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8f2abe6a CB |
1 | /* |
2 | * intercept.c - in-kernel handling for sie intercepts | |
3 | * | |
4 | * Copyright IBM Corp. 2008 | |
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_host.h> | |
15 | #include <linux/errno.h> | |
16 | #include <linux/pagemap.h> | |
17 | ||
18 | #include <asm/kvm_host.h> | |
19 | ||
20 | #include "kvm-s390.h" | |
ba5c1e9b CO |
21 | #include "gaccess.h" |
22 | ||
23 | static int handle_lctg(struct kvm_vcpu *vcpu) | |
24 | { | |
25 | int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4; | |
26 | int reg3 = vcpu->arch.sie_block->ipa & 0x000f; | |
27 | int base2 = vcpu->arch.sie_block->ipb >> 28; | |
28 | int disp2 = ((vcpu->arch.sie_block->ipb & 0x0fff0000) >> 16) + | |
29 | ((vcpu->arch.sie_block->ipb & 0xff00) << 4); | |
30 | u64 useraddr; | |
31 | int reg, rc; | |
32 | ||
33 | vcpu->stat.instruction_lctg++; | |
34 | if ((vcpu->arch.sie_block->ipb & 0xff) != 0x2f) | |
35 | return -ENOTSUPP; | |
36 | ||
37 | useraddr = disp2; | |
38 | if (base2) | |
39 | useraddr += vcpu->arch.guest_gprs[base2]; | |
40 | ||
41 | reg = reg1; | |
42 | ||
43 | VCPU_EVENT(vcpu, 5, "lctg r1:%x, r3:%x,b2:%x,d2:%x", reg1, reg3, base2, | |
44 | disp2); | |
45 | ||
46 | do { | |
47 | rc = get_guest_u64(vcpu, useraddr, | |
48 | &vcpu->arch.sie_block->gcr[reg]); | |
49 | if (rc == -EFAULT) { | |
50 | kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); | |
51 | break; | |
52 | } | |
53 | useraddr += 8; | |
54 | if (reg == reg3) | |
55 | break; | |
56 | reg = (reg + 1) % 16; | |
57 | } while (1); | |
58 | return 0; | |
59 | } | |
60 | ||
61 | static int handle_lctl(struct kvm_vcpu *vcpu) | |
62 | { | |
63 | int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4; | |
64 | int reg3 = vcpu->arch.sie_block->ipa & 0x000f; | |
65 | int base2 = vcpu->arch.sie_block->ipb >> 28; | |
66 | int disp2 = ((vcpu->arch.sie_block->ipb & 0x0fff0000) >> 16); | |
67 | u64 useraddr; | |
68 | u32 val = 0; | |
69 | int reg, rc; | |
70 | ||
71 | vcpu->stat.instruction_lctl++; | |
72 | ||
73 | useraddr = disp2; | |
74 | if (base2) | |
75 | useraddr += vcpu->arch.guest_gprs[base2]; | |
76 | ||
77 | VCPU_EVENT(vcpu, 5, "lctl r1:%x, r3:%x,b2:%x,d2:%x", reg1, reg3, base2, | |
78 | disp2); | |
79 | ||
80 | reg = reg1; | |
81 | do { | |
82 | rc = get_guest_u32(vcpu, useraddr, &val); | |
83 | if (rc == -EFAULT) { | |
84 | kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); | |
85 | break; | |
86 | } | |
87 | vcpu->arch.sie_block->gcr[reg] &= 0xffffffff00000000ul; | |
88 | vcpu->arch.sie_block->gcr[reg] |= val; | |
89 | useraddr += 4; | |
90 | if (reg == reg3) | |
91 | break; | |
92 | reg = (reg + 1) % 16; | |
93 | } while (1); | |
94 | return 0; | |
95 | } | |
96 | ||
97 | static intercept_handler_t instruction_handlers[256] = { | |
5288fbf0 | 98 | [0xae] = kvm_s390_handle_sigp, |
453423dc | 99 | [0xb2] = kvm_s390_handle_priv, |
ba5c1e9b CO |
100 | [0xb7] = handle_lctl, |
101 | [0xeb] = handle_lctg, | |
102 | }; | |
8f2abe6a CB |
103 | |
104 | static int handle_noop(struct kvm_vcpu *vcpu) | |
105 | { | |
106 | switch (vcpu->arch.sie_block->icptcode) { | |
107 | case 0x10: | |
108 | vcpu->stat.exit_external_request++; | |
109 | break; | |
110 | case 0x14: | |
111 | vcpu->stat.exit_external_interrupt++; | |
112 | break; | |
113 | default: | |
114 | break; /* nothing */ | |
115 | } | |
116 | return 0; | |
117 | } | |
118 | ||
119 | static int handle_stop(struct kvm_vcpu *vcpu) | |
120 | { | |
5288fbf0 CB |
121 | int rc; |
122 | ||
8f2abe6a | 123 | vcpu->stat.exit_stop_request++; |
8f2abe6a | 124 | atomic_clear_mask(CPUSTAT_RUNNING, &vcpu->arch.sie_block->cpuflags); |
5288fbf0 CB |
125 | spin_lock_bh(&vcpu->arch.local_int.lock); |
126 | if (vcpu->arch.local_int.action_bits & ACTION_STORE_ON_STOP) { | |
127 | vcpu->arch.local_int.action_bits &= ~ACTION_STORE_ON_STOP; | |
128 | rc = __kvm_s390_vcpu_store_status(vcpu, | |
129 | KVM_S390_STORE_STATUS_NOADDR); | |
130 | if (rc >= 0) | |
131 | rc = -ENOTSUPP; | |
132 | } | |
133 | ||
134 | if (vcpu->arch.local_int.action_bits & ACTION_STOP_ON_STOP) { | |
135 | vcpu->arch.local_int.action_bits &= ~ACTION_STOP_ON_STOP; | |
136 | VCPU_EVENT(vcpu, 3, "%s", "cpu stopped"); | |
137 | rc = -ENOTSUPP; | |
138 | } else | |
139 | rc = 0; | |
140 | spin_unlock_bh(&vcpu->arch.local_int.lock); | |
141 | return rc; | |
8f2abe6a CB |
142 | } |
143 | ||
144 | static int handle_validity(struct kvm_vcpu *vcpu) | |
145 | { | |
146 | int viwhy = vcpu->arch.sie_block->ipb >> 16; | |
147 | vcpu->stat.exit_validity++; | |
148 | if (viwhy == 0x37) { | |
149 | fault_in_pages_writeable((char __user *) | |
150 | vcpu->kvm->arch.guest_origin + | |
151 | vcpu->arch.sie_block->prefix, | |
152 | PAGE_SIZE); | |
153 | return 0; | |
154 | } | |
155 | VCPU_EVENT(vcpu, 2, "unhandled validity intercept code %d", | |
156 | viwhy); | |
157 | return -ENOTSUPP; | |
158 | } | |
159 | ||
ba5c1e9b CO |
160 | static int handle_instruction(struct kvm_vcpu *vcpu) |
161 | { | |
162 | intercept_handler_t handler; | |
163 | ||
164 | vcpu->stat.exit_instruction++; | |
165 | handler = instruction_handlers[vcpu->arch.sie_block->ipa >> 8]; | |
166 | if (handler) | |
167 | return handler(vcpu); | |
168 | return -ENOTSUPP; | |
169 | } | |
170 | ||
171 | static int handle_prog(struct kvm_vcpu *vcpu) | |
172 | { | |
173 | vcpu->stat.exit_program_interruption++; | |
174 | return kvm_s390_inject_program_int(vcpu, vcpu->arch.sie_block->iprcc); | |
175 | } | |
176 | ||
177 | static int handle_instruction_and_prog(struct kvm_vcpu *vcpu) | |
178 | { | |
179 | int rc, rc2; | |
180 | ||
181 | vcpu->stat.exit_instr_and_program++; | |
182 | rc = handle_instruction(vcpu); | |
183 | rc2 = handle_prog(vcpu); | |
184 | ||
185 | if (rc == -ENOTSUPP) | |
186 | vcpu->arch.sie_block->icptcode = 0x04; | |
187 | if (rc) | |
188 | return rc; | |
189 | return rc2; | |
190 | } | |
191 | ||
8f2abe6a CB |
192 | static const intercept_handler_t intercept_funcs[0x48 >> 2] = { |
193 | [0x00 >> 2] = handle_noop, | |
ba5c1e9b CO |
194 | [0x04 >> 2] = handle_instruction, |
195 | [0x08 >> 2] = handle_prog, | |
196 | [0x0C >> 2] = handle_instruction_and_prog, | |
8f2abe6a CB |
197 | [0x10 >> 2] = handle_noop, |
198 | [0x14 >> 2] = handle_noop, | |
ba5c1e9b | 199 | [0x1C >> 2] = kvm_s390_handle_wait, |
8f2abe6a CB |
200 | [0x20 >> 2] = handle_validity, |
201 | [0x28 >> 2] = handle_stop, | |
202 | }; | |
203 | ||
204 | int kvm_handle_sie_intercept(struct kvm_vcpu *vcpu) | |
205 | { | |
206 | intercept_handler_t func; | |
207 | u8 code = vcpu->arch.sie_block->icptcode; | |
208 | ||
209 | if (code & 3 || code > 0x48) | |
210 | return -ENOTSUPP; | |
211 | func = intercept_funcs[code >> 2]; | |
212 | if (func) | |
213 | return func(vcpu); | |
214 | return -ENOTSUPP; | |
215 | } |