1 /*
2 * S390x DIAG instruction helper functions
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 */
14
15 #include "qemu/osdep.h"
16 #include "cpu.h"
17 #include "s390x-internal.h"
18 #include "hw/watchdog/wdt_diag288.h"
19 #include "sysemu/cpus.h"
20 #include "hw/s390x/ipl.h"
21 #include "hw/s390x/s390-virtio-ccw.h"
22 #include "sysemu/kvm.h"
23 #include "kvm/kvm_s390x.h"
24 #include "target/s390x/kvm/pv.h"
25 #include "qemu/error-report.h"
26
27
handle_diag_288(CPUS390XState * env,uint64_t r1,uint64_t r3)28 int handle_diag_288(CPUS390XState *env, uint64_t r1, uint64_t r3)
29 {
30 uint64_t func = env->regs[r1];
31 uint64_t timeout = env->regs[r1 + 1];
32 uint64_t action = env->regs[r3];
33 Object *obj;
34 DIAG288State *diag288;
35 DIAG288Class *diag288_class;
36
37 if (r1 % 2 || action != 0) {
38 return -1;
39 }
40
41 /* Timeout must be more than 15 seconds except for timer deletion */
42 if (func != WDT_DIAG288_CANCEL && timeout < 15) {
43 return -1;
44 }
45
46 obj = object_resolve_path_type("", TYPE_WDT_DIAG288, NULL);
47 if (!obj) {
48 return -1;
49 }
50
51 diag288 = DIAG288(obj);
52 diag288_class = DIAG288_GET_CLASS(diag288);
53 return diag288_class->handle_timer(diag288, func, timeout);
54 }
55
diag308_parm_check(CPUS390XState * env,uint64_t r1,uint64_t addr,uintptr_t ra,bool write)56 static int diag308_parm_check(CPUS390XState *env, uint64_t r1, uint64_t addr,
57 uintptr_t ra, bool write)
58 {
59 /* Handled by the Ultravisor */
60 if (s390_is_pv()) {
61 return 0;
62 }
63 if ((r1 & 1) || (addr & ~TARGET_PAGE_MASK)) {
64 s390_program_interrupt(env, PGM_SPECIFICATION, ra);
65 return -1;
66 }
67 if (!address_space_access_valid(&address_space_memory, addr,
68 sizeof(IplParameterBlock), write,
69 MEMTXATTRS_UNSPECIFIED)) {
70 s390_program_interrupt(env, PGM_ADDRESSING, ra);
71 return -1;
72 }
73 return 0;
74 }
75
handle_diag_308(CPUS390XState * env,uint64_t r1,uint64_t r3,uintptr_t ra)76 void handle_diag_308(CPUS390XState *env, uint64_t r1, uint64_t r3, uintptr_t ra)
77 {
78 bool valid;
79 CPUState *cs = env_cpu(env);
80 S390CPU *cpu = env_archcpu(env);
81 uint64_t addr = env->regs[r1];
82 uint64_t subcode = env->regs[r3];
83 IplParameterBlock *iplb;
84
85 if (env->psw.mask & PSW_MASK_PSTATE) {
86 s390_program_interrupt(env, PGM_PRIVILEGED, ra);
87 return;
88 }
89
90 if (subcode & ~0x0ffffULL) {
91 s390_program_interrupt(env, PGM_SPECIFICATION, ra);
92 return;
93 }
94
95 if (subcode >= DIAG308_PV_SET && !s390_has_feat(S390_FEAT_UNPACK)) {
96 s390_program_interrupt(env, PGM_SPECIFICATION, ra);
97 return;
98 }
99
100 switch (subcode) {
101 case DIAG308_RESET_MOD_CLR:
102 s390_ipl_reset_request(cs, S390_RESET_MODIFIED_CLEAR);
103 break;
104 case DIAG308_RESET_LOAD_NORM:
105 s390_ipl_reset_request(cs, S390_RESET_LOAD_NORMAL);
106 break;
107 case DIAG308_LOAD_CLEAR:
108 /* Well we still lack the clearing bit... */
109 s390_ipl_reset_request(cs, S390_RESET_REIPL);
110 break;
111 case DIAG308_SET:
112 case DIAG308_PV_SET:
113 if (diag308_parm_check(env, r1, addr, ra, false)) {
114 return;
115 }
116 iplb = g_new0(IplParameterBlock, 1);
117 if (!s390_is_pv()) {
118 cpu_physical_memory_read(addr, iplb, sizeof(iplb->len));
119 } else {
120 s390_cpu_pv_mem_read(cpu, 0, iplb, sizeof(iplb->len));
121 }
122
123 if (!iplb_valid_len(iplb)) {
124 env->regs[r1 + 1] = DIAG_308_RC_INVALID;
125 goto out;
126 }
127
128 if (!s390_is_pv()) {
129 cpu_physical_memory_read(addr, iplb, be32_to_cpu(iplb->len));
130 } else {
131 s390_cpu_pv_mem_read(cpu, 0, iplb, be32_to_cpu(iplb->len));
132 }
133
134 valid = subcode == DIAG308_PV_SET ? iplb_valid_pv(iplb) : iplb_valid(iplb);
135 if (!valid) {
136 if (subcode == DIAG308_SET && iplb->pbt == S390_IPL_TYPE_QEMU_SCSI) {
137 s390_rebuild_iplb(iplb->devno, iplb);
138 s390_ipl_update_diag308(iplb);
139 env->regs[r1 + 1] = DIAG_308_RC_OK;
140 } else {
141 env->regs[r1 + 1] = DIAG_308_RC_INVALID;
142 }
143
144 goto out;
145 }
146
147 s390_ipl_update_diag308(iplb);
148 env->regs[r1 + 1] = DIAG_308_RC_OK;
149 out:
150 g_free(iplb);
151 return;
152 case DIAG308_STORE:
153 case DIAG308_PV_STORE:
154 if (diag308_parm_check(env, r1, addr, ra, true)) {
155 return;
156 }
157 if (subcode == DIAG308_PV_STORE) {
158 iplb = s390_ipl_get_iplb_pv();
159 } else {
160 iplb = s390_ipl_get_iplb();
161 }
162 if (!iplb) {
163 env->regs[r1 + 1] = DIAG_308_RC_NO_CONF;
164 return;
165 }
166
167 if (!s390_is_pv()) {
168 cpu_physical_memory_write(addr, iplb, be32_to_cpu(iplb->len));
169 } else {
170 s390_cpu_pv_mem_write(cpu, 0, iplb, be32_to_cpu(iplb->len));
171 }
172 env->regs[r1 + 1] = DIAG_308_RC_OK;
173 return;
174 case DIAG308_PV_START:
175 iplb = s390_ipl_get_iplb_pv();
176 if (!iplb) {
177 env->regs[r1 + 1] = DIAG_308_RC_NO_PV_CONF;
178 return;
179 }
180
181 if (kvm_enabled() && kvm_s390_get_hpage_1m()) {
182 error_report("Protected VMs can currently not be backed with "
183 "huge pages");
184 env->regs[r1 + 1] = DIAG_308_RC_INVAL_FOR_PV;
185 return;
186 }
187
188 s390_ipl_reset_request(cs, S390_RESET_PV);
189 break;
190 default:
191 s390_program_interrupt(env, PGM_SPECIFICATION, ra);
192 break;
193 }
194 }
195