2 * sigp.c - handlinge interprocessor communication
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>
12 * Christian Ehrhardt <ehrhardt@de.ibm.com>
15 #include <linux/kvm.h>
16 #include <linux/kvm_host.h>
17 #include <linux/slab.h>
21 /* sigp order codes */
22 #define SIGP_SENSE 0x01
23 #define SIGP_EXTERNAL_CALL 0x02
24 #define SIGP_EMERGENCY 0x03
25 #define SIGP_START 0x04
26 #define SIGP_STOP 0x05
27 #define SIGP_RESTART 0x06
28 #define SIGP_STOP_STORE_STATUS 0x09
29 #define SIGP_INITIAL_CPU_RESET 0x0b
30 #define SIGP_CPU_RESET 0x0c
31 #define SIGP_SET_PREFIX 0x0d
32 #define SIGP_STORE_STATUS_ADDR 0x0e
33 #define SIGP_SET_ARCH 0x12
36 #define SIGP_STAT_EQUIPMENT_CHECK 0x80000000UL
37 #define SIGP_STAT_INCORRECT_STATE 0x00000200UL
38 #define SIGP_STAT_INVALID_PARAMETER 0x00000100UL
39 #define SIGP_STAT_EXT_CALL_PENDING 0x00000080UL
40 #define SIGP_STAT_STOPPED 0x00000040UL
41 #define SIGP_STAT_OPERATOR_INTERV 0x00000020UL
42 #define SIGP_STAT_CHECK_STOP 0x00000010UL
43 #define SIGP_STAT_INOPERATIVE 0x00000004UL
44 #define SIGP_STAT_INVALID_ORDER 0x00000002UL
45 #define SIGP_STAT_RECEIVER_CHECK 0x00000001UL
48 static int __sigp_sense(struct kvm_vcpu *vcpu, u16 cpu_addr,
51 struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
54 if (cpu_addr >= KVM_MAX_VCPUS)
55 return 3; /* not operational */
58 if (fi->local_int[cpu_addr] == NULL)
59 rc = 3; /* not operational */
60 else if (atomic_read(fi->local_int[cpu_addr]->cpuflags)
62 *reg &= 0xffffffff00000000UL;
63 rc = 1; /* status stored */
65 *reg &= 0xffffffff00000000UL;
66 *reg |= SIGP_STAT_STOPPED;
67 rc = 1; /* status stored */
69 spin_unlock(&fi->lock);
71 VCPU_EVENT(vcpu, 4, "sensed status of cpu %x rc %x", cpu_addr, rc);
75 static int __sigp_emergency(struct kvm_vcpu *vcpu, u16 cpu_addr)
77 struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
78 struct kvm_s390_local_interrupt *li;
79 struct kvm_s390_interrupt_info *inti;
82 if (cpu_addr >= KVM_MAX_VCPUS)
83 return 3; /* not operational */
85 inti = kzalloc(sizeof(*inti), GFP_KERNEL);
89 inti->type = KVM_S390_INT_EMERGENCY;
92 li = fi->local_int[cpu_addr];
94 rc = 3; /* not operational */
98 spin_lock_bh(&li->lock);
99 list_add_tail(&inti->list, &li->list);
100 atomic_set(&li->active, 1);
101 atomic_set_mask(CPUSTAT_EXT_INT, li->cpuflags);
102 if (waitqueue_active(&li->wq))
103 wake_up_interruptible(&li->wq);
104 spin_unlock_bh(&li->lock);
105 rc = 0; /* order accepted */
107 spin_unlock(&fi->lock);
108 VCPU_EVENT(vcpu, 4, "sent sigp emerg to cpu %x", cpu_addr);
112 static int __inject_sigp_stop(struct kvm_s390_local_interrupt *li, int action)
114 struct kvm_s390_interrupt_info *inti;
116 inti = kzalloc(sizeof(*inti), GFP_ATOMIC);
119 inti->type = KVM_S390_SIGP_STOP;
121 spin_lock_bh(&li->lock);
122 list_add_tail(&inti->list, &li->list);
123 atomic_set(&li->active, 1);
124 atomic_set_mask(CPUSTAT_STOP_INT, li->cpuflags);
125 li->action_bits |= action;
126 if (waitqueue_active(&li->wq))
127 wake_up_interruptible(&li->wq);
128 spin_unlock_bh(&li->lock);
130 return 0; /* order accepted */
133 static int __sigp_stop(struct kvm_vcpu *vcpu, u16 cpu_addr, int action)
135 struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
136 struct kvm_s390_local_interrupt *li;
139 if (cpu_addr >= KVM_MAX_VCPUS)
140 return 3; /* not operational */
142 spin_lock(&fi->lock);
143 li = fi->local_int[cpu_addr];
145 rc = 3; /* not operational */
149 rc = __inject_sigp_stop(li, action);
152 spin_unlock(&fi->lock);
153 VCPU_EVENT(vcpu, 4, "sent sigp stop to cpu %x", cpu_addr);
157 int kvm_s390_inject_sigp_stop(struct kvm_vcpu *vcpu, int action)
159 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
160 return __inject_sigp_stop(li, action);
163 static int __sigp_set_arch(struct kvm_vcpu *vcpu, u32 parameter)
167 switch (parameter & 0xff) {
169 rc = 3; /* not operational */
173 rc = 0; /* order accepted */
181 static int __sigp_set_prefix(struct kvm_vcpu *vcpu, u16 cpu_addr, u32 address,
184 struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
185 struct kvm_s390_local_interrupt *li = NULL;
186 struct kvm_s390_interrupt_info *inti;
190 /* make sure that the new value is valid memory */
191 address = address & 0x7fffe000u;
192 if ((copy_from_user(&tmp, (void __user *)
193 (address + vcpu->arch.sie_block->gmsor) , 1)) ||
194 (copy_from_user(&tmp, (void __user *)(address +
195 vcpu->arch.sie_block->gmsor + PAGE_SIZE), 1))) {
196 *reg |= SIGP_STAT_INVALID_PARAMETER;
197 return 1; /* invalid parameter */
200 inti = kzalloc(sizeof(*inti), GFP_KERNEL);
204 spin_lock(&fi->lock);
205 if (cpu_addr < KVM_MAX_VCPUS)
206 li = fi->local_int[cpu_addr];
209 rc = 1; /* incorrect state */
210 *reg &= SIGP_STAT_INCORRECT_STATE;
215 spin_lock_bh(&li->lock);
216 /* cpu must be in stopped state */
217 if (atomic_read(li->cpuflags) & CPUSTAT_RUNNING) {
218 rc = 1; /* incorrect state */
219 *reg &= SIGP_STAT_INCORRECT_STATE;
224 inti->type = KVM_S390_SIGP_SET_PREFIX;
225 inti->prefix.address = address;
227 list_add_tail(&inti->list, &li->list);
228 atomic_set(&li->active, 1);
229 if (waitqueue_active(&li->wq))
230 wake_up_interruptible(&li->wq);
231 rc = 0; /* order accepted */
233 VCPU_EVENT(vcpu, 4, "set prefix of cpu %02x to %x", cpu_addr, address);
235 spin_unlock_bh(&li->lock);
237 spin_unlock(&fi->lock);
241 int kvm_s390_handle_sigp(struct kvm_vcpu *vcpu)
243 int r1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
244 int r3 = vcpu->arch.sie_block->ipa & 0x000f;
245 int base2 = vcpu->arch.sie_block->ipb >> 28;
246 int disp2 = ((vcpu->arch.sie_block->ipb & 0x0fff0000) >> 16);
248 u16 cpu_addr = vcpu->arch.guest_gprs[r3];
252 /* sigp in userspace can exit */
253 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
254 return kvm_s390_inject_program_int(vcpu,
255 PGM_PRIVILEGED_OPERATION);
259 order_code += vcpu->arch.guest_gprs[base2];
262 parameter = vcpu->arch.guest_gprs[r1];
264 parameter = vcpu->arch.guest_gprs[r1 + 1];
266 switch (order_code) {
268 vcpu->stat.instruction_sigp_sense++;
269 rc = __sigp_sense(vcpu, cpu_addr,
270 &vcpu->arch.guest_gprs[r1]);
273 vcpu->stat.instruction_sigp_emergency++;
274 rc = __sigp_emergency(vcpu, cpu_addr);
277 vcpu->stat.instruction_sigp_stop++;
278 rc = __sigp_stop(vcpu, cpu_addr, ACTION_STOP_ON_STOP);
280 case SIGP_STOP_STORE_STATUS:
281 vcpu->stat.instruction_sigp_stop++;
282 rc = __sigp_stop(vcpu, cpu_addr, ACTION_STORE_ON_STOP);
285 vcpu->stat.instruction_sigp_arch++;
286 rc = __sigp_set_arch(vcpu, parameter);
288 case SIGP_SET_PREFIX:
289 vcpu->stat.instruction_sigp_prefix++;
290 rc = __sigp_set_prefix(vcpu, cpu_addr, parameter,
291 &vcpu->arch.guest_gprs[r1]);
294 vcpu->stat.instruction_sigp_restart++;
295 /* user space must know about restart */
303 vcpu->arch.sie_block->gpsw.mask &= ~(3ul << 44);
304 vcpu->arch.sie_block->gpsw.mask |= (rc & 3ul) << 44;