Linux Kernel  3.7.1
 All Data Structures Namespaces Files Functions Variables Typedefs Enumerations Enumerator Macros Groups Pages
intercept.c
Go to the documentation of this file.
1 /*
2  * in-kernel handling for sie intercepts
3  *
4  * Copyright IBM Corp. 2008, 2009
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 <[email protected]>
11  * Christian Borntraeger <[email protected]>
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 #include "trace.h"
23 #include "trace-s390.h"
24 
25 static int handle_lctlg(struct kvm_vcpu *vcpu)
26 {
27  int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
28  int reg3 = vcpu->arch.sie_block->ipa & 0x000f;
29  int base2 = vcpu->arch.sie_block->ipb >> 28;
30  int disp2 = ((vcpu->arch.sie_block->ipb & 0x0fff0000) >> 16) +
31  ((vcpu->arch.sie_block->ipb & 0xff00) << 4);
32  u64 useraddr;
33  int reg, rc;
34 
35  vcpu->stat.instruction_lctlg++;
36  if ((vcpu->arch.sie_block->ipb & 0xff) != 0x2f)
37  return -EOPNOTSUPP;
38 
39  useraddr = disp2;
40  if (base2)
41  useraddr += vcpu->run->s.regs.gprs[base2];
42 
43  if (useraddr & 7)
44  return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
45 
46  reg = reg1;
47 
48  VCPU_EVENT(vcpu, 5, "lctlg r1:%x, r3:%x,b2:%x,d2:%x", reg1, reg3, base2,
49  disp2);
50  trace_kvm_s390_handle_lctl(vcpu, 1, reg1, reg3, useraddr);
51 
52  do {
53  rc = get_guest_u64(vcpu, useraddr,
54  &vcpu->arch.sie_block->gcr[reg]);
55  if (rc == -EFAULT) {
56  kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
57  break;
58  }
59  useraddr += 8;
60  if (reg == reg3)
61  break;
62  reg = (reg + 1) % 16;
63  } while (1);
64  return 0;
65 }
66 
67 static int handle_lctl(struct kvm_vcpu *vcpu)
68 {
69  int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
70  int reg3 = vcpu->arch.sie_block->ipa & 0x000f;
71  int base2 = vcpu->arch.sie_block->ipb >> 28;
72  int disp2 = ((vcpu->arch.sie_block->ipb & 0x0fff0000) >> 16);
73  u64 useraddr;
74  u32 val = 0;
75  int reg, rc;
76 
77  vcpu->stat.instruction_lctl++;
78 
79  useraddr = disp2;
80  if (base2)
81  useraddr += vcpu->run->s.regs.gprs[base2];
82 
83  if (useraddr & 3)
84  return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
85 
86  VCPU_EVENT(vcpu, 5, "lctl r1:%x, r3:%x,b2:%x,d2:%x", reg1, reg3, base2,
87  disp2);
88  trace_kvm_s390_handle_lctl(vcpu, 0, reg1, reg3, useraddr);
89 
90  reg = reg1;
91  do {
92  rc = get_guest_u32(vcpu, useraddr, &val);
93  if (rc == -EFAULT) {
94  kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
95  break;
96  }
97  vcpu->arch.sie_block->gcr[reg] &= 0xffffffff00000000ul;
98  vcpu->arch.sie_block->gcr[reg] |= val;
99  useraddr += 4;
100  if (reg == reg3)
101  break;
102  reg = (reg + 1) % 16;
103  } while (1);
104  return 0;
105 }
106 
107 static intercept_handler_t instruction_handlers[256] = {
108  [0x01] = kvm_s390_handle_01,
109  [0x83] = kvm_s390_handle_diag,
110  [0xae] = kvm_s390_handle_sigp,
111  [0xb2] = kvm_s390_handle_b2,
112  [0xb7] = handle_lctl,
113  [0xe5] = kvm_s390_handle_e5,
114  [0xeb] = handle_lctlg,
115 };
116 
117 static int handle_noop(struct kvm_vcpu *vcpu)
118 {
119  switch (vcpu->arch.sie_block->icptcode) {
120  case 0x0:
121  vcpu->stat.exit_null++;
122  break;
123  case 0x10:
124  vcpu->stat.exit_external_request++;
125  break;
126  case 0x14:
127  vcpu->stat.exit_external_interrupt++;
128  break;
129  default:
130  break; /* nothing */
131  }
132  return 0;
133 }
134 
135 static int handle_stop(struct kvm_vcpu *vcpu)
136 {
137  int rc = 0;
138 
139  vcpu->stat.exit_stop_request++;
140  spin_lock_bh(&vcpu->arch.local_int.lock);
141 
142  trace_kvm_s390_stop_request(vcpu->arch.local_int.action_bits);
143 
144  if (vcpu->arch.local_int.action_bits & ACTION_RELOADVCPU_ON_STOP) {
145  vcpu->arch.local_int.action_bits &= ~ACTION_RELOADVCPU_ON_STOP;
146  rc = SIE_INTERCEPT_RERUNVCPU;
147  vcpu->run->exit_reason = KVM_EXIT_INTR;
148  }
149 
150  if (vcpu->arch.local_int.action_bits & ACTION_STOP_ON_STOP) {
151  atomic_set_mask(CPUSTAT_STOPPED,
152  &vcpu->arch.sie_block->cpuflags);
153  vcpu->arch.local_int.action_bits &= ~ACTION_STOP_ON_STOP;
154  VCPU_EVENT(vcpu, 3, "%s", "cpu stopped");
155  rc = -EOPNOTSUPP;
156  }
157 
158  if (vcpu->arch.local_int.action_bits & ACTION_STORE_ON_STOP) {
159  vcpu->arch.local_int.action_bits &= ~ACTION_STORE_ON_STOP;
160  /* store status must be called unlocked. Since local_int.lock
161  * only protects local_int.* and not guest memory we can give
162  * up the lock here */
163  spin_unlock_bh(&vcpu->arch.local_int.lock);
164  rc = kvm_s390_vcpu_store_status(vcpu,
165  KVM_S390_STORE_STATUS_NOADDR);
166  if (rc >= 0)
167  rc = -EOPNOTSUPP;
168  } else
169  spin_unlock_bh(&vcpu->arch.local_int.lock);
170  return rc;
171 }
172 
173 static int handle_validity(struct kvm_vcpu *vcpu)
174 {
175  unsigned long vmaddr;
176  int viwhy = vcpu->arch.sie_block->ipb >> 16;
177  int rc;
178 
179  vcpu->stat.exit_validity++;
180  trace_kvm_s390_intercept_validity(vcpu, viwhy);
181  if (viwhy == 0x37) {
182  vmaddr = gmap_fault(vcpu->arch.sie_block->prefix,
183  vcpu->arch.gmap);
184  if (IS_ERR_VALUE(vmaddr)) {
185  rc = -EOPNOTSUPP;
186  goto out;
187  }
188  rc = fault_in_pages_writeable((char __user *) vmaddr,
189  PAGE_SIZE);
190  if (rc) {
191  /* user will receive sigsegv, exit to user */
192  rc = -EOPNOTSUPP;
193  goto out;
194  }
195  vmaddr = gmap_fault(vcpu->arch.sie_block->prefix + PAGE_SIZE,
196  vcpu->arch.gmap);
197  if (IS_ERR_VALUE(vmaddr)) {
198  rc = -EOPNOTSUPP;
199  goto out;
200  }
201  rc = fault_in_pages_writeable((char __user *) vmaddr,
202  PAGE_SIZE);
203  if (rc) {
204  /* user will receive sigsegv, exit to user */
205  rc = -EOPNOTSUPP;
206  goto out;
207  }
208  } else
209  rc = -EOPNOTSUPP;
210 
211 out:
212  if (rc)
213  VCPU_EVENT(vcpu, 2, "unhandled validity intercept code %d",
214  viwhy);
215  return rc;
216 }
217 
218 static int handle_instruction(struct kvm_vcpu *vcpu)
219 {
220  intercept_handler_t handler;
221 
222  vcpu->stat.exit_instruction++;
223  trace_kvm_s390_intercept_instruction(vcpu,
224  vcpu->arch.sie_block->ipa,
225  vcpu->arch.sie_block->ipb);
226  handler = instruction_handlers[vcpu->arch.sie_block->ipa >> 8];
227  if (handler)
228  return handler(vcpu);
229  return -EOPNOTSUPP;
230 }
231 
232 static int handle_prog(struct kvm_vcpu *vcpu)
233 {
234  vcpu->stat.exit_program_interruption++;
235  trace_kvm_s390_intercept_prog(vcpu, vcpu->arch.sie_block->iprcc);
236  return kvm_s390_inject_program_int(vcpu, vcpu->arch.sie_block->iprcc);
237 }
238 
239 static int handle_instruction_and_prog(struct kvm_vcpu *vcpu)
240 {
241  int rc, rc2;
242 
243  vcpu->stat.exit_instr_and_program++;
244  rc = handle_instruction(vcpu);
245  rc2 = handle_prog(vcpu);
246 
247  if (rc == -EOPNOTSUPP)
248  vcpu->arch.sie_block->icptcode = 0x04;
249  if (rc)
250  return rc;
251  return rc2;
252 }
253 
254 static const intercept_handler_t intercept_funcs[] = {
255  [0x00 >> 2] = handle_noop,
256  [0x04 >> 2] = handle_instruction,
257  [0x08 >> 2] = handle_prog,
258  [0x0C >> 2] = handle_instruction_and_prog,
259  [0x10 >> 2] = handle_noop,
260  [0x14 >> 2] = handle_noop,
261  [0x1C >> 2] = kvm_s390_handle_wait,
262  [0x20 >> 2] = handle_validity,
263  [0x28 >> 2] = handle_stop,
264 };
265 
266 int kvm_handle_sie_intercept(struct kvm_vcpu *vcpu)
267 {
268  intercept_handler_t func;
269  u8 code = vcpu->arch.sie_block->icptcode;
270 
271  if (code & 3 || (code >> 2) >= ARRAY_SIZE(intercept_funcs))
272  return -EOPNOTSUPP;
273  func = intercept_funcs[code >> 2];
274  if (func)
275  return func(vcpu);
276  return -EOPNOTSUPP;
277 }
Generated on Thu Jan 10 2013 13:16:55 for Linux Kernel by   doxygen 1.8.2