Commit | Line | Data |
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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> |
1e133ab2 | 17 | #include <asm/gmap.h> |
10ccaa1e | 18 | #include <asm/virtio-ccw.h> |
e28acfea | 19 | #include "kvm-s390.h" |
5786fffa | 20 | #include "trace.h" |
ade38c31 | 21 | #include "trace-s390.h" |
3c038e6b | 22 | #include "gaccess.h" |
e28acfea | 23 | |
388186bc CB |
24 | static int diag_release_pages(struct kvm_vcpu *vcpu) |
25 | { | |
26 | unsigned long start, end; | |
fda902cb | 27 | unsigned long prefix = kvm_s390_get_prefix(vcpu); |
388186bc | 28 | |
5a32c1af CB |
29 | start = vcpu->run->s.regs.gprs[(vcpu->arch.sie_block->ipa & 0xf0) >> 4]; |
30 | end = vcpu->run->s.regs.gprs[vcpu->arch.sie_block->ipa & 0xf] + 4096; | |
175a5c9e | 31 | vcpu->stat.diagnose_10++; |
388186bc | 32 | |
f7a960af | 33 | if (start & ~PAGE_MASK || end & ~PAGE_MASK || start >= end |
388186bc CB |
34 | || start < 2 * PAGE_SIZE) |
35 | return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); | |
36 | ||
37 | VCPU_EVENT(vcpu, 5, "diag release pages %lX %lX", start, end); | |
388186bc | 38 | |
f7a960af CB |
39 | /* |
40 | * We checked for start >= end above, so lets check for the | |
41 | * fast path (no prefix swap page involved) | |
42 | */ | |
43 | if (end <= prefix || start >= prefix + 2 * PAGE_SIZE) { | |
6e0a0431 | 44 | gmap_discard(vcpu->arch.gmap, start, end); |
388186bc | 45 | } else { |
f7a960af CB |
46 | /* |
47 | * This is slow path. gmap_discard will check for start | |
48 | * so lets split this into before prefix, prefix, after | |
49 | * prefix and let gmap_discard make some of these calls | |
50 | * NOPs. | |
51 | */ | |
52 | gmap_discard(vcpu->arch.gmap, start, prefix); | |
53 | if (start <= prefix) | |
54 | gmap_discard(vcpu->arch.gmap, 0, 4096); | |
55 | if (end > prefix + 4096) | |
56 | gmap_discard(vcpu->arch.gmap, 4096, 8192); | |
57 | gmap_discard(vcpu->arch.gmap, prefix + 2 * PAGE_SIZE, end); | |
388186bc CB |
58 | } |
59 | return 0; | |
60 | } | |
61 | ||
3c038e6b DD |
62 | static int __diag_page_ref_service(struct kvm_vcpu *vcpu) |
63 | { | |
64 | struct prs_parm { | |
65 | u16 code; | |
66 | u16 subcode; | |
67 | u16 parm_len; | |
68 | u16 parm_version; | |
69 | u64 token_addr; | |
70 | u64 select_mask; | |
71 | u64 compare_mask; | |
72 | u64 zarch; | |
73 | }; | |
74 | struct prs_parm parm; | |
75 | int rc; | |
76 | u16 rx = (vcpu->arch.sie_block->ipa & 0xf0) >> 4; | |
77 | u16 ry = (vcpu->arch.sie_block->ipa & 0x0f); | |
3c038e6b | 78 | |
15e8b5da CB |
79 | VCPU_EVENT(vcpu, 3, "diag page reference parameter block at 0x%llx", |
80 | vcpu->run->s.regs.gprs[rx]); | |
175a5c9e | 81 | vcpu->stat.diagnose_258++; |
3c038e6b DD |
82 | if (vcpu->run->s.regs.gprs[rx] & 7) |
83 | return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); | |
8ae04b8f | 84 | rc = read_guest(vcpu, vcpu->run->s.regs.gprs[rx], rx, &parm, sizeof(parm)); |
81480cc1 HC |
85 | if (rc) |
86 | return kvm_s390_inject_prog_cond(vcpu, rc); | |
3c038e6b DD |
87 | if (parm.parm_version != 2 || parm.parm_len < 5 || parm.code != 0x258) |
88 | return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); | |
89 | ||
90 | switch (parm.subcode) { | |
91 | case 0: /* TOKEN */ | |
ab7090a6 CB |
92 | VCPU_EVENT(vcpu, 3, "pageref token addr 0x%llx " |
93 | "select mask 0x%llx compare mask 0x%llx", | |
94 | parm.token_addr, parm.select_mask, parm.compare_mask); | |
3c038e6b DD |
95 | if (vcpu->arch.pfault_token != KVM_S390_PFAULT_TOKEN_INVALID) { |
96 | /* | |
97 | * If the pagefault handshake is already activated, | |
98 | * the token must not be changed. We have to return | |
99 | * decimal 8 instead, as mandated in SC24-6084. | |
100 | */ | |
101 | vcpu->run->s.regs.gprs[ry] = 8; | |
102 | return 0; | |
103 | } | |
104 | ||
105 | if ((parm.compare_mask & parm.select_mask) != parm.compare_mask || | |
106 | parm.token_addr & 7 || parm.zarch != 0x8000000000000000ULL) | |
107 | return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); | |
108 | ||
81480cc1 | 109 | if (kvm_is_error_gpa(vcpu->kvm, parm.token_addr)) |
3c038e6b DD |
110 | return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); |
111 | ||
112 | vcpu->arch.pfault_token = parm.token_addr; | |
113 | vcpu->arch.pfault_select = parm.select_mask; | |
114 | vcpu->arch.pfault_compare = parm.compare_mask; | |
115 | vcpu->run->s.regs.gprs[ry] = 0; | |
116 | rc = 0; | |
117 | break; | |
118 | case 1: /* | |
119 | * CANCEL | |
120 | * Specification allows to let already pending tokens survive | |
121 | * the cancel, therefore to reduce code complexity, we assume | |
122 | * all outstanding tokens are already pending. | |
123 | */ | |
ab7090a6 | 124 | VCPU_EVENT(vcpu, 3, "pageref cancel addr 0x%llx", parm.token_addr); |
3c038e6b DD |
125 | if (parm.token_addr || parm.select_mask || |
126 | parm.compare_mask || parm.zarch) | |
127 | return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); | |
128 | ||
129 | vcpu->run->s.regs.gprs[ry] = 0; | |
130 | /* | |
131 | * If the pfault handling was not established or is already | |
132 | * canceled SC24-6084 requests to return decimal 4. | |
133 | */ | |
134 | if (vcpu->arch.pfault_token == KVM_S390_PFAULT_TOKEN_INVALID) | |
135 | vcpu->run->s.regs.gprs[ry] = 4; | |
136 | else | |
137 | vcpu->arch.pfault_token = KVM_S390_PFAULT_TOKEN_INVALID; | |
138 | ||
139 | rc = 0; | |
140 | break; | |
141 | default: | |
142 | rc = -EOPNOTSUPP; | |
143 | break; | |
144 | } | |
145 | ||
146 | return rc; | |
147 | } | |
148 | ||
e28acfea CB |
149 | static int __diag_time_slice_end(struct kvm_vcpu *vcpu) |
150 | { | |
151 | VCPU_EVENT(vcpu, 5, "%s", "diag time slice end"); | |
152 | vcpu->stat.diagnose_44++; | |
8733ac36 | 153 | kvm_vcpu_on_spin(vcpu); |
e28acfea CB |
154 | return 0; |
155 | } | |
156 | ||
41628d33 KW |
157 | static int __diag_time_slice_end_directed(struct kvm_vcpu *vcpu) |
158 | { | |
41628d33 KW |
159 | struct kvm_vcpu *tcpu; |
160 | int tid; | |
41628d33 KW |
161 | |
162 | tid = vcpu->run->s.regs.gprs[(vcpu->arch.sie_block->ipa & 0xf0) >> 4]; | |
163 | vcpu->stat.diagnose_9c++; | |
164 | VCPU_EVENT(vcpu, 5, "diag time slice end directed to %d", tid); | |
165 | ||
166 | if (tid == vcpu->vcpu_id) | |
167 | return 0; | |
168 | ||
e09fefde DH |
169 | tcpu = kvm_get_vcpu_by_id(vcpu->kvm, tid); |
170 | if (tcpu) | |
171 | kvm_vcpu_yield_to(tcpu); | |
41628d33 KW |
172 | return 0; |
173 | } | |
174 | ||
e28acfea CB |
175 | static int __diag_ipl_functions(struct kvm_vcpu *vcpu) |
176 | { | |
177 | unsigned int reg = vcpu->arch.sie_block->ipa & 0xf; | |
5a32c1af | 178 | unsigned long subcode = vcpu->run->s.regs.gprs[reg] & 0xffff; |
e28acfea | 179 | |
15e8b5da | 180 | VCPU_EVENT(vcpu, 3, "diag ipl functions, subcode %lx", subcode); |
175a5c9e | 181 | vcpu->stat.diagnose_308++; |
e28acfea CB |
182 | switch (subcode) { |
183 | case 3: | |
184 | vcpu->run->s390_reset_flags = KVM_S390_RESET_CLEAR; | |
185 | break; | |
186 | case 4: | |
187 | vcpu->run->s390_reset_flags = 0; | |
188 | break; | |
189 | default: | |
b8e660b8 | 190 | return -EOPNOTSUPP; |
e28acfea CB |
191 | } |
192 | ||
6352e4d2 DH |
193 | if (!kvm_s390_user_cpu_state_ctrl(vcpu->kvm)) |
194 | kvm_s390_vcpu_stop(vcpu); | |
e28acfea CB |
195 | vcpu->run->s390_reset_flags |= KVM_S390_RESET_SUBSYSTEM; |
196 | vcpu->run->s390_reset_flags |= KVM_S390_RESET_IPL; | |
197 | vcpu->run->s390_reset_flags |= KVM_S390_RESET_CPU_INIT; | |
198 | vcpu->run->exit_reason = KVM_EXIT_S390_RESET; | |
33e19115 | 199 | VCPU_EVENT(vcpu, 3, "requesting userspace resets %llx", |
e28acfea | 200 | vcpu->run->s390_reset_flags); |
ade38c31 | 201 | trace_kvm_s390_request_resets(vcpu->run->s390_reset_flags); |
e28acfea CB |
202 | return -EREMOTE; |
203 | } | |
204 | ||
10ccaa1e CH |
205 | static int __diag_virtio_hypercall(struct kvm_vcpu *vcpu) |
206 | { | |
800c1065 | 207 | int ret; |
10ccaa1e | 208 | |
175a5c9e | 209 | vcpu->stat.diagnose_500++; |
10ccaa1e CH |
210 | /* No virtio-ccw notification? Get out quickly. */ |
211 | if (!vcpu->kvm->arch.css_support || | |
212 | (vcpu->run->s.regs.gprs[1] != KVM_S390_VIRTIO_CCW_NOTIFY)) | |
213 | return -EOPNOTSUPP; | |
214 | ||
10ccaa1e CH |
215 | /* |
216 | * The layout is as follows: | |
217 | * - gpr 2 contains the subchannel id (passed as addr) | |
218 | * - gpr 3 contains the virtqueue index (passed as datamatch) | |
85dfe87e | 219 | * - gpr 4 contains the index on the bus (optionally) |
10ccaa1e | 220 | */ |
e32edf4f | 221 | ret = kvm_io_bus_write_cookie(vcpu, KVM_VIRTIO_CCW_NOTIFY_BUS, |
ff1f3cb4 | 222 | vcpu->run->s.regs.gprs[2] & 0xffffffff, |
85dfe87e CH |
223 | 8, &vcpu->run->s.regs.gprs[3], |
224 | vcpu->run->s.regs.gprs[4]); | |
85dfe87e CH |
225 | |
226 | /* | |
227 | * Return cookie in gpr 2, but don't overwrite the register if the | |
228 | * diagnose will be handled by userspace. | |
229 | */ | |
230 | if (ret != -EOPNOTSUPP) | |
231 | vcpu->run->s.regs.gprs[2] = ret; | |
232 | /* kvm_io_bus_write_cookie returns -EOPNOTSUPP if it found no match. */ | |
10ccaa1e CH |
233 | return ret < 0 ? ret : 0; |
234 | } | |
235 | ||
e28acfea CB |
236 | int kvm_s390_handle_diag(struct kvm_vcpu *vcpu) |
237 | { | |
8ae04b8f | 238 | int code = kvm_s390_get_base_disp_rs(vcpu, NULL) & 0xffff; |
e28acfea | 239 | |
93e1750f TH |
240 | if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) |
241 | return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); | |
242 | ||
5786fffa | 243 | trace_kvm_s390_handle_diag(vcpu, code); |
e28acfea | 244 | switch (code) { |
388186bc CB |
245 | case 0x10: |
246 | return diag_release_pages(vcpu); | |
e28acfea CB |
247 | case 0x44: |
248 | return __diag_time_slice_end(vcpu); | |
41628d33 KW |
249 | case 0x9c: |
250 | return __diag_time_slice_end_directed(vcpu); | |
3c038e6b DD |
251 | case 0x258: |
252 | return __diag_page_ref_service(vcpu); | |
e28acfea CB |
253 | case 0x308: |
254 | return __diag_ipl_functions(vcpu); | |
10ccaa1e CH |
255 | case 0x500: |
256 | return __diag_virtio_hypercall(vcpu); | |
e28acfea | 257 | default: |
b8e660b8 | 258 | return -EOPNOTSUPP; |
e28acfea CB |
259 | } |
260 | } |