == 0 || alet.val == 0) { | |
| asce->val = vcpu->arch.sie_block->gcr[1]; | |
| return 0; | |
| } else if (alet.val == 1) { | |
| asce->val = vcpu->arch.sie_block->gcr[7]; | |
| return 0; | |
| } | |
| if (alet.reserved) | |
| return PGM_ALET_SPECIFICATION; | |
| if (alet.p) | |
| ald_addr = vcpu->arch.sie_block->gcr[5]; | |
| else | |
| ald_addr = vcpu->arch.sie_block->gcr[2]; | |
| ald_addr &= 0x7fffffc0; | |
| rc = read_guest_real(vcpu, ald_addr + 16, &ald.val, sizeof(union ald)); | |
| if (rc) | |
| return rc; | |
| if (alet.alen / 8 > ald.all) | |
| return PGM_ALEN_TRANSLATION; | |
| if (0x7fffffff - ald.alo * 128 < alet.alen * 16) | |
| return PGM_ADDRESSING; | |
| rc = read_guest_real(vcpu, ald.alo * 128 + alet.alen * 16, &ale, | |
| sizeof(struct ale)); | |
| if (rc) | |
| return rc; | |
| if (ale.i == 1) | |
| return PGM_ALEN_TRANSLATION; | |
| if (ale.alesn != alet.alesn) | |
| return PGM_ALE_SEQUENCE; | |
| rc = read_guest_real(vcpu, ale.asteo * 64, &aste, sizeof(struct aste)); | |
| if (rc) | |
| return rc; | |
| if (aste.i) | |
| return PGM_ASTE_VALIDITY; | |
| if (aste.astesn != ale.astesn) | |
| return PGM_ASTE_SEQUENCE; | |
| if (ale.p == 1) { | |
| eax = (vcpu->arch.sie_block->gcr[8] >> 16) & 0xffff; | |
| if (ale.aleax != eax) { | |
| if (eax / 16 > aste.atl) | |
| return PGM_EXTENDED_AUTHORITY; | |
| authority_table_addr = aste.ato * 4 + eax / 4; | |
| rc = read_guest_real(vcpu, authority_table_addr, | |
| &authority_table, | |
| sizeof(u8)); | |
| if (rc) | |
| return rc; | |
| if ((authority_table & (0x40 >> ((eax & 3) * 2))) == 0) | |
| return PGM_EXTENDED_AUTHORITY; | |
| } | |
| } | |
| if (ale.fo == 1 && mode == GACC_STORE) | |
| return PGM_PROTECTION; | |
| asce->val = aste.asce; | |
| return 0; | |
| } | |
| struct trans_exc_code_bits { | |
| unsigned long addr : 52; /* Translation-exception Address */ | |
| unsigned long fsi : 2; /* Access Exception Fetch/Store Indication */ | |
| unsigned long : 6; | |
| unsigned long b60 : 1; | |
| unsigned long b61 : 1; | |
| unsigned long as : 2; /* ASCE Identifier */ | |
| }; | |
| enum { | |
| FSI_UNKNOWN = 0, /* Unknown wether fetch or store */ | |
| FSI_STORE = 1, /* Exception was due to store operation */ | |
| FSI_FETCH = 2 /* Exception was due to fetch operation */ | |
| }; | |
| static int get_vcpu_asce(struct kvm_vcpu *vcpu, union asce *asce, | |
| ar_t ar, enum gacc_mode mode) | |
| { | |
| int rc; | |
| struct psw_bits psw = psw_bits(vcpu->arch.sie_block->gpsw); | |
| struct kvm_s390_pgm_info *pgm = &vcpu->arch.pgm; | |
| struct trans_exc_code_bits *tec_bits; | |
| memset(pgm, 0, sizeof(*pgm)); | |
| tec_bits = (struct trans_exc_code_bits *)&pgm->trans_exc_code; | |
| tec_bits->fsi = mode == GACC_STORE ? FSI_STORE : FSI_FETCH; | |
| tec_bits->as = psw.as; | |
| if (!psw.t) { | |
| asce->val = 0; | |
| asce->r = 1; | |
| return 0; | |
| } | |
| if (mode == GACC_IFETCH) | |
| psw.as = psw.as == PSW_AS_HOME ? PSW_AS_HOME : PSW_AS_PRIMARY; | |
| switch (psw.as) { | |
| case PSW_AS_PRIMARY: | |
| asce->val = vcpu->arch.sie_block->gcr[1]; | |
| return 0; | |
| case PSW_AS_SECONDARY: | |
| asce->val = vcpu->arch.sie_block->gcr[7]; | |
| return 0; | |
| case PSW_AS_HOME: | |
| asce->val = vcpu->arch.sie_block->gcr[13]; | |
| return 0; | |
| case PSW_AS_ACCREG: | |
| rc = ar_translation(vcpu, asce, ar, mode); | |
| switch (rc) { | |
| case PGM_ALEN_TRANSLATION: | |
| case PGM_ALE_SEQUENCE: | |
| case PGM_ASTE_VALIDITY: | |
| case PGM_ASTE_SEQUENCE: | |
| case PGM_EXTENDED_AUTHORITY: | |
| vcpu->arch.pgm.exc_access_id = ar; | |
| break; | |
| case PGM_PROTECTION: | |
| tec_bits->b60 = 1; | |
| tec_bits->b61 = 1; | |
| break; | |
| } | |
| if (rc > 0) | |
| pgm->code = rc; | |
| return rc; | |
| } | |
| return 0; | |
| } | |
| static int deref_table(struct kvm *kvm, unsigned long gpa, unsigned long *val) | |
| { | |
| return kvm_read_guest(kvm, gpa, val, sizeof(*val)); | |
| } | |
| /** | |
| * guest_translate - translate a guest virtual into a guest absolute address | |
| * @vcpu: virtual cpu | |
| * @gva: guest virtual address | |
| * @gpa: points to where guest physical (absolute) address should be stored | |
| * @asce: effective asce | |
| * @mode: indicates the access mode to be used | |
| * | |
| * Translate a guest virtual address into a guest absolute address by means | |
| * of dynamic address translation as specified by the architecture. | |
| * If the resulting absolute address is not available in the configuration | |
| * an addressing exception is indicated and @gpa will not be changed. | |
| * | |
| * Returns: - zero on success; @gpa contains the resulting absolute address | |
| * - a negative value if guest access failed due to e.g. broken | |
| * guest mapping | |
| * - a positve value if an access exception happened. In this case | |
| * the returned value is the program interruption code as defined | |
| * by the architecture | |
| */ | |
| static unsigned long guest_translate(struct kvm_vcpu *vcpu, unsigned long gva, | |
| unsigned long *gpa, const union asce asce, | |
| enum gacc_mode mode) | |
| { | |
| union vaddress vaddr = {.addr = gva}; | |
| union raddress raddr = {.addr = gva}; | |
| union page_table_entry pte; | |
| int dat_protection = 0; | |
| union ctlreg0 ctlreg0; | |
| unsigned long ptr; | |
| int edat1, edat2; | |
| ctlreg0.val = vcpu->arch.sie_block->gcr[0]; | |
| edat1 = ctlreg0.edat && test_kvm_facility(vcpu->kvm, 8); | |
| edat2 = edat1 && test_kvm_facility(vcpu->kvm, 78); | |
| if (asce.r) | |
| goto real_address; | |
| ptr = asce.origin * 4096; | |
| switch (asce.dt) { | |
| case ASCE_TYPE_REGION1: | |
| if (vaddr.rfx01 > asce.tl) | |
| return PGM_REGION_FIRST_TRANS; | |
| ptr += vaddr.rfx * 8; | |
| break; | |
| case ASCE_TYPE_REGION2: | |
| if (vaddr.rfx) | |
| return PGM_ASCE_TYPE; | |
| if (vaddr.rsx01 > asce.tl) | |
| return PGM_REGION_SECOND_TRANS; | |
| ptr += vaddr.rsx * 8; | |
| break; | |
| case ASCE_TYPE_REGION3: | |
| if (vaddr.rfx || vaddr.rsx) | |
| return PGM_ASCE_TYPE; | |
| if (vaddr.rtx01 > asce.tl) | |
| return PGM_REGION_THIRD_TRANS; | |
| ptr += vaddr.rtx * 8; | |
| break; | |
| case ASCE_TYPE_SEGMENT: | |
| if (vaddr.rfx || vaddr.rsx || vaddr.rtx) | |
| return PGM_ASCE_TYPE; | |
| if (vaddr.sx01 > asce.tl) | |
| return PGM_SEGMENT_TRANSLATION; | |
| ptr += vaddr.sx * 8; | |
| break; | |
| } | |
| switch (asce.dt) { | |
| case ASCE_TYPE_REGION1: { | |
| union region1_table_entry rfte; | |
| if (kvm_is_error_gpa(vcpu->kvm, ptr)) | |
| return PGM_ADDRESSING; | |
| if (deref_table(vcpu->kvm, ptr, &rfte.val)) | |
| return -EFAULT; | |
| if (rfte.i) | |
| return PGM_REGION_FIRST_TRANS; | |
| if (rfte.tt != TABLE_TYPE_REGION1) | |
| return PGM_TRANSLATION_SPEC; | |
| if (vaddr.rsx01 < rfte.tf || vaddr.rsx01 > rfte.tl) | |
| return PGM_REGION_SECOND_TRANS; | |
| if (edat1) | |
| dat_protection |= rfte.p; | |
| ptr = rfte.rto * 4096 + vaddr.rsx * 8; | |
| } | |
| /* fallthrough */ | |
| case ASCE_TYPE_REGION2: { | |
| union region2_table_entry rste; | |
| if (kvm_is_error_gpa(vcpu->kvm, ptr)) | |
| return PGM_ADDRESSING; | |
| if (deref_table(vcpu->kvm, ptr, &rste.val)) | |
| return -EFAULT; | |
| if (rste.i) | |
| return PGM_REGION_SECOND_TRANS; | |
| if (rste.tt != TABLE_TYPE_REGION2) | |
| return PGM_TRANSLATION_SPEC; | |
| if (vaddr.rtx01 < rste.tf || vaddr.rtx01 > rste.tl) | |
| return PGM_REGION_THIRD_TRANS; | |
| if (edat1) | |
| dat_protection |= rste.p; | |
| ptr = rste.rto * 4096 + vaddr.rtx * 8; | |
| } | |
| /* fallthrough */ | |
| case ASCE_TYPE_REGION3: { | |
| union region3_table_entry rtte; | |
| if (kvm_is_error_gpa(vcpu->kvm, ptr)) | |
| return PGM_ADDRESSING; | |
| if (deref_table(vcpu->kvm, ptr, &rtte.val)) | |
| return -EFAULT; | |
| if (rtte.i) | |
| return PGM_REGION_THIRD_TRANS; | |
| if (rtte.tt != TABLE_TYPE_REGION3) | |
| return PGM_TRANSLATION_SPEC; | |
| if (rtte.cr && asce.p && edat2) | |
| return PGM_TRANSLATION_SPEC; | |
| if (rtte.fc && edat2) { | |
| dat_protection |= rtte.fc1.p; | |
| raddr.rfaa = rtte.fc1.rfaa; | |
| goto absolute_address; | |
| } | |
| if (vaddr.sx01 < rtte.fc0.tf) | |
| return PGM_SEGMENT_TRANSLATION; | |
| if (vaddr.sx01 > rtte.fc0.tl) | |
| return PGM_SEGMENT_TRANSLATION; | |
| if (edat1) | |
| dat_protection |= rtte.fc0.p; | |
| ptr = rtte.fc0.sto * 4096 + vaddr.sx * 8; | |
| } | |
| /* fallthrough */ | |
| case ASCE_TYPE_SEGMENT: { | |
| union segment_table_entry ste; | |
| if (kvm_is_error_gpa(vcpu->kvm, ptr)) | |
| return PGM_ADDRESSING; | |
| if (deref_table(vcpu->kvm, ptr, &ste.val)) | |
| return -EFAULT; | |
| if (ste.i) | |
| return PGM_SEGMENT_TRANSLATION; | |
| if (ste.tt != TABLE_TYPE_SEGMENT) | |
| return PGM_TRANSLATION_SPEC; | |
| if (ste.cs && asce.p) | |
| return PGM_TRANSLATION_SPEC; | |
| if (ste.fc && edat1) { | |
| dat_protection |= ste.fc1.p; | |
| raddr.sfaa = ste.fc1.sfaa; | |
| goto absolute_address; | |
| } | |
| dat_protection |= ste.fc0.p; | |
| ptr = ste.fc0.pto * 2048 + vaddr.px * 8; | |
| } | |
| } | |
| if (kvm_is_error_gpa(vcpu->kvm, ptr)) | |
| return PGM_ADDRESSING; | |
| if (deref_table(vcpu->kvm, ptr, &pte.val)) | |
| return -EFAULT; | |
| if (pte.i) | |
| return PGM_PAGE_TRANSLATION; | |
| if (pte.z) | |
| return PGM_TRANSLATION_SPEC; | |
| if (pte.co && !edat1) | |
| return PGM_TRANSLATION_SPEC; | |
| dat_protection |= pte.p; | |
| raddr.pfra = pte.pfra; | |
| real_address: | |
| raddr.addr = kvm_s390_real_to_abs(vcpu, raddr.addr); | |
| absolute_address: | |
| if (mode == GACC_STORE && dat_protection) | |
| return PGM_PROTECTION; | |
| if (kvm_is_error_gpa(vcpu->kvm, raddr.addr)) | |
| return PGM_ADDRESSING; | |
| *gpa = raddr.addr; | |
| return 0; | |
| } | |
| static inline int is_low_address(unsigned long ga) | |
| { | |
| /* Check for address ranges 0..511 and 4096..4607 */ | |
| return (ga & ~0x11fful) == 0; | |
| } | |
| static int low_address_protection_enabled(struct kvm_vcpu *vcpu, | |
| const union asce asce) | |
| { | |
| union ctlreg0 ctlreg0 = {.val = vcpu->arch.sie_block->gcr[0]}; | |
| psw_t *psw = &vcpu->arch.sie_block->gpsw; | |
| if (!ctlreg0.lap) | |
| return 0; | |
| if (psw_bits(*psw).t && asce.p) | |
| return 0; | |
| return 1; | |
| } | |
| static int guest_page_range(struct kvm_vcpu *vcpu, unsigned long ga, | |
| unsigned long *pages, unsigned long nr_pages, | |
| const union asce asce, enum gacc_mode mode) | |
| { | |
| struct kvm_s390_pgm_info *pgm = &vcpu->arch.pgm; | |
| psw_t *psw = &vcpu->arch.sie_block->gpsw; | |
| struct trans_exc_code_bits *tec_bits; | |
| int lap_enabled, rc; | |
| tec_bits = (struct trans_exc_code_bits *)&pgm->trans_exc_code; | |
| lap_enabled = low_address_protection_enabled(vcpu, asce); | |
| while (nr_pages) { | |
| ga = kvm_s390_logical_to_effective(vcpu, ga); | |
| tec_bits->addr = ga >> PAGE_SHIFT; | |
| if (mode == GACC_STORE && lap_enabled && is_low_address(ga)) { | |
| pgm->code = PGM_PROTECTION; | |
| return pgm->code; | |
| } | |
| ga &= PAGE_MASK; | |
| if (psw_bits(*psw).t) { | |
| rc = guest_translate(vcpu, ga, pages, asce, mode); | |
| if (rc < 0) | |
| return rc; | |
| if (rc == PGM_PROTECTION) | |
| tec_bits->b61 = 1; | |
| if (rc) | |
| pgm->code = rc; | |
| } else { | |
| *pages = kvm_s390_real_to_abs(vcpu, ga); | |
| if (kvm_is_error_gpa(vcpu->kvm, *pages)) | |
| pgm->code = PGM_ADDRESSING; | |
| } | |
| if (pgm->code) | |
| return pgm->code; | |
| ga += PAGE_SIZE; | |
| pages++; | |
| nr_pages--; | |
| } | |
| return 0; | |
| } | |
| int access_guest(struct kvm_vcpu *vcpu, unsigned long ga, ar_t ar, void *data, | |
| unsigned long len, enum gacc_mode mode) | |
| { | |
| psw_t *psw = &vcpu->arch.sie_block->gpsw; | |
| unsigned long _len, nr_pages, gpa, idx; | |
| unsigned long pages_array[2]; | |
| unsigned long *pages; | |
| int need_ipte_lock; | |
| union asce asce; | |
| int rc; | |
| if (!len) | |
| return 0; | |
| rc = get_vcpu_asce(vcpu, &asce, ar, mode); | |
| if (rc) | |
| return rc; | |
| nr_pages = (((ga & ~PAGE_MASK) + len - 1) >> PAGE_SHIFT) + 1; | |
| pages = pages_array; | |
| if (nr_pages > ARRAY_SIZE(pages_array)) | |
| pages = vmalloc(nr_pages * sizeof(unsigned long)); | |
| if (!pages) | |
| return -ENOMEM; | |
| need_ipte_lock = psw_bits(*psw).t && !asce.r; | |
| if (need_ipte_lock) | |
| ipte_lock(vcpu); | |
| rc = guest_page_range(vcpu, ga, pages, nr_pages, asce, mode); | |
| for (idx = 0; idx < nr_pages && !rc; idx++) { | |
| gpa = *(pages + idx) + (ga & ~PAGE_MASK); | |
| _len = min(PAGE_SIZE - (gpa & ~PAGE_MASK), len); | |
| if (mode == GACC_STORE) | |
| rc = kvm_write_guest(vcpu->kvm, gpa, data, _len); | |
| else | |
| rc = kvm_read_guest(vcpu->kvm, gpa, data, _len); | |
| len -= _len; | |
| ga += _len; | |
| data += _len; | |
| } | |
| if (need_ipte_lock) | |
| ipte_unlock(vcpu); | |
| if (nr_pages > ARRAY_SIZE(pages_array)) | |
| vfree(pages); | |
| return rc; | |
| } | |
| int access_guest_real(struct kvm_vcpu *vcpu, unsigned long gra, | |
| void *data, unsigned long len, enum gacc_mode mode) | |
| { | |
| unsigned long _len, gpa; | |
| int rc = 0; | |
| while (len && !rc) { | |
| gpa = kvm_s390_real_to_abs(vcpu, gra); | |
| _len = min(PAGE_SIZE - (gpa & ~PAGE_MASK), len); | |
| if (mode) | |
| rc = write_guest_abs(vcpu, gpa, data, _len); | |
| else | |
| rc = read_guest_abs(vcpu, gpa, data, _len); | |
| len -= _len; | |
| gra += _len; | |
| data += _len; | |
| } | |
| return rc; | |
| } | |
| /** | |
| * 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, ar_t ar, | |
| unsigned long *gpa, enum gacc_mode mode) | |
| { | |
| 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; | |
| gva = kvm_s390_logical_to_effective(vcpu, gva); | |
| tec = (struct trans_exc_code_bits *)&pgm->trans_exc_code; | |
| rc = get_vcpu_asce(vcpu, &asce, ar, mode); | |
| tec->addr = gva >> PAGE_SHIFT; | |
| if (rc) | |
| return rc; | |
| if (is_low_address(gva) && low_address_protection_enabled(vcpu, asce)) { | |
| if (mode == GACC_STORE) { | |
| rc = pgm->code = PGM_PROTECTION; | |
| return rc; | |
| } | |
| } | |
| if (psw_bits(*psw).t && !asce.r) { /* Use DAT? */ | |
| rc = guest_translate(vcpu, gva, gpa, asce, mode); | |
| 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; | |
| } | |
| /** | |
| * check_gva_range - test a range of guest virtual addresses for accessibility | |
| */ | |
| int check_gva_range(struct kvm_vcpu *vcpu, unsigned long gva, ar_t ar, | |
| unsigned long length, enum gacc_mode mode) | |
| { | |
| unsigned long gpa; | |
| unsigned long currlen; | |
| int rc = 0; | |
| ipte_lock(vcpu); | |
| while (length > 0 && !rc) { | |
| currlen = min(length, PAGE_SIZE - (gva % PAGE_SIZE)); | |
| rc = guest_translate_address(vcpu, gva, ar, &gpa, mode); | |
| gva += currlen; | |
| length -= currlen; | |
| } | |
| ipte_unlock(vcpu); | |
| return rc; | |
| } | |
| /** | |
| * kvm_s390_check_low_addr_prot_real - check for low-address protection | |
| * @gra: Guest real address | |
| * | |
| * Checks whether an address is subject to low-address protection and set | |
| * up vcpu->arch.pgm accordingly if necessary. | |
| * | |
| * Return: 0 if no protection exception, or PGM_PROTECTION if protected. | |
| */ | |
| int kvm_s390_check_low_addr_prot_real(struct kvm_vcpu *vcpu, unsigned long gra) | |
| { | |
| struct kvm_s390_pgm_info *pgm = &vcpu->arch.pgm; | |
| psw_t *psw = &vcpu->arch.sie_block->gpsw; | |
| struct trans_exc_code_bits *tec_bits; | |
| union ctlreg0 ctlreg0 = {.val = vcpu->arch.sie_block->gcr[0]}; | |
| if (!ctlreg0.lap || !is_low_address(gra)) | |
| return 0; | |
| memset(pgm, 0, sizeof(*pgm)); | |
| tec_bits = (struct trans_exc_code_bits *)&pgm->trans_exc_code; | |
| tec_bits->fsi = FSI_STORE; | |
| tec_bits->as = psw_bits(*psw).as; | |
| tec_bits->addr = gra >> PAGE_SHIFT; | |
| pgm->code = PGM_PROTECTION; | |
| return pgm->code; | |
| } |