2 * in-kernel handling for sie intercepts
4 * Copyright IBM Corp. 2008, 2009
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.
10 * Author(s): Carsten Otte <cotte@de.ibm.com>
11 * Christian Borntraeger <borntraeger@de.ibm.com>
14 #include <linux/kvm_host.h>
15 #include <linux/errno.h>
16 #include <linux/pagemap.h>
18 #include <asm/kvm_host.h>
23 #include "trace-s390.h"
25 static int handle_lctlg(struct kvm_vcpu *vcpu)
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);
35 vcpu->stat.instruction_lctlg++;
36 if ((vcpu->arch.sie_block->ipb & 0xff) != 0x2f)
41 useraddr += vcpu->run->s.regs.gprs[base2];
44 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
48 VCPU_EVENT(vcpu, 5, "lctlg r1:%x, r3:%x,b2:%x,d2:%x", reg1, reg3, base2,
50 trace_kvm_s390_handle_lctl(vcpu, 1, reg1, reg3, useraddr);
53 rc = get_guest_u64(vcpu, useraddr,
54 &vcpu->arch.sie_block->gcr[reg]);
56 kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
67 static int handle_lctl(struct kvm_vcpu *vcpu)
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);
77 vcpu->stat.instruction_lctl++;
81 useraddr += vcpu->run->s.regs.gprs[base2];
84 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
86 VCPU_EVENT(vcpu, 5, "lctl r1:%x, r3:%x,b2:%x,d2:%x", reg1, reg3, base2,
88 trace_kvm_s390_handle_lctl(vcpu, 0, reg1, reg3, useraddr);
92 rc = get_guest_u32(vcpu, useraddr, &val);
94 kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
97 vcpu->arch.sie_block->gcr[reg] &= 0xffffffff00000000ul;
98 vcpu->arch.sie_block->gcr[reg] |= val;
102 reg = (reg + 1) % 16;
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,
117 static int handle_noop(struct kvm_vcpu *vcpu)
119 switch (vcpu->arch.sie_block->icptcode) {
121 vcpu->stat.exit_null++;
124 vcpu->stat.exit_external_request++;
127 vcpu->stat.exit_external_interrupt++;
135 static int handle_stop(struct kvm_vcpu *vcpu)
139 vcpu->stat.exit_stop_request++;
140 spin_lock_bh(&vcpu->arch.local_int.lock);
142 trace_kvm_s390_stop_request(vcpu->arch.local_int.action_bits);
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;
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");
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);
169 spin_unlock_bh(&vcpu->arch.local_int.lock);
173 static int handle_validity(struct kvm_vcpu *vcpu)
175 unsigned long vmaddr;
176 int viwhy = vcpu->arch.sie_block->ipb >> 16;
179 vcpu->stat.exit_validity++;
180 trace_kvm_s390_intercept_validity(vcpu, viwhy);
182 vmaddr = gmap_fault(vcpu->arch.sie_block->prefix,
184 if (IS_ERR_VALUE(vmaddr)) {
188 rc = fault_in_pages_writeable((char __user *) vmaddr,
191 /* user will receive sigsegv, exit to user */
195 vmaddr = gmap_fault(vcpu->arch.sie_block->prefix + PAGE_SIZE,
197 if (IS_ERR_VALUE(vmaddr)) {
201 rc = fault_in_pages_writeable((char __user *) vmaddr,
204 /* user will receive sigsegv, exit to user */
213 VCPU_EVENT(vcpu, 2, "unhandled validity intercept code %d",
218 static int handle_instruction(struct kvm_vcpu *vcpu)
220 intercept_handler_t handler;
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];
228 return handler(vcpu);
232 static int handle_prog(struct kvm_vcpu *vcpu)
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);
239 static int handle_instruction_and_prog(struct kvm_vcpu *vcpu)
243 vcpu->stat.exit_instr_and_program++;
244 rc = handle_instruction(vcpu);
245 rc2 = handle_prog(vcpu);
247 if (rc == -EOPNOTSUPP)
248 vcpu->arch.sie_block->icptcode = 0x04;
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,
266 int kvm_handle_sie_intercept(struct kvm_vcpu *vcpu)
268 intercept_handler_t func;
269 u8 code = vcpu->arch.sie_block->icptcode;
271 if (code & 3 || (code >> 2) >= ARRAY_SIZE(intercept_funcs))
273 func = intercept_funcs[code >> 2];