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-rw-r--r--arch/s390/kvm/priv.c323
1 files changed, 323 insertions, 0 deletions
diff --git a/arch/s390/kvm/priv.c b/arch/s390/kvm/priv.c
new file mode 100644
index 000000000000..1465946325c5
--- /dev/null
+++ b/arch/s390/kvm/priv.c
@@ -0,0 +1,323 @@
1/*
2 * priv.c - handling privileged instructions
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.h>
15#include <linux/errno.h>
16#include <asm/current.h>
17#include <asm/debug.h>
18#include <asm/ebcdic.h>
19#include <asm/sysinfo.h>
20#include "gaccess.h"
21#include "kvm-s390.h"
22
23static int handle_set_prefix(struct kvm_vcpu *vcpu)
24{
25 int base2 = vcpu->arch.sie_block->ipb >> 28;
26 int disp2 = ((vcpu->arch.sie_block->ipb & 0x0fff0000) >> 16);
27 u64 operand2;
28 u32 address = 0;
29 u8 tmp;
30
31 vcpu->stat.instruction_spx++;
32
33 operand2 = disp2;
34 if (base2)
35 operand2 += vcpu->arch.guest_gprs[base2];
36
37 /* must be word boundary */
38 if (operand2 & 3) {
39 kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
40 goto out;
41 }
42
43 /* get the value */
44 if (get_guest_u32(vcpu, operand2, &address)) {
45 kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
46 goto out;
47 }
48
49 address = address & 0x7fffe000u;
50
51 /* make sure that the new value is valid memory */
52 if (copy_from_guest_absolute(vcpu, &tmp, address, 1) ||
53 (copy_from_guest_absolute(vcpu, &tmp, address + PAGE_SIZE, 1))) {
54 kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
55 goto out;
56 }
57
58 vcpu->arch.sie_block->prefix = address;
59 vcpu->arch.sie_block->ihcpu = 0xffff;
60
61 VCPU_EVENT(vcpu, 5, "setting prefix to %x", address);
62out:
63 return 0;
64}
65
66static int handle_store_prefix(struct kvm_vcpu *vcpu)
67{
68 int base2 = vcpu->arch.sie_block->ipb >> 28;
69 int disp2 = ((vcpu->arch.sie_block->ipb & 0x0fff0000) >> 16);
70 u64 operand2;
71 u32 address;
72
73 vcpu->stat.instruction_stpx++;
74 operand2 = disp2;
75 if (base2)
76 operand2 += vcpu->arch.guest_gprs[base2];
77
78 /* must be word boundary */
79 if (operand2 & 3) {
80 kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
81 goto out;
82 }
83
84 address = vcpu->arch.sie_block->prefix;
85 address = address & 0x7fffe000u;
86
87 /* get the value */
88 if (put_guest_u32(vcpu, operand2, address)) {
89 kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
90 goto out;
91 }
92
93 VCPU_EVENT(vcpu, 5, "storing prefix to %x", address);
94out:
95 return 0;
96}
97
98static int handle_store_cpu_address(struct kvm_vcpu *vcpu)
99{
100 int base2 = vcpu->arch.sie_block->ipb >> 28;
101 int disp2 = ((vcpu->arch.sie_block->ipb & 0x0fff0000) >> 16);
102 u64 useraddr;
103 int rc;
104
105 vcpu->stat.instruction_stap++;
106 useraddr = disp2;
107 if (base2)
108 useraddr += vcpu->arch.guest_gprs[base2];
109
110 if (useraddr & 1) {
111 kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
112 goto out;
113 }
114
115 rc = put_guest_u16(vcpu, useraddr, vcpu->vcpu_id);
116 if (rc == -EFAULT) {
117 kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
118 goto out;
119 }
120
121 VCPU_EVENT(vcpu, 5, "storing cpu address to %lx", useraddr);
122out:
123 return 0;
124}
125
126static int handle_skey(struct kvm_vcpu *vcpu)
127{
128 vcpu->stat.instruction_storage_key++;
129 vcpu->arch.sie_block->gpsw.addr -= 4;
130 VCPU_EVENT(vcpu, 4, "%s", "retrying storage key operation");
131 return 0;
132}
133
134static int handle_stsch(struct kvm_vcpu *vcpu)
135{
136 vcpu->stat.instruction_stsch++;
137 VCPU_EVENT(vcpu, 4, "%s", "store subchannel - CC3");
138 /* condition code 3 */
139 vcpu->arch.sie_block->gpsw.mask &= ~(3ul << 44);
140 vcpu->arch.sie_block->gpsw.mask |= (3 & 3ul) << 44;
141 return 0;
142}
143
144static int handle_chsc(struct kvm_vcpu *vcpu)
145{
146 vcpu->stat.instruction_chsc++;
147 VCPU_EVENT(vcpu, 4, "%s", "channel subsystem call - CC3");
148 /* condition code 3 */
149 vcpu->arch.sie_block->gpsw.mask &= ~(3ul << 44);
150 vcpu->arch.sie_block->gpsw.mask |= (3 & 3ul) << 44;
151 return 0;
152}
153
154static unsigned int kvm_stfl(void)
155{
156 asm volatile(
157 " .insn s,0xb2b10000,0(0)\n" /* stfl */
158 "0:\n"
159 EX_TABLE(0b, 0b));
160 return S390_lowcore.stfl_fac_list;
161}
162
163static int handle_stfl(struct kvm_vcpu *vcpu)
164{
165 unsigned int facility_list = kvm_stfl();
166 int rc;
167
168 vcpu->stat.instruction_stfl++;
169 facility_list &= ~(1UL<<24); /* no stfle */
170
171 rc = copy_to_guest(vcpu, offsetof(struct _lowcore, stfl_fac_list),
172 &facility_list, sizeof(facility_list));
173 if (rc == -EFAULT)
174 kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
175 else
176 VCPU_EVENT(vcpu, 5, "store facility list value %x",
177 facility_list);
178 return 0;
179}
180
181static int handle_stidp(struct kvm_vcpu *vcpu)
182{
183 int base2 = vcpu->arch.sie_block->ipb >> 28;
184 int disp2 = ((vcpu->arch.sie_block->ipb & 0x0fff0000) >> 16);
185 u64 operand2;
186 int rc;
187
188 vcpu->stat.instruction_stidp++;
189 operand2 = disp2;
190 if (base2)
191 operand2 += vcpu->arch.guest_gprs[base2];
192
193 if (operand2 & 7) {
194 kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
195 goto out;
196 }
197
198 rc = put_guest_u64(vcpu, operand2, vcpu->arch.stidp_data);
199 if (rc == -EFAULT) {
200 kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
201 goto out;
202 }
203
204 VCPU_EVENT(vcpu, 5, "%s", "store cpu id");
205out:
206 return 0;
207}
208
209static void handle_stsi_3_2_2(struct kvm_vcpu *vcpu, struct sysinfo_3_2_2 *mem)
210{
211 struct float_interrupt *fi = &vcpu->kvm->arch.float_int;
212 int cpus = 0;
213 int n;
214
215 spin_lock_bh(&fi->lock);
216 for (n = 0; n < KVM_MAX_VCPUS; n++)
217 if (fi->local_int[n])
218 cpus++;
219 spin_unlock_bh(&fi->lock);
220
221 /* deal with other level 3 hypervisors */
222 if (stsi(mem, 3, 2, 2) == -ENOSYS)
223 mem->count = 0;
224 if (mem->count < 8)
225 mem->count++;
226 for (n = mem->count - 1; n > 0 ; n--)
227 memcpy(&mem->vm[n], &mem->vm[n - 1], sizeof(mem->vm[0]));
228
229 mem->vm[0].cpus_total = cpus;
230 mem->vm[0].cpus_configured = cpus;
231 mem->vm[0].cpus_standby = 0;
232 mem->vm[0].cpus_reserved = 0;
233 mem->vm[0].caf = 1000;
234 memcpy(mem->vm[0].name, "KVMguest", 8);
235 ASCEBC(mem->vm[0].name, 8);
236 memcpy(mem->vm[0].cpi, "KVM/Linux ", 16);
237 ASCEBC(mem->vm[0].cpi, 16);
238}
239
240static int handle_stsi(struct kvm_vcpu *vcpu)
241{
242 int fc = (vcpu->arch.guest_gprs[0] & 0xf0000000) >> 28;
243 int sel1 = vcpu->arch.guest_gprs[0] & 0xff;
244 int sel2 = vcpu->arch.guest_gprs[1] & 0xffff;
245 int base2 = vcpu->arch.sie_block->ipb >> 28;
246 int disp2 = ((vcpu->arch.sie_block->ipb & 0x0fff0000) >> 16);
247 u64 operand2;
248 unsigned long mem;
249
250 vcpu->stat.instruction_stsi++;
251 VCPU_EVENT(vcpu, 4, "stsi: fc: %x sel1: %x sel2: %x", fc, sel1, sel2);
252
253 operand2 = disp2;
254 if (base2)
255 operand2 += vcpu->arch.guest_gprs[base2];
256
257 if (operand2 & 0xfff && fc > 0)
258 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
259
260 switch (fc) {
261 case 0:
262 vcpu->arch.guest_gprs[0] = 3 << 28;
263 vcpu->arch.sie_block->gpsw.mask &= ~(3ul << 44);
264 return 0;
265 case 1: /* same handling for 1 and 2 */
266 case 2:
267 mem = get_zeroed_page(GFP_KERNEL);
268 if (!mem)
269 goto out_fail;
270 if (stsi((void *) mem, fc, sel1, sel2) == -ENOSYS)
271 goto out_mem;
272 break;
273 case 3:
274 if (sel1 != 2 || sel2 != 2)
275 goto out_fail;
276 mem = get_zeroed_page(GFP_KERNEL);
277 if (!mem)
278 goto out_fail;
279 handle_stsi_3_2_2(vcpu, (void *) mem);
280 break;
281 default:
282 goto out_fail;
283 }
284
285 if (copy_to_guest_absolute(vcpu, operand2, (void *) mem, PAGE_SIZE)) {
286 kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
287 goto out_mem;
288 }
289 free_page(mem);
290 vcpu->arch.sie_block->gpsw.mask &= ~(3ul << 44);
291 vcpu->arch.guest_gprs[0] = 0;
292 return 0;
293out_mem:
294 free_page(mem);
295out_fail:
296 /* condition code 3 */
297 vcpu->arch.sie_block->gpsw.mask |= 3ul << 44;
298 return 0;
299}
300
301static intercept_handler_t priv_handlers[256] = {
302 [0x02] = handle_stidp,
303 [0x10] = handle_set_prefix,
304 [0x11] = handle_store_prefix,
305 [0x12] = handle_store_cpu_address,
306 [0x29] = handle_skey,
307 [0x2a] = handle_skey,
308 [0x2b] = handle_skey,
309 [0x34] = handle_stsch,
310 [0x5f] = handle_chsc,
311 [0x7d] = handle_stsi,
312 [0xb1] = handle_stfl,
313};
314
315int kvm_s390_handle_priv(struct kvm_vcpu *vcpu)
316{
317 intercept_handler_t handler;
318
319 handler = priv_handlers[vcpu->arch.sie_block->ipa & 0x00ff];
320 if (handler)
321 return handler(vcpu);
322 return -ENOTSUPP;
323}
generated by cgit v1.2.2 (git 2.25.0) at 2024-11-16 03:03:01 -0500