[deliverable/linux.git] / arch / s390 / kvm / sigp.c

/*
 * sigp.c - handlinge interprocessor communication
 *
 * Copyright IBM Corp. 2008
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License (version 2 only)
 * as published by the Free Software Foundation.
 *
 *    Author(s): Carsten Otte <cotte@de.ibm.com>
 *               Christian Borntraeger <borntraeger@de.ibm.com>
 */

#include <linux/kvm.h>
#include <linux/kvm_host.h>
#include "gaccess.h"
#include "kvm-s390.h"

/* sigp order codes */
#define SIGP_SENSE             0x01
#define SIGP_EXTERNAL_CALL     0x02
#define SIGP_EMERGENCY         0x03
#define SIGP_START             0x04
#define SIGP_STOP              0x05
#define SIGP_RESTART           0x06
#define SIGP_STOP_STORE_STATUS 0x09
#define SIGP_INITIAL_CPU_RESET 0x0b
#define SIGP_CPU_RESET         0x0c
#define SIGP_SET_PREFIX        0x0d
#define SIGP_STORE_STATUS_ADDR 0x0e
#define SIGP_SET_ARCH          0x12

/* cpu status bits */
#define SIGP_STAT_EQUIPMENT_CHECK   0x80000000UL
#define SIGP_STAT_INCORRECT_STATE   0x00000200UL
#define SIGP_STAT_INVALID_PARAMETER 0x00000100UL
#define SIGP_STAT_EXT_CALL_PENDING  0x00000080UL
#define SIGP_STAT_STOPPED           0x00000040UL
#define SIGP_STAT_OPERATOR_INTERV   0x00000020UL
#define SIGP_STAT_CHECK_STOP        0x00000010UL
#define SIGP_STAT_INOPERATIVE       0x00000004UL
#define SIGP_STAT_INVALID_ORDER     0x00000002UL
#define SIGP_STAT_RECEIVER_CHECK    0x00000001UL


static int __sigp_sense(struct kvm_vcpu *vcpu, u16 cpu_addr, u64 *reg)
{
	struct float_interrupt *fi = &vcpu->kvm->arch.float_int;
	int rc;

	if (cpu_addr >= KVM_MAX_VCPUS)
		return 3; /* not operational */

	spin_lock_bh(&fi->lock);
	if (fi->local_int[cpu_addr] == NULL)
		rc = 3; /* not operational */
	else if (atomic_read(fi->local_int[cpu_addr]->cpuflags)
		 & CPUSTAT_RUNNING) {
		*reg &= 0xffffffff00000000UL;
		rc = 1; /* status stored */
	} else {
		*reg &= 0xffffffff00000000UL;
		*reg |= SIGP_STAT_STOPPED;
		rc = 1; /* status stored */
	}
	spin_unlock_bh(&fi->lock);

	VCPU_EVENT(vcpu, 4, "sensed status of cpu %x rc %x", cpu_addr, rc);
	return rc;
}

static int __sigp_emergency(struct kvm_vcpu *vcpu, u16 cpu_addr)
{
	struct float_interrupt *fi = &vcpu->kvm->arch.float_int;
	struct local_interrupt *li;
	struct interrupt_info *inti;
	int rc;

	if (cpu_addr >= KVM_MAX_VCPUS)
		return 3; /* not operational */

	inti = kzalloc(sizeof(*inti), GFP_KERNEL);
	if (!inti)
		return -ENOMEM;

	inti->type = KVM_S390_INT_EMERGENCY;

	spin_lock_bh(&fi->lock);
	li = fi->local_int[cpu_addr];
	if (li == NULL) {
		rc = 3; /* not operational */
		kfree(inti);
		goto unlock;
	}
	spin_lock_bh(&li->lock);
	list_add_tail(&inti->list, &li->list);
	atomic_set(&li->active, 1);
	atomic_set_mask(CPUSTAT_EXT_INT, li->cpuflags);
	if (waitqueue_active(&li->wq))
		wake_up_interruptible(&li->wq);
	spin_unlock_bh(&li->lock);
	rc = 0; /* order accepted */
unlock:
	spin_unlock_bh(&fi->lock);
	VCPU_EVENT(vcpu, 4, "sent sigp emerg to cpu %x", cpu_addr);
	return rc;
}

static int __sigp_stop(struct kvm_vcpu *vcpu, u16 cpu_addr, int store)
{
	struct float_interrupt *fi = &vcpu->kvm->arch.float_int;
	struct local_interrupt *li;
	struct interrupt_info *inti;
	int rc;

	if (cpu_addr >= KVM_MAX_VCPUS)
		return 3; /* not operational */

	inti = kzalloc(sizeof(*inti), GFP_KERNEL);
	if (!inti)
		return -ENOMEM;

	inti->type = KVM_S390_SIGP_STOP;

	spin_lock_bh(&fi->lock);
	li = fi->local_int[cpu_addr];
	if (li == NULL) {
		rc = 3; /* not operational */
		kfree(inti);
		goto unlock;
	}
	spin_lock_bh(&li->lock);
	list_add_tail(&inti->list, &li->list);
	atomic_set(&li->active, 1);
	atomic_set_mask(CPUSTAT_STOP_INT, li->cpuflags);
	if (store)
		li->action_bits |= ACTION_STORE_ON_STOP;
	li->action_bits |= ACTION_STOP_ON_STOP;
	if (waitqueue_active(&li->wq))
		wake_up_interruptible(&li->wq);
	spin_unlock_bh(&li->lock);
	rc = 0; /* order accepted */
unlock:
	spin_unlock_bh(&fi->lock);
	VCPU_EVENT(vcpu, 4, "sent sigp stop to cpu %x", cpu_addr);
	return rc;
}

static int __sigp_set_arch(struct kvm_vcpu *vcpu, u32 parameter)
{
	int rc;

	switch (parameter & 0xff) {
	case 0:
		printk(KERN_WARNING "kvm: request to switch to ESA/390 mode"
							" not supported");
		rc = 3; /* not operational */
		break;
	case 1:
	case 2:
		rc = 0; /* order accepted */
		break;
	default:
		rc = -ENOTSUPP;
	}
	return rc;
}

static int __sigp_set_prefix(struct kvm_vcpu *vcpu, u16 cpu_addr, u32 address,
			     u64 *reg)
{
	struct float_interrupt *fi = &vcpu->kvm->arch.float_int;
	struct local_interrupt *li;
	struct interrupt_info *inti;
	int rc;
	u8 tmp;

	/* make sure that the new value is valid memory */
	address = address & 0x7fffe000u;
	if ((copy_from_guest(vcpu, &tmp,
		(u64) (address + vcpu->kvm->arch.guest_origin) , 1)) ||
	   (copy_from_guest(vcpu, &tmp, (u64) (address +
			vcpu->kvm->arch.guest_origin + PAGE_SIZE), 1))) {
		*reg |= SIGP_STAT_INVALID_PARAMETER;
		return 1; /* invalid parameter */
	}

	inti = kzalloc(sizeof(*inti), GFP_KERNEL);
	if (!inti)
		return 2; /* busy */

	spin_lock_bh(&fi->lock);
	li = fi->local_int[cpu_addr];

	if ((cpu_addr >= KVM_MAX_VCPUS) || (li == NULL)) {
		rc = 1; /* incorrect state */
		*reg &= SIGP_STAT_INCORRECT_STATE;
		kfree(inti);
		goto out_fi;
	}

	spin_lock_bh(&li->lock);
	/* cpu must be in stopped state */
	if (atomic_read(li->cpuflags) & CPUSTAT_RUNNING) {
		rc = 1; /* incorrect state */
		*reg &= SIGP_STAT_INCORRECT_STATE;
		kfree(inti);
		goto out_li;
	}

	inti->type = KVM_S390_SIGP_SET_PREFIX;
	inti->prefix.address = address;

	list_add_tail(&inti->list, &li->list);
	atomic_set(&li->active, 1);
	if (waitqueue_active(&li->wq))
		wake_up_interruptible(&li->wq);
	rc = 0; /* order accepted */

	VCPU_EVENT(vcpu, 4, "set prefix of cpu %02x to %x", cpu_addr, address);
out_li:
	spin_unlock_bh(&li->lock);
out_fi:
	spin_unlock_bh(&fi->lock);
	return rc;
}

int kvm_s390_handle_sigp(struct kvm_vcpu *vcpu)
{
	int r1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
	int r3 = vcpu->arch.sie_block->ipa & 0x000f;
	int base2 = vcpu->arch.sie_block->ipb >> 28;
	int disp2 = ((vcpu->arch.sie_block->ipb & 0x0fff0000) >> 16);
	u32 parameter;
	u16 cpu_addr = vcpu->arch.guest_gprs[r3];
	u8 order_code;
	int rc;

	order_code = disp2;
	if (base2)
		order_code += vcpu->arch.guest_gprs[base2];

	if (r1 % 2)
		parameter = vcpu->arch.guest_gprs[r1];
	else
		parameter = vcpu->arch.guest_gprs[r1 + 1];

	switch (order_code) {
	case SIGP_SENSE:
		vcpu->stat.instruction_sigp_sense++;
		rc = __sigp_sense(vcpu, cpu_addr,
				  &vcpu->arch.guest_gprs[r1]);
		break;
	case SIGP_EMERGENCY:
		vcpu->stat.instruction_sigp_emergency++;
		rc = __sigp_emergency(vcpu, cpu_addr);
		break;
	case SIGP_STOP:
		vcpu->stat.instruction_sigp_stop++;
		rc = __sigp_stop(vcpu, cpu_addr, 0);
		break;
	case SIGP_STOP_STORE_STATUS:
		vcpu->stat.instruction_sigp_stop++;
		rc = __sigp_stop(vcpu, cpu_addr, 1);
		break;
	case SIGP_SET_ARCH:
		vcpu->stat.instruction_sigp_arch++;
		rc = __sigp_set_arch(vcpu, parameter);
		break;
	case SIGP_SET_PREFIX:
		vcpu->stat.instruction_sigp_prefix++;
		rc = __sigp_set_prefix(vcpu, cpu_addr, parameter,
				       &vcpu->arch.guest_gprs[r1]);
		break;
	case SIGP_RESTART:
		vcpu->stat.instruction_sigp_restart++;
		/* user space must know about restart */
	default:
		return -ENOTSUPP;
	}

	if (rc < 0)
		return rc;

	vcpu->arch.sie_block->gpsw.mask &= ~(3ul << 44);
	vcpu->arch.sie_block->gpsw.mask |= (rc & 3ul) << 44;
	return 0;
}
Commit	Line	Data
5288fbf0 CB	1	/*
	2	* sigp.c - handlinge interprocessor communication
	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/kvm_host.h>
	16	#include "gaccess.h"
	17	#include "kvm-s390.h"
	18
	19	/* sigp order codes */
	20	#define SIGP_SENSE 0x01
	21	#define SIGP_EXTERNAL_CALL 0x02
	22	#define SIGP_EMERGENCY 0x03
	23	#define SIGP_START 0x04
	24	#define SIGP_STOP 0x05
	25	#define SIGP_RESTART 0x06
	26	#define SIGP_STOP_STORE_STATUS 0x09
	27	#define SIGP_INITIAL_CPU_RESET 0x0b
	28	#define SIGP_CPU_RESET 0x0c
	29	#define SIGP_SET_PREFIX 0x0d
	30	#define SIGP_STORE_STATUS_ADDR 0x0e
	31	#define SIGP_SET_ARCH 0x12
	32
	33	/* cpu status bits */
	34	#define SIGP_STAT_EQUIPMENT_CHECK 0x80000000UL
	35	#define SIGP_STAT_INCORRECT_STATE 0x00000200UL
	36	#define SIGP_STAT_INVALID_PARAMETER 0x00000100UL
	37	#define SIGP_STAT_EXT_CALL_PENDING 0x00000080UL
	38	#define SIGP_STAT_STOPPED 0x00000040UL
	39	#define SIGP_STAT_OPERATOR_INTERV 0x00000020UL
	40	#define SIGP_STAT_CHECK_STOP 0x00000010UL
	41	#define SIGP_STAT_INOPERATIVE 0x00000004UL
	42	#define SIGP_STAT_INVALID_ORDER 0x00000002UL
	43	#define SIGP_STAT_RECEIVER_CHECK 0x00000001UL
	44
	45
	46	static int __sigp_sense(struct kvm_vcpu vcpu, u16 cpu_addr, u64 reg)
	47	{
	48	struct float_interrupt *fi = &vcpu->kvm->arch.float_int;
	49	int rc;
	50
	51	if (cpu_addr >= KVM_MAX_VCPUS)
	52	return 3; /* not operational */
	53
	54	spin_lock_bh(&fi->lock);
	55	if (fi->local_int[cpu_addr] == NULL)
	56	rc = 3; /* not operational */
	57	else if (atomic_read(fi->local_int[cpu_addr]->cpuflags)
	58	& CPUSTAT_RUNNING) {
	59	*reg &= 0xffffffff00000000UL;
	60	rc = 1; /* status stored */
	61	} else {
	62	*reg &= 0xffffffff00000000UL;
	63	*reg \|= SIGP_STAT_STOPPED;
	64	rc = 1; /* status stored */
65	}
66	spin_unlock_bh(&fi->lock);
67
68	VCPU_EVENT(vcpu, 4, "sensed status of cpu %x rc %x", cpu_addr, rc);
69	return rc;
70	}
71
72	static int __sigp_emergency(struct kvm_vcpu *vcpu, u16 cpu_addr)
73	{
74	struct float_interrupt *fi = &vcpu->kvm->arch.float_int;
75	struct local_interrupt *li;
76	struct interrupt_info *inti;
77	int rc;
78
79	if (cpu_addr >= KVM_MAX_VCPUS)
80	return 3; /* not operational */
81
82	inti = kzalloc(sizeof(*inti), GFP_KERNEL);
83	if (!inti)
84	return -ENOMEM;
85
86	inti->type = KVM_S390_INT_EMERGENCY;
87
88	spin_lock_bh(&fi->lock);
89	li = fi->local_int[cpu_addr];
90	if (li == NULL) {
91	rc = 3; /* not operational */
92	kfree(inti);
93	goto unlock;
94	}
95	spin_lock_bh(&li->lock);
96	list_add_tail(&inti->list, &li->list);
97	atomic_set(&li->active, 1);
98	atomic_set_mask(CPUSTAT_EXT_INT, li->cpuflags);
99	if (waitqueue_active(&li->wq))
100	wake_up_interruptible(&li->wq);
101	spin_unlock_bh(&li->lock);
102	rc = 0; /* order accepted */
103	unlock:
104	spin_unlock_bh(&fi->lock);
105	VCPU_EVENT(vcpu, 4, "sent sigp emerg to cpu %x", cpu_addr);
106	return rc;
107	}
108
109	static int __sigp_stop(struct kvm_vcpu *vcpu, u16 cpu_addr, int store)
110	{
111	struct float_interrupt *fi = &vcpu->kvm->arch.float_int;
112	struct local_interrupt *li;
113	struct interrupt_info *inti;
114	int rc;
115
116	if (cpu_addr >= KVM_MAX_VCPUS)
117	return 3; /* not operational */
118
119	inti = kzalloc(sizeof(*inti), GFP_KERNEL);
120	if (!inti)
121	return -ENOMEM;
122
123	inti->type = KVM_S390_SIGP_STOP;
124
125	spin_lock_bh(&fi->lock);
126	li = fi->local_int[cpu_addr];
127	if (li == NULL) {
128	rc = 3; /* not operational */
129	kfree(inti);
130	goto unlock;
131	}
132	spin_lock_bh(&li->lock);
133	list_add_tail(&inti->list, &li->list);
134	atomic_set(&li->active, 1);
135	atomic_set_mask(CPUSTAT_STOP_INT, li->cpuflags);
136	if (store)
137	li->action_bits \|= ACTION_STORE_ON_STOP;
138	li->action_bits \|= ACTION_STOP_ON_STOP;
139	if (waitqueue_active(&li->wq))
140	wake_up_interruptible(&li->wq);
141	spin_unlock_bh(&li->lock);
142	rc = 0; /* order accepted */
143	unlock:
144	spin_unlock_bh(&fi->lock);
145	VCPU_EVENT(vcpu, 4, "sent sigp stop to cpu %x", cpu_addr);
146	return rc;
147	}
148
149	static int __sigp_set_arch(struct kvm_vcpu *vcpu, u32 parameter)
150	{
151	int rc;
152
153	switch (parameter & 0xff) {
154	case 0:
155	printk(KERN_WARNING "kvm: request to switch to ESA/390 mode"
156	" not supported");
157	rc = 3; /* not operational */
158	break;
159	case 1:
160	case 2:
161	rc = 0; /* order accepted */
162	break;
163	default:
164	rc = -ENOTSUPP;
165	}
166	return rc;
167	}
168
169	static int __sigp_set_prefix(struct kvm_vcpu *vcpu, u16 cpu_addr, u32 address,
170	u64 *reg)
171	{
172	struct float_interrupt *fi = &vcpu->kvm->arch.float_int;
173	struct local_interrupt *li;
174	struct interrupt_info *inti;
175	int rc;
176	u8 tmp;
177
178	/* make sure that the new value is valid memory */
179	address = address & 0x7fffe000u;
180	if ((copy_from_guest(vcpu, &tmp,
181	(u64) (address + vcpu->kvm->arch.guest_origin) , 1)) \|\|
182	(copy_from_guest(vcpu, &tmp, (u64) (address +
183	vcpu->kvm->arch.guest_origin + PAGE_SIZE), 1))) {
184	*reg \|= SIGP_STAT_INVALID_PARAMETER;
185	return 1; /* invalid parameter */
186	}
187
188	inti = kzalloc(sizeof(*inti), GFP_KERNEL);
189	if (!inti)
190	return 2; /* busy */
191
192	spin_lock_bh(&fi->lock);
193	li = fi->local_int[cpu_addr];
194
195	if ((cpu_addr >= KVM_MAX_VCPUS) \|\| (li == NULL)) {
196	rc = 1; /* incorrect state */
197	*reg &= SIGP_STAT_INCORRECT_STATE;
198	kfree(inti);
199	goto out_fi;
200	}
201
202	spin_lock_bh(&li->lock);
203	/* cpu must be in stopped state */
204	if (atomic_read(li->cpuflags) & CPUSTAT_RUNNING) {
205	rc = 1; /* incorrect state */
206	*reg &= SIGP_STAT_INCORRECT_STATE;
207	kfree(inti);
208	goto out_li;
209	}
210
211	inti->type = KVM_S390_SIGP_SET_PREFIX;
212	inti->prefix.address = address;
213
214	list_add_tail(&inti->list, &li->list);
215	atomic_set(&li->active, 1);
216	if (waitqueue_active(&li->wq))
217	wake_up_interruptible(&li->wq);
218	rc = 0; /* order accepted */
219
220	VCPU_EVENT(vcpu, 4, "set prefix of cpu %02x to %x", cpu_addr, address);
221	out_li:
222	spin_unlock_bh(&li->lock);
223	out_fi:
224	spin_unlock_bh(&fi->lock);
225	return rc;
226	}
227
228	int kvm_s390_handle_sigp(struct kvm_vcpu *vcpu)
229	{
230	int r1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
231	int r3 = vcpu->arch.sie_block->ipa & 0x000f;
232	int base2 = vcpu->arch.sie_block->ipb >> 28;
233	int disp2 = ((vcpu->arch.sie_block->ipb & 0x0fff0000) >> 16);
234	u32 parameter;
235	u16 cpu_addr = vcpu->arch.guest_gprs[r3];
236	u8 order_code;
237	int rc;
238
239	order_code = disp2;
240	if (base2)
241	order_code += vcpu->arch.guest_gprs[base2];
242
243	if (r1 % 2)
244	parameter = vcpu->arch.guest_gprs[r1];
245	else
246	parameter = vcpu->arch.guest_gprs[r1 + 1];
247
248	switch (order_code) {
249	case SIGP_SENSE:
250	vcpu->stat.instruction_sigp_sense++;
251	rc = __sigp_sense(vcpu, cpu_addr,
252	&vcpu->arch.guest_gprs[r1]);
253	break;
254	case SIGP_EMERGENCY:
255	vcpu->stat.instruction_sigp_emergency++;
256	rc = __sigp_emergency(vcpu, cpu_addr);
257	break;
258	case SIGP_STOP:
259	vcpu->stat.instruction_sigp_stop++;
260	rc = __sigp_stop(vcpu, cpu_addr, 0);
261	break;
262	case SIGP_STOP_STORE_STATUS:
263	vcpu->stat.instruction_sigp_stop++;
264	rc = __sigp_stop(vcpu, cpu_addr, 1);
265	break;
266	case SIGP_SET_ARCH:
267	vcpu->stat.instruction_sigp_arch++;
268	rc = __sigp_set_arch(vcpu, parameter);
269	break;
270	case SIGP_SET_PREFIX:
271	vcpu->stat.instruction_sigp_prefix++;
272	rc = __sigp_set_prefix(vcpu, cpu_addr, parameter,
273	&vcpu->arch.guest_gprs[r1]);
274	break;
275	case SIGP_RESTART:
276	vcpu->stat.instruction_sigp_restart++;
277	/* user space must know about restart */
278	default:
279	return -ENOTSUPP;
280	}
281
282	if (rc < 0)
283	return rc;
284
285	vcpu->arch.sie_block->gpsw.mask &= ~(3ul << 44);
286	vcpu->arch.sie_block->gpsw.mask \|= (rc & 3ul) << 44;
287	return 0;
288	}