Commit | Line | Data |
---|---|---|
e28acfea | 1 | /* |
a53c8fab | 2 | * handling diagnose instructions |
e28acfea | 3 | * |
a53c8fab | 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> | |
deedabb2 | 16 | #include <asm/pgalloc.h> |
10ccaa1e | 17 | #include <asm/virtio-ccw.h> |
e28acfea | 18 | #include "kvm-s390.h" |
5786fffa | 19 | #include "trace.h" |
ade38c31 | 20 | #include "trace-s390.h" |
3c038e6b | 21 | #include "gaccess.h" |
e28acfea | 22 | |
388186bc CB |
23 | static int diag_release_pages(struct kvm_vcpu *vcpu) |
24 | { | |
25 | unsigned long start, end; | |
fda902cb | 26 | unsigned long prefix = kvm_s390_get_prefix(vcpu); |
388186bc | 27 | |
5a32c1af CB |
28 | start = vcpu->run->s.regs.gprs[(vcpu->arch.sie_block->ipa & 0xf0) >> 4]; |
29 | end = vcpu->run->s.regs.gprs[vcpu->arch.sie_block->ipa & 0xf] + 4096; | |
388186bc CB |
30 | |
31 | if (start & ~PAGE_MASK || end & ~PAGE_MASK || start > end | |
32 | || start < 2 * PAGE_SIZE) | |
33 | return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); | |
34 | ||
35 | VCPU_EVENT(vcpu, 5, "diag release pages %lX %lX", start, end); | |
36 | vcpu->stat.diagnose_10++; | |
37 | ||
38 | /* we checked for start > end above */ | |
39 | if (end < prefix || start >= prefix + 2 * PAGE_SIZE) { | |
40 | gmap_discard(start, end, vcpu->arch.gmap); | |
41 | } else { | |
42 | if (start < prefix) | |
43 | gmap_discard(start, prefix, vcpu->arch.gmap); | |
44 | if (end >= prefix) | |
45 | gmap_discard(prefix + 2 * PAGE_SIZE, | |
46 | end, vcpu->arch.gmap); | |
47 | } | |
48 | return 0; | |
49 | } | |
50 | ||
3c038e6b DD |
51 | static int __diag_page_ref_service(struct kvm_vcpu *vcpu) |
52 | { | |
53 | struct prs_parm { | |
54 | u16 code; | |
55 | u16 subcode; | |
56 | u16 parm_len; | |
57 | u16 parm_version; | |
58 | u64 token_addr; | |
59 | u64 select_mask; | |
60 | u64 compare_mask; | |
61 | u64 zarch; | |
62 | }; | |
63 | struct prs_parm parm; | |
64 | int rc; | |
65 | u16 rx = (vcpu->arch.sie_block->ipa & 0xf0) >> 4; | |
66 | u16 ry = (vcpu->arch.sie_block->ipa & 0x0f); | |
3c038e6b DD |
67 | |
68 | if (vcpu->run->s.regs.gprs[rx] & 7) | |
69 | return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); | |
81480cc1 HC |
70 | rc = read_guest(vcpu, vcpu->run->s.regs.gprs[rx], &parm, sizeof(parm)); |
71 | if (rc) | |
72 | return kvm_s390_inject_prog_cond(vcpu, rc); | |
3c038e6b DD |
73 | if (parm.parm_version != 2 || parm.parm_len < 5 || parm.code != 0x258) |
74 | return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); | |
75 | ||
76 | switch (parm.subcode) { | |
77 | case 0: /* TOKEN */ | |
78 | if (vcpu->arch.pfault_token != KVM_S390_PFAULT_TOKEN_INVALID) { | |
79 | /* | |
80 | * If the pagefault handshake is already activated, | |
81 | * the token must not be changed. We have to return | |
82 | * decimal 8 instead, as mandated in SC24-6084. | |
83 | */ | |
84 | vcpu->run->s.regs.gprs[ry] = 8; | |
85 | return 0; | |
86 | } | |
87 | ||
88 | if ((parm.compare_mask & parm.select_mask) != parm.compare_mask || | |
89 | parm.token_addr & 7 || parm.zarch != 0x8000000000000000ULL) | |
90 | return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); | |
91 | ||
81480cc1 | 92 | if (kvm_is_error_gpa(vcpu->kvm, parm.token_addr)) |
3c038e6b DD |
93 | return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); |
94 | ||
95 | vcpu->arch.pfault_token = parm.token_addr; | |
96 | vcpu->arch.pfault_select = parm.select_mask; | |
97 | vcpu->arch.pfault_compare = parm.compare_mask; | |
98 | vcpu->run->s.regs.gprs[ry] = 0; | |
99 | rc = 0; | |
100 | break; | |
101 | case 1: /* | |
102 | * CANCEL | |
103 | * Specification allows to let already pending tokens survive | |
104 | * the cancel, therefore to reduce code complexity, we assume | |
105 | * all outstanding tokens are already pending. | |
106 | */ | |
107 | if (parm.token_addr || parm.select_mask || | |
108 | parm.compare_mask || parm.zarch) | |
109 | return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); | |
110 | ||
111 | vcpu->run->s.regs.gprs[ry] = 0; | |
112 | /* | |
113 | * If the pfault handling was not established or is already | |
114 | * canceled SC24-6084 requests to return decimal 4. | |
115 | */ | |
116 | if (vcpu->arch.pfault_token == KVM_S390_PFAULT_TOKEN_INVALID) | |
117 | vcpu->run->s.regs.gprs[ry] = 4; | |
118 | else | |
119 | vcpu->arch.pfault_token = KVM_S390_PFAULT_TOKEN_INVALID; | |
120 | ||
121 | rc = 0; | |
122 | break; | |
123 | default: | |
124 | rc = -EOPNOTSUPP; | |
125 | break; | |
126 | } | |
127 | ||
128 | return rc; | |
129 | } | |
130 | ||
e28acfea CB |
131 | static int __diag_time_slice_end(struct kvm_vcpu *vcpu) |
132 | { | |
133 | VCPU_EVENT(vcpu, 5, "%s", "diag time slice end"); | |
134 | vcpu->stat.diagnose_44++; | |
8733ac36 | 135 | kvm_vcpu_on_spin(vcpu); |
e28acfea CB |
136 | return 0; |
137 | } | |
138 | ||
41628d33 KW |
139 | static int __diag_time_slice_end_directed(struct kvm_vcpu *vcpu) |
140 | { | |
141 | struct kvm *kvm = vcpu->kvm; | |
142 | struct kvm_vcpu *tcpu; | |
143 | int tid; | |
144 | int i; | |
145 | ||
146 | tid = vcpu->run->s.regs.gprs[(vcpu->arch.sie_block->ipa & 0xf0) >> 4]; | |
147 | vcpu->stat.diagnose_9c++; | |
148 | VCPU_EVENT(vcpu, 5, "diag time slice end directed to %d", tid); | |
149 | ||
150 | if (tid == vcpu->vcpu_id) | |
151 | return 0; | |
152 | ||
153 | kvm_for_each_vcpu(i, tcpu, kvm) | |
154 | if (tcpu->vcpu_id == tid) { | |
155 | kvm_vcpu_yield_to(tcpu); | |
156 | break; | |
157 | } | |
158 | ||
159 | return 0; | |
160 | } | |
161 | ||
e28acfea CB |
162 | static int __diag_ipl_functions(struct kvm_vcpu *vcpu) |
163 | { | |
164 | unsigned int reg = vcpu->arch.sie_block->ipa & 0xf; | |
5a32c1af | 165 | unsigned long subcode = vcpu->run->s.regs.gprs[reg] & 0xffff; |
e28acfea CB |
166 | |
167 | VCPU_EVENT(vcpu, 5, "diag ipl functions, subcode %lx", subcode); | |
168 | switch (subcode) { | |
169 | case 3: | |
170 | vcpu->run->s390_reset_flags = KVM_S390_RESET_CLEAR; | |
171 | break; | |
172 | case 4: | |
173 | vcpu->run->s390_reset_flags = 0; | |
174 | break; | |
175 | default: | |
b8e660b8 | 176 | return -EOPNOTSUPP; |
e28acfea CB |
177 | } |
178 | ||
6352e4d2 DH |
179 | if (!kvm_s390_user_cpu_state_ctrl(vcpu->kvm)) |
180 | kvm_s390_vcpu_stop(vcpu); | |
e28acfea CB |
181 | vcpu->run->s390_reset_flags |= KVM_S390_RESET_SUBSYSTEM; |
182 | vcpu->run->s390_reset_flags |= KVM_S390_RESET_IPL; | |
183 | vcpu->run->s390_reset_flags |= KVM_S390_RESET_CPU_INIT; | |
184 | vcpu->run->exit_reason = KVM_EXIT_S390_RESET; | |
33e19115 | 185 | VCPU_EVENT(vcpu, 3, "requesting userspace resets %llx", |
e28acfea | 186 | vcpu->run->s390_reset_flags); |
ade38c31 | 187 | trace_kvm_s390_request_resets(vcpu->run->s390_reset_flags); |
e28acfea CB |
188 | return -EREMOTE; |
189 | } | |
190 | ||
10ccaa1e CH |
191 | static int __diag_virtio_hypercall(struct kvm_vcpu *vcpu) |
192 | { | |
800c1065 | 193 | int ret; |
10ccaa1e CH |
194 | |
195 | /* No virtio-ccw notification? Get out quickly. */ | |
196 | if (!vcpu->kvm->arch.css_support || | |
197 | (vcpu->run->s.regs.gprs[1] != KVM_S390_VIRTIO_CCW_NOTIFY)) | |
198 | return -EOPNOTSUPP; | |
199 | ||
10ccaa1e CH |
200 | /* |
201 | * The layout is as follows: | |
202 | * - gpr 2 contains the subchannel id (passed as addr) | |
203 | * - gpr 3 contains the virtqueue index (passed as datamatch) | |
85dfe87e | 204 | * - gpr 4 contains the index on the bus (optionally) |
10ccaa1e | 205 | */ |
85dfe87e | 206 | ret = kvm_io_bus_write_cookie(vcpu->kvm, KVM_VIRTIO_CCW_NOTIFY_BUS, |
ff1f3cb4 | 207 | vcpu->run->s.regs.gprs[2] & 0xffffffff, |
85dfe87e CH |
208 | 8, &vcpu->run->s.regs.gprs[3], |
209 | vcpu->run->s.regs.gprs[4]); | |
85dfe87e CH |
210 | |
211 | /* | |
212 | * Return cookie in gpr 2, but don't overwrite the register if the | |
213 | * diagnose will be handled by userspace. | |
214 | */ | |
215 | if (ret != -EOPNOTSUPP) | |
216 | vcpu->run->s.regs.gprs[2] = ret; | |
217 | /* kvm_io_bus_write_cookie returns -EOPNOTSUPP if it found no match. */ | |
10ccaa1e CH |
218 | return ret < 0 ? ret : 0; |
219 | } | |
220 | ||
e28acfea CB |
221 | int kvm_s390_handle_diag(struct kvm_vcpu *vcpu) |
222 | { | |
743db27c | 223 | int code = kvm_s390_get_base_disp_rs(vcpu) & 0xffff; |
e28acfea | 224 | |
93e1750f TH |
225 | if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) |
226 | return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); | |
227 | ||
5786fffa | 228 | trace_kvm_s390_handle_diag(vcpu, code); |
e28acfea | 229 | switch (code) { |
388186bc CB |
230 | case 0x10: |
231 | return diag_release_pages(vcpu); | |
e28acfea CB |
232 | case 0x44: |
233 | return __diag_time_slice_end(vcpu); | |
41628d33 KW |
234 | case 0x9c: |
235 | return __diag_time_slice_end_directed(vcpu); | |
3c038e6b DD |
236 | case 0x258: |
237 | return __diag_page_ref_service(vcpu); | |
e28acfea CB |
238 | case 0x308: |
239 | return __diag_ipl_functions(vcpu); | |
10ccaa1e CH |
240 | case 0x500: |
241 | return __diag_virtio_hypercall(vcpu); | |
e28acfea | 242 | default: |
b8e660b8 | 243 | return -EOPNOTSUPP; |
e28acfea CB |
244 | } |
245 | } |