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
handle_lctlg(struct kvm_vcpu * vcpu)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 if (useraddr & 7)
42 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
43
44 reg = reg1;
45
46 VCPU_EVENT(vcpu, 5, "lctlg r1:%x, r3:%x,b2:%x,d2:%x", reg1, reg3, base2,
47 disp2);
48
49 do {
50 rc = get_guest_u64(vcpu, useraddr,
51 &vcpu->arch.sie_block->gcr[reg]);
52 if (rc == -EFAULT) {
53 kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
54 break;
55 }
56 useraddr += 8;
57 if (reg == reg3)
58 break;
59 reg = (reg + 1) % 16;
60 } while (1);
61 return 0;
62 }
63
handle_lctl(struct kvm_vcpu * vcpu)64 static int handle_lctl(struct kvm_vcpu *vcpu)
65 {
66 int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
67 int reg3 = vcpu->arch.sie_block->ipa & 0x000f;
68 int base2 = vcpu->arch.sie_block->ipb >> 28;
69 int disp2 = ((vcpu->arch.sie_block->ipb & 0x0fff0000) >> 16);
70 u64 useraddr;
71 u32 val = 0;
72 int reg, rc;
73
74 vcpu->stat.instruction_lctl++;
75
76 useraddr = disp2;
77 if (base2)
78 useraddr += vcpu->arch.guest_gprs[base2];
79
80 if (useraddr & 3)
81 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
82
83 VCPU_EVENT(vcpu, 5, "lctl r1:%x, r3:%x,b2:%x,d2:%x", reg1, reg3, base2,
84 disp2);
85
86 reg = reg1;
87 do {
88 rc = get_guest_u32(vcpu, useraddr, &val);
89 if (rc == -EFAULT) {
90 kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
91 break;
92 }
93 vcpu->arch.sie_block->gcr[reg] &= 0xffffffff00000000ul;
94 vcpu->arch.sie_block->gcr[reg] |= val;
95 useraddr += 4;
96 if (reg == reg3)
97 break;
98 reg = (reg + 1) % 16;
99 } while (1);
100 return 0;
101 }
102
103 static intercept_handler_t instruction_handlers[256] = {
104 [0x83] = kvm_s390_handle_diag,
105 [0xae] = kvm_s390_handle_sigp,
106 [0xb2] = kvm_s390_handle_priv,
107 [0xb7] = handle_lctl,
108 [0xeb] = handle_lctlg,
109 };
110
handle_noop(struct kvm_vcpu * vcpu)111 static int handle_noop(struct kvm_vcpu *vcpu)
112 {
113 switch (vcpu->arch.sie_block->icptcode) {
114 case 0x0:
115 vcpu->stat.exit_null++;
116 break;
117 case 0x10:
118 vcpu->stat.exit_external_request++;
119 break;
120 case 0x14:
121 vcpu->stat.exit_external_interrupt++;
122 break;
123 default:
124 break; /* nothing */
125 }
126 return 0;
127 }
128
handle_stop(struct kvm_vcpu * vcpu)129 static int handle_stop(struct kvm_vcpu *vcpu)
130 {
131 int rc;
132
133 vcpu->stat.exit_stop_request++;
134 atomic_clear_mask(CPUSTAT_RUNNING, &vcpu->arch.sie_block->cpuflags);
135 spin_lock_bh(&vcpu->arch.local_int.lock);
136 if (vcpu->arch.local_int.action_bits & ACTION_STORE_ON_STOP) {
137 vcpu->arch.local_int.action_bits &= ~ACTION_STORE_ON_STOP;
138 rc = __kvm_s390_vcpu_store_status(vcpu,
139 KVM_S390_STORE_STATUS_NOADDR);
140 if (rc >= 0)
141 rc = -ENOTSUPP;
142 }
143
144 if (vcpu->arch.local_int.action_bits & ACTION_STOP_ON_STOP) {
145 vcpu->arch.local_int.action_bits &= ~ACTION_STOP_ON_STOP;
146 VCPU_EVENT(vcpu, 3, "%s", "cpu stopped");
147 rc = -ENOTSUPP;
148 } else
149 rc = 0;
150 spin_unlock_bh(&vcpu->arch.local_int.lock);
151 return rc;
152 }
153
handle_validity(struct kvm_vcpu * vcpu)154 static int handle_validity(struct kvm_vcpu *vcpu)
155 {
156 int viwhy = vcpu->arch.sie_block->ipb >> 16;
157 vcpu->stat.exit_validity++;
158 if (viwhy == 0x37) {
159 fault_in_pages_writeable((char __user *)
160 vcpu->kvm->arch.guest_origin +
161 vcpu->arch.sie_block->prefix,
162 PAGE_SIZE);
163 return 0;
164 }
165 VCPU_EVENT(vcpu, 2, "unhandled validity intercept code %d",
166 viwhy);
167 return -ENOTSUPP;
168 }
169
handle_instruction(struct kvm_vcpu * vcpu)170 static int handle_instruction(struct kvm_vcpu *vcpu)
171 {
172 intercept_handler_t handler;
173
174 vcpu->stat.exit_instruction++;
175 handler = instruction_handlers[vcpu->arch.sie_block->ipa >> 8];
176 if (handler)
177 return handler(vcpu);
178 return -ENOTSUPP;
179 }
180
handle_prog(struct kvm_vcpu * vcpu)181 static int handle_prog(struct kvm_vcpu *vcpu)
182 {
183 vcpu->stat.exit_program_interruption++;
184 return kvm_s390_inject_program_int(vcpu, vcpu->arch.sie_block->iprcc);
185 }
186
handle_instruction_and_prog(struct kvm_vcpu * vcpu)187 static int handle_instruction_and_prog(struct kvm_vcpu *vcpu)
188 {
189 int rc, rc2;
190
191 vcpu->stat.exit_instr_and_program++;
192 rc = handle_instruction(vcpu);
193 rc2 = handle_prog(vcpu);
194
195 if (rc == -ENOTSUPP)
196 vcpu->arch.sie_block->icptcode = 0x04;
197 if (rc)
198 return rc;
199 return rc2;
200 }
201
202 static const intercept_handler_t intercept_funcs[0x48 >> 2] = {
203 [0x00 >> 2] = handle_noop,
204 [0x04 >> 2] = handle_instruction,
205 [0x08 >> 2] = handle_prog,
206 [0x0C >> 2] = handle_instruction_and_prog,
207 [0x10 >> 2] = handle_noop,
208 [0x14 >> 2] = handle_noop,
209 [0x1C >> 2] = kvm_s390_handle_wait,
210 [0x20 >> 2] = handle_validity,
211 [0x28 >> 2] = handle_stop,
212 };
213
kvm_handle_sie_intercept(struct kvm_vcpu * vcpu)214 int kvm_handle_sie_intercept(struct kvm_vcpu *vcpu)
215 {
216 intercept_handler_t func;
217 u8 code = vcpu->arch.sie_block->icptcode;
218
219 if (code & 3 || code > 0x48)
220 return -ENOTSUPP;
221 func = intercept_funcs[code >> 2];
222 if (func)
223 return func(vcpu);
224 return -ENOTSUPP;
225 }
226