diff options
| -rw-r--r-- | arch/s390/kvm/gaccess.c | 4 | ||||
| -rw-r--r-- | arch/s390/kvm/gaccess.h | 2 | ||||
| -rw-r--r-- | arch/s390/kvm/priv.c | 56 |
3 files changed, 37 insertions, 25 deletions
diff --git a/arch/s390/kvm/gaccess.c b/arch/s390/kvm/gaccess.c index 5f73826..4653ac6 100644 --- a/arch/s390/kvm/gaccess.c +++ b/arch/s390/kvm/gaccess.c @@ -292,7 +292,7 @@ static void ipte_unlock_siif(struct kvm_vcpu *vcpu) wake_up(&vcpu->kvm->arch.ipte_wq); } -static void ipte_lock(struct kvm_vcpu *vcpu) +void ipte_lock(struct kvm_vcpu *vcpu) { if (vcpu->arch.sie_block->eca & 1) ipte_lock_siif(vcpu); @@ -300,7 +300,7 @@ static void ipte_lock(struct kvm_vcpu *vcpu) ipte_lock_simple(vcpu); } -static void ipte_unlock(struct kvm_vcpu *vcpu) +void ipte_unlock(struct kvm_vcpu *vcpu) { if (vcpu->arch.sie_block->eca & 1) ipte_unlock_siif(vcpu); diff --git a/arch/s390/kvm/gaccess.h b/arch/s390/kvm/gaccess.h index 2d37a46..0149cf1 100644 --- a/arch/s390/kvm/gaccess.h +++ b/arch/s390/kvm/gaccess.h @@ -327,6 +327,8 @@ int read_guest_real(struct kvm_vcpu *vcpu, unsigned long gra, void *data, return access_guest_real(vcpu, gra, data, len, 0); } +void ipte_lock(struct kvm_vcpu *vcpu); +void ipte_unlock(struct kvm_vcpu *vcpu); int ipte_lock_held(struct kvm_vcpu *vcpu); int kvm_s390_check_low_addr_protection(struct kvm_vcpu *vcpu, unsigned long ga); diff --git a/arch/s390/kvm/priv.c b/arch/s390/kvm/priv.c index 6296159..f89c1cd 100644 --- a/arch/s390/kvm/priv.c +++ b/arch/s390/kvm/priv.c @@ -930,8 +930,9 @@ int kvm_s390_handle_eb(struct kvm_vcpu *vcpu) static int handle_tprot(struct kvm_vcpu *vcpu) { u64 address1, address2; - struct vm_area_struct *vma; - unsigned long user_address; + unsigned long hva, gpa; + int ret = 0, cc = 0; + bool writable; vcpu->stat.instruction_tprot++; @@ -942,32 +943,41 @@ static int handle_tprot(struct kvm_vcpu *vcpu) /* we only handle the Linux memory detection case: * access key == 0 - * guest DAT == off * everything else goes to userspace. */ if (address2 & 0xf0) return -EOPNOTSUPP; if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_DAT) - return -EOPNOTSUPP; - - down_read(¤t->mm->mmap_sem); - user_address = __gmap_translate(address1, vcpu->arch.gmap); - if (IS_ERR_VALUE(user_address)) - goto out_inject; - vma = find_vma(current->mm, user_address); - if (!vma) - goto out_inject; - vcpu->arch.sie_block->gpsw.mask &= ~(3ul << 44); - if (!(vma->vm_flags & VM_WRITE) && (vma->vm_flags & VM_READ)) - vcpu->arch.sie_block->gpsw.mask |= (1ul << 44); - if (!(vma->vm_flags & VM_WRITE) && !(vma->vm_flags & VM_READ)) - vcpu->arch.sie_block->gpsw.mask |= (2ul << 44); - - up_read(¤t->mm->mmap_sem); - return 0; + ipte_lock(vcpu); + ret = guest_translate_address(vcpu, address1, &gpa, 1); + if (ret == PGM_PROTECTION) { + /* Write protected? Try again with read-only... */ + cc = 1; + ret = guest_translate_address(vcpu, address1, &gpa, 0); + } + if (ret) { + if (ret == PGM_ADDRESSING || ret == PGM_TRANSLATION_SPEC) { + ret = kvm_s390_inject_program_int(vcpu, ret); + } else if (ret > 0) { + /* Translation not available */ + kvm_s390_set_psw_cc(vcpu, 3); + ret = 0; + } + goto out_unlock; + } -out_inject: - up_read(¤t->mm->mmap_sem); - return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); + hva = gfn_to_hva_prot(vcpu->kvm, gpa_to_gfn(gpa), &writable); + if (kvm_is_error_hva(hva)) { + ret = kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); + } else { + if (!writable) + cc = 1; /* Write not permitted ==> read-only */ + kvm_s390_set_psw_cc(vcpu, cc); + /* Note: CC2 only occurs for storage keys (not supported yet) */ + } +out_unlock: + if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_DAT) + ipte_unlock(vcpu); + return ret; } int kvm_s390_handle_e5(struct kvm_vcpu *vcpu) |