KVM: s390: Fix instruction naming for lctlg
[linux-2.6.git] / arch / s390 / kvm / intercept.c
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"
21 #include "gaccess.h"
22
23 static int handle_lctlg(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_lctlg++;
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, "lctlg 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] = {
98         [0x83] = kvm_s390_handle_diag,
99         [0xae] = kvm_s390_handle_sigp,
100         [0xb2] = kvm_s390_handle_priv,
101         [0xb7] = handle_lctl,
102         [0xeb] = handle_lctlg,
103 };
104
105 static int handle_noop(struct kvm_vcpu *vcpu)
106 {
107         switch (vcpu->arch.sie_block->icptcode) {
108         case 0x0:
109                 vcpu->stat.exit_null++;
110                 break;
111         case 0x10:
112                 vcpu->stat.exit_external_request++;
113                 break;
114         case 0x14:
115                 vcpu->stat.exit_external_interrupt++;
116                 break;
117         default:
118                 break; /* nothing */
119         }
120         return 0;
121 }
122
123 static int handle_stop(struct kvm_vcpu *vcpu)
124 {
125         int rc;
126
127         vcpu->stat.exit_stop_request++;
128         atomic_clear_mask(CPUSTAT_RUNNING, &vcpu->arch.sie_block->cpuflags);
129         spin_lock_bh(&vcpu->arch.local_int.lock);
130         if (vcpu->arch.local_int.action_bits & ACTION_STORE_ON_STOP) {
131                 vcpu->arch.local_int.action_bits &= ~ACTION_STORE_ON_STOP;
132                 rc = __kvm_s390_vcpu_store_status(vcpu,
133                                                   KVM_S390_STORE_STATUS_NOADDR);
134                 if (rc >= 0)
135                         rc = -ENOTSUPP;
136         }
137
138         if (vcpu->arch.local_int.action_bits & ACTION_STOP_ON_STOP) {
139                 vcpu->arch.local_int.action_bits &= ~ACTION_STOP_ON_STOP;
140                 VCPU_EVENT(vcpu, 3, "%s", "cpu stopped");
141                 rc = -ENOTSUPP;
142         } else
143                 rc = 0;
144         spin_unlock_bh(&vcpu->arch.local_int.lock);
145         return rc;
146 }
147
148 static int handle_validity(struct kvm_vcpu *vcpu)
149 {
150         int viwhy = vcpu->arch.sie_block->ipb >> 16;
151         vcpu->stat.exit_validity++;
152         if (viwhy == 0x37) {
153                 fault_in_pages_writeable((char __user *)
154                                          vcpu->kvm->arch.guest_origin +
155                                          vcpu->arch.sie_block->prefix,
156                                          PAGE_SIZE);
157                 return 0;
158         }
159         VCPU_EVENT(vcpu, 2, "unhandled validity intercept code %d",
160                    viwhy);
161         return -ENOTSUPP;
162 }
163
164 static int handle_instruction(struct kvm_vcpu *vcpu)
165 {
166         intercept_handler_t handler;
167
168         vcpu->stat.exit_instruction++;
169         handler = instruction_handlers[vcpu->arch.sie_block->ipa >> 8];
170         if (handler)
171                 return handler(vcpu);
172         return -ENOTSUPP;
173 }
174
175 static int handle_prog(struct kvm_vcpu *vcpu)
176 {
177         vcpu->stat.exit_program_interruption++;
178         return kvm_s390_inject_program_int(vcpu, vcpu->arch.sie_block->iprcc);
179 }
180
181 static int handle_instruction_and_prog(struct kvm_vcpu *vcpu)
182 {
183         int rc, rc2;
184
185         vcpu->stat.exit_instr_and_program++;
186         rc = handle_instruction(vcpu);
187         rc2 = handle_prog(vcpu);
188
189         if (rc == -ENOTSUPP)
190                 vcpu->arch.sie_block->icptcode = 0x04;
191         if (rc)
192                 return rc;
193         return rc2;
194 }
195
196 static const intercept_handler_t intercept_funcs[0x48 >> 2] = {
197         [0x00 >> 2] = handle_noop,
198         [0x04 >> 2] = handle_instruction,
199         [0x08 >> 2] = handle_prog,
200         [0x0C >> 2] = handle_instruction_and_prog,
201         [0x10 >> 2] = handle_noop,
202         [0x14 >> 2] = handle_noop,
203         [0x1C >> 2] = kvm_s390_handle_wait,
204         [0x20 >> 2] = handle_validity,
205         [0x28 >> 2] = handle_stop,
206 };
207
208 int kvm_handle_sie_intercept(struct kvm_vcpu *vcpu)
209 {
210         intercept_handler_t func;
211         u8 code = vcpu->arch.sie_block->icptcode;
212
213         if (code & 3 || code > 0x48)
214                 return -ENOTSUPP;
215         func = intercept_funcs[code >> 2];
216         if (func)
217                 return func(vcpu);
218         return -ENOTSUPP;
219 }