projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| e28acfea CB |
1 | /* |
| 2 | * diag.c - handling diagnose instructions | |
| 3 | * | |
| 388186bc | 4 | * Copyright IBM Corp. 2008,2011 |
| e28acfea CB |
5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify | |
| 7 | * it under the terms of the GNU General Public License (version 2 only) | |
| 8 | * as published by the Free Software Foundation. | |
| 9 | * | |
| 10 | * Author(s): Carsten Otte <cotte@de.ibm.com> | |
| 11 | * Christian Borntraeger <borntraeger@de.ibm.com> | |
| 12 | */ | |
| 13 | ||
| 14 | #include <linux/kvm.h> | |
| 15 | #include <linux/kvm_host.h> | |
| 16 | #include "kvm-s390.h" | |
| 17 | ||
| 388186bc CB |
18 | static int diag_release_pages(struct kvm_vcpu *vcpu) |
| 19 | { | |
| 20 | unsigned long start, end; | |
| 21 | unsigned long prefix = vcpu->arch.sie_block->prefix; | |
| 22 | ||
| 23 | start = vcpu->arch.guest_gprs[(vcpu->arch.sie_block->ipa & 0xf0) >> 4]; | |
| 24 | end = vcpu->arch.guest_gprs[vcpu->arch.sie_block->ipa & 0xf] + 4096; | |
| 25 | ||
| 26 | if (start & ~PAGE_MASK || end & ~PAGE_MASK || start > end | |
| 27 | || start < 2 * PAGE_SIZE) | |
| 28 | return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); | |
| 29 | ||
| 30 | VCPU_EVENT(vcpu, 5, "diag release pages %lX %lX", start, end); | |
| 31 | vcpu->stat.diagnose_10++; | |
| 32 | ||
| 33 | /* we checked for start > end above */ | |
| 34 | if (end < prefix || start >= prefix + 2 * PAGE_SIZE) { | |
| 35 | gmap_discard(start, end, vcpu->arch.gmap); | |
| 36 | } else { | |
| 37 | if (start < prefix) | |
| 38 | gmap_discard(start, prefix, vcpu->arch.gmap); | |
| 39 | if (end >= prefix) | |
| 40 | gmap_discard(prefix + 2 * PAGE_SIZE, | |
| 41 | end, vcpu->arch.gmap); | |
| 42 | } | |
| 43 | return 0; | |
| 44 | } | |
| 45 | ||
| e28acfea CB |
46 | static int __diag_time_slice_end(struct kvm_vcpu *vcpu) |
| 47 | { | |
| 48 | VCPU_EVENT(vcpu, 5, "%s", "diag time slice end"); | |
| 49 | vcpu->stat.diagnose_44++; | |
| 50 | vcpu_put(vcpu); | |
| b8cee18c | 51 | yield(); |
| e28acfea CB |
52 | vcpu_load(vcpu); |
| 53 | return 0; | |
| 54 | } | |
| 55 | ||
| 56 | static int __diag_ipl_functions(struct kvm_vcpu *vcpu) | |
| 57 | { | |
| 58 | unsigned int reg = vcpu->arch.sie_block->ipa & 0xf; | |
| 59 | unsigned long subcode = vcpu->arch.guest_gprs[reg] & 0xffff; | |
| 60 | ||
| 61 | VCPU_EVENT(vcpu, 5, "diag ipl functions, subcode %lx", subcode); | |
| 62 | switch (subcode) { | |
| 63 | case 3: | |
| 64 | vcpu->run->s390_reset_flags = KVM_S390_RESET_CLEAR; | |
| 65 | break; | |
| 66 | case 4: | |
| 67 | vcpu->run->s390_reset_flags = 0; | |
| 68 | break; | |
| 69 | default: | |
| b8e660b8 | 70 | return -EOPNOTSUPP; |
| e28acfea CB |
71 | } |
| 72 | ||
| 73 | atomic_clear_mask(CPUSTAT_RUNNING, &vcpu->arch.sie_block->cpuflags); | |
| 74 | vcpu->run->s390_reset_flags |= KVM_S390_RESET_SUBSYSTEM; | |
| 75 | vcpu->run->s390_reset_flags |= KVM_S390_RESET_IPL; | |
| 76 | vcpu->run->s390_reset_flags |= KVM_S390_RESET_CPU_INIT; | |
| 77 | vcpu->run->exit_reason = KVM_EXIT_S390_RESET; | |
| 33e19115 | 78 | VCPU_EVENT(vcpu, 3, "requesting userspace resets %llx", |
| e28acfea CB |
79 | vcpu->run->s390_reset_flags); |
| 80 | return -EREMOTE; | |
| 81 | } | |
| 82 | ||
| 83 | int kvm_s390_handle_diag(struct kvm_vcpu *vcpu) | |
| 84 | { | |
| 85 | int code = (vcpu->arch.sie_block->ipb & 0xfff0000) >> 16; | |
| 86 | ||
| 87 | switch (code) { | |
| 388186bc CB |
88 | case 0x10: |
| 89 | return diag_release_pages(vcpu); | |
| e28acfea CB |
90 | case 0x44: |
| 91 | return __diag_time_slice_end(vcpu); | |
| 92 | case 0x308: | |
| 93 | return __diag_ipl_functions(vcpu); | |
| 94 | default: | |
| b8e660b8 | 95 | return -EOPNOTSUPP; |
| e28acfea CB |
96 | } |
| 97 | } |