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

/*
 * in-kernel handling for sie intercepts
 *
 * Copyright IBM Corp. 2008, 2009
 *
 * 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_host.h>
#include <linux/errno.h>
#include <linux/pagemap.h>

#include <asm/kvm_host.h>

#include "kvm-s390.h"
#include "gaccess.h"
#include "trace.h"
#include "trace-s390.h"

static int handle_lctlg(struct kvm_vcpu *vcpu)
{
	int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
	int reg3 = vcpu->arch.sie_block->ipa & 0x000f;
	u64 useraddr;
	int reg, rc;

	vcpu->stat.instruction_lctlg++;
	if ((vcpu->arch.sie_block->ipb & 0xff) != 0x2f)
		return -EOPNOTSUPP;

	useraddr = kvm_s390_get_base_disp_rsy(vcpu);

	if (useraddr & 7)
		return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);

	reg = reg1;

	VCPU_EVENT(vcpu, 5, "lctlg r1:%x, r3:%x, addr:%llx", reg1, reg3,
		   useraddr);
	trace_kvm_s390_handle_lctl(vcpu, 1, reg1, reg3, useraddr);

	do {
		rc = get_guest_u64(vcpu, useraddr,
				   &vcpu->arch.sie_block->gcr[reg]);
		if (rc == -EFAULT) {
			kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
			break;
		}
		useraddr += 8;
		if (reg == reg3)
			break;
		reg = (reg + 1) % 16;
	} while (1);
	return 0;
}

static int handle_lctl(struct kvm_vcpu *vcpu)
{
	int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
	int reg3 = vcpu->arch.sie_block->ipa & 0x000f;
	u64 useraddr;
	u32 val = 0;
	int reg, rc;

	vcpu->stat.instruction_lctl++;

	useraddr = kvm_s390_get_base_disp_rs(vcpu);

	if (useraddr & 3)
		return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);

	VCPU_EVENT(vcpu, 5, "lctl r1:%x, r3:%x, addr:%llx", reg1, reg3,
		   useraddr);
	trace_kvm_s390_handle_lctl(vcpu, 0, reg1, reg3, useraddr);

	reg = reg1;
	do {
		rc = get_guest_u32(vcpu, useraddr, &val);
		if (rc == -EFAULT) {
			kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
			break;
		}
		vcpu->arch.sie_block->gcr[reg] &= 0xffffffff00000000ul;
		vcpu->arch.sie_block->gcr[reg] |= val;
		useraddr += 4;
		if (reg == reg3)
			break;
		reg = (reg + 1) % 16;
	} while (1);
	return 0;
}

static const intercept_handler_t instruction_handlers[256] = {
	[0x01] = kvm_s390_handle_01,
	[0x83] = kvm_s390_handle_diag,
	[0xae] = kvm_s390_handle_sigp,
	[0xb2] = kvm_s390_handle_b2,
	[0xb7] = handle_lctl,
	[0xe5] = kvm_s390_handle_e5,
	[0xeb] = handle_lctlg,
};

static int handle_noop(struct kvm_vcpu *vcpu)
{
	switch (vcpu->arch.sie_block->icptcode) {
	case 0x0:
		vcpu->stat.exit_null++;
		break;
	case 0x10:
		vcpu->stat.exit_external_request++;
		break;
	case 0x14:
		vcpu->stat.exit_external_interrupt++;
		break;
	default:
		break; /* nothing */
	}
	return 0;
}

static int handle_stop(struct kvm_vcpu *vcpu)
{
	int rc = 0;

	vcpu->stat.exit_stop_request++;
	spin_lock_bh(&vcpu->arch.local_int.lock);

	trace_kvm_s390_stop_request(vcpu->arch.local_int.action_bits);

	if (vcpu->arch.local_int.action_bits & ACTION_RELOADVCPU_ON_STOP) {
		vcpu->arch.local_int.action_bits &= ~ACTION_RELOADVCPU_ON_STOP;
		rc = SIE_INTERCEPT_RERUNVCPU;
		vcpu->run->exit_reason = KVM_EXIT_INTR;
	}

	if (vcpu->arch.local_int.action_bits & ACTION_STOP_ON_STOP) {
		atomic_set_mask(CPUSTAT_STOPPED,
				&vcpu->arch.sie_block->cpuflags);
		vcpu->arch.local_int.action_bits &= ~ACTION_STOP_ON_STOP;
		VCPU_EVENT(vcpu, 3, "%s", "cpu stopped");
		rc = -EOPNOTSUPP;
	}

	if (vcpu->arch.local_int.action_bits & ACTION_STORE_ON_STOP) {
		vcpu->arch.local_int.action_bits &= ~ACTION_STORE_ON_STOP;
		/* store status must be called unlocked. Since local_int.lock
		 * only protects local_int.* and not guest memory we can give
		 * up the lock here */
		spin_unlock_bh(&vcpu->arch.local_int.lock);
		rc = kvm_s390_vcpu_store_status(vcpu,
						KVM_S390_STORE_STATUS_NOADDR);
		if (rc >= 0)
			rc = -EOPNOTSUPP;
	} else
		spin_unlock_bh(&vcpu->arch.local_int.lock);
	return rc;
}

static int handle_validity(struct kvm_vcpu *vcpu)
{
	unsigned long vmaddr;
	int viwhy = vcpu->arch.sie_block->ipb >> 16;
	int rc;

	vcpu->stat.exit_validity++;
	trace_kvm_s390_intercept_validity(vcpu, viwhy);
	if (viwhy == 0x37) {
		vmaddr = gmap_fault(vcpu->arch.sie_block->prefix,
				    vcpu->arch.gmap);
		if (IS_ERR_VALUE(vmaddr)) {
			rc = -EOPNOTSUPP;
			goto out;
		}
		rc = fault_in_pages_writeable((char __user *) vmaddr,
			 PAGE_SIZE);
		if (rc) {
			/* user will receive sigsegv, exit to user */
			rc = -EOPNOTSUPP;
			goto out;
		}
		vmaddr = gmap_fault(vcpu->arch.sie_block->prefix + PAGE_SIZE,
				    vcpu->arch.gmap);
		if (IS_ERR_VALUE(vmaddr)) {
			rc = -EOPNOTSUPP;
			goto out;
		}
		rc = fault_in_pages_writeable((char __user *) vmaddr,
			 PAGE_SIZE);
		if (rc) {
			/* user will receive sigsegv, exit to user */
			rc = -EOPNOTSUPP;
			goto out;
		}
	} else
		rc = -EOPNOTSUPP;

out:
	if (rc)
		VCPU_EVENT(vcpu, 2, "unhandled validity intercept code %d",
			   viwhy);
	return rc;
}

static int handle_instruction(struct kvm_vcpu *vcpu)
{
	intercept_handler_t handler;

	vcpu->stat.exit_instruction++;
	trace_kvm_s390_intercept_instruction(vcpu,
					     vcpu->arch.sie_block->ipa,
					     vcpu->arch.sie_block->ipb);
	handler = instruction_handlers[vcpu->arch.sie_block->ipa >> 8];
	if (handler)
		return handler(vcpu);
	return -EOPNOTSUPP;
}

static int handle_prog(struct kvm_vcpu *vcpu)
{
	vcpu->stat.exit_program_interruption++;
	trace_kvm_s390_intercept_prog(vcpu, vcpu->arch.sie_block->iprcc);
	return kvm_s390_inject_program_int(vcpu, vcpu->arch.sie_block->iprcc);
}

static int handle_instruction_and_prog(struct kvm_vcpu *vcpu)
{
	int rc, rc2;

	vcpu->stat.exit_instr_and_program++;
	rc = handle_instruction(vcpu);
	rc2 = handle_prog(vcpu);

	if (rc == -EOPNOTSUPP)
		vcpu->arch.sie_block->icptcode = 0x04;
	if (rc)
		return rc;
	return rc2;
}

static const intercept_handler_t intercept_funcs[] = {
	[0x00 >> 2] = handle_noop,
	[0x04 >> 2] = handle_instruction,
	[0x08 >> 2] = handle_prog,
	[0x0C >> 2] = handle_instruction_and_prog,
	[0x10 >> 2] = handle_noop,
	[0x14 >> 2] = handle_noop,
	[0x1C >> 2] = kvm_s390_handle_wait,
	[0x20 >> 2] = handle_validity,
	[0x28 >> 2] = handle_stop,
};

int kvm_handle_sie_intercept(struct kvm_vcpu *vcpu)
{
	intercept_handler_t func;
	u8 code = vcpu->arch.sie_block->icptcode;

	if (code & 3 || (code >> 2) >= ARRAY_SIZE(intercept_funcs))
		return -EOPNOTSUPP;
	func = intercept_funcs[code >> 2];
	if (func)
		return func(vcpu);
	return -EOPNOTSUPP;
}
Commit	Line	Data
8f2abe6a	1	/*
a53c8fab	2	* in-kernel handling for sie intercepts
8f2abe6a	3	*
a53c8fab	4	* Copyright IBM Corp. 2008, 2009
8f2abe6a CB	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_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"
ba5c1e9b	21	#include "gaccess.h"
5786fffa	22	#include "trace.h"
ade38c31	23	#include "trace-s390.h"
ba5c1e9b	24
f5e10b09	25	static int handle_lctlg(struct kvm_vcpu *vcpu)
ba5c1e9b CO	26	{
	27	int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
	28	int reg3 = vcpu->arch.sie_block->ipa & 0x000f;
ba5c1e9b CO	29	u64 useraddr;
	30	int reg, rc;
	31
f5e10b09	32	vcpu->stat.instruction_lctlg++;
ba5c1e9b	33	if ((vcpu->arch.sie_block->ipb & 0xff) != 0x2f)
b8e660b8	34	return -EOPNOTSUPP;
ba5c1e9b	35
b1c571a5	36	useraddr = kvm_s390_get_base_disp_rsy(vcpu);
ba5c1e9b	37
5a00a5e7 CB	38	if (useraddr & 7)
	39	return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
	40
ba5c1e9b CO	41	reg = reg1;
ba5c1e9b CO	42
b1c571a5 CH	43	VCPU_EVENT(vcpu, 5, "lctlg r1:%x, r3:%x, addr:%llx", reg1, reg3,
b1c571a5 CH	44	useraddr);
5786fffa	45	trace_kvm_s390_handle_lctl(vcpu, 1, reg1, reg3, useraddr);
ba5c1e9b CO	46
	47	do {
	48	rc = get_guest_u64(vcpu, useraddr,
	49	&vcpu->arch.sie_block->gcr[reg]);
	50	if (rc == -EFAULT) {
	51	kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
	52	break;
	53	}
	54	useraddr += 8;
	55	if (reg == reg3)
	56	break;
	57	reg = (reg + 1) % 16;
	58	} while (1);
	59	return 0;
	60	}
	61
	62	static int handle_lctl(struct kvm_vcpu *vcpu)
	63	{
	64	int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
	65	int reg3 = vcpu->arch.sie_block->ipa & 0x000f;
ba5c1e9b CO	66	u64 useraddr;
	67	u32 val = 0;
	68	int reg, rc;
	69
	70	vcpu->stat.instruction_lctl++;
	71
b1c571a5	72	useraddr = kvm_s390_get_base_disp_rs(vcpu);
ba5c1e9b	73
5a00a5e7 CB	74	if (useraddr & 3)
	75	return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
	76
b1c571a5 CH	77	VCPU_EVENT(vcpu, 5, "lctl r1:%x, r3:%x, addr:%llx", reg1, reg3,
b1c571a5 CH	78	useraddr);
5786fffa	79	trace_kvm_s390_handle_lctl(vcpu, 0, reg1, reg3, useraddr);
ba5c1e9b CO	80
	81	reg = reg1;
	82	do {
	83	rc = get_guest_u32(vcpu, useraddr, &val);
	84	if (rc == -EFAULT) {
	85	kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
	86	break;
	87	}
	88	vcpu->arch.sie_block->gcr[reg] &= 0xffffffff00000000ul;
	89	vcpu->arch.sie_block->gcr[reg] \|= val;
	90	useraddr += 4;
	91	if (reg == reg3)
	92	break;
	93	reg = (reg + 1) % 16;
	94	} while (1);
	95	return 0;
	96	}
	97
77975357	98	static const intercept_handler_t instruction_handlers[256] = {
8c3f61e2	99	[0x01] = kvm_s390_handle_01,
e28acfea	100	[0x83] = kvm_s390_handle_diag,
5288fbf0	101	[0xae] = kvm_s390_handle_sigp,
70455a36	102	[0xb2] = kvm_s390_handle_b2,
ba5c1e9b	103	[0xb7] = handle_lctl,
bb25b9ba	104	[0xe5] = kvm_s390_handle_e5,
f5e10b09	105	[0xeb] = handle_lctlg,
ba5c1e9b	106	};
8f2abe6a CB	107
	108	static int handle_noop(struct kvm_vcpu *vcpu)
	109	{
	110	switch (vcpu->arch.sie_block->icptcode) {
0eaeafa1 CB	111	case 0x0:
	112	vcpu->stat.exit_null++;
	113	break;
8f2abe6a CB	114	case 0x10:
	115	vcpu->stat.exit_external_request++;
	116	break;
	117	case 0x14:
	118	vcpu->stat.exit_external_interrupt++;
	119	break;
	120	default:
	121	break; /* nothing */
	122	}
	123	return 0;
	124	}
	125
	126	static int handle_stop(struct kvm_vcpu *vcpu)
	127	{
9ace903d	128	int rc = 0;
5288fbf0	129
8f2abe6a	130	vcpu->stat.exit_stop_request++;
5288fbf0	131	spin_lock_bh(&vcpu->arch.local_int.lock);
5288fbf0	132
ade38c31 CH	133	trace_kvm_s390_stop_request(vcpu->arch.local_int.action_bits);
ade38c31 CH	134
9ace903d CE	135	if (vcpu->arch.local_int.action_bits & ACTION_RELOADVCPU_ON_STOP) {
	136	vcpu->arch.local_int.action_bits &= ~ACTION_RELOADVCPU_ON_STOP;
	137	rc = SIE_INTERCEPT_RERUNVCPU;
	138	vcpu->run->exit_reason = KVM_EXIT_INTR;
	139	}
	140
5288fbf0	141	if (vcpu->arch.local_int.action_bits & ACTION_STOP_ON_STOP) {
9e6dabef CH	142	atomic_set_mask(CPUSTAT_STOPPED,
9e6dabef CH	143	&vcpu->arch.sie_block->cpuflags);
5288fbf0 CB	144	vcpu->arch.local_int.action_bits &= ~ACTION_STOP_ON_STOP;
5288fbf0 CB	145	VCPU_EVENT(vcpu, 3, "%s", "cpu stopped");
b8e660b8	146	rc = -EOPNOTSUPP;
9ace903d CE	147	}
9ace903d CE	148
9e0d5473 JF	149	if (vcpu->arch.local_int.action_bits & ACTION_STORE_ON_STOP) {
	150	vcpu->arch.local_int.action_bits &= ~ACTION_STORE_ON_STOP;
	151	/* store status must be called unlocked. Since local_int.lock
	152	* only protects local_int.* and not guest memory we can give
	153	* up the lock here */
	154	spin_unlock_bh(&vcpu->arch.local_int.lock);
	155	rc = kvm_s390_vcpu_store_status(vcpu,
	156	KVM_S390_STORE_STATUS_NOADDR);
	157	if (rc >= 0)
	158	rc = -EOPNOTSUPP;
	159	} else
	160	spin_unlock_bh(&vcpu->arch.local_int.lock);
5288fbf0	161	return rc;
8f2abe6a CB	162	}
	163
	164	static int handle_validity(struct kvm_vcpu *vcpu)
	165	{
598841ca	166	unsigned long vmaddr;
8f2abe6a	167	int viwhy = vcpu->arch.sie_block->ipb >> 16;
3edbcff9 CO	168	int rc;
3edbcff9 CO	169
8f2abe6a	170	vcpu->stat.exit_validity++;
5786fffa	171	trace_kvm_s390_intercept_validity(vcpu, viwhy);
092670cd CO	172	if (viwhy == 0x37) {
	173	vmaddr = gmap_fault(vcpu->arch.sie_block->prefix,
	174	vcpu->arch.gmap);
	175	if (IS_ERR_VALUE(vmaddr)) {
	176	rc = -EOPNOTSUPP;
	177	goto out;
	178	}
	179	rc = fault_in_pages_writeable((char __user *) vmaddr,
	180	PAGE_SIZE);
598841ca	181	if (rc) {
3edbcff9	182	/* user will receive sigsegv, exit to user */
b8e660b8	183	rc = -EOPNOTSUPP;
598841ca CO	184	goto out;
598841ca CO	185	}
092670cd	186	vmaddr = gmap_fault(vcpu->arch.sie_block->prefix + PAGE_SIZE,
598841ca CO	187	vcpu->arch.gmap);
	188	if (IS_ERR_VALUE(vmaddr)) {
	189	rc = -EOPNOTSUPP;
	190	goto out;
	191	}
092670cd CO	192	rc = fault_in_pages_writeable((char __user *) vmaddr,
	193	PAGE_SIZE);
	194	if (rc) {
	195	/* user will receive sigsegv, exit to user */
598841ca CO	196	rc = -EOPNOTSUPP;
	197	goto out;
	198	}
3edbcff9	199	} else
b8e660b8	200	rc = -EOPNOTSUPP;
3edbcff9	201
598841ca	202	out:
3edbcff9 CO	203	if (rc)
	204	VCPU_EVENT(vcpu, 2, "unhandled validity intercept code %d",
	205	viwhy);
	206	return rc;
8f2abe6a CB	207	}
8f2abe6a CB	208
ba5c1e9b CO	209	static int handle_instruction(struct kvm_vcpu *vcpu)
	210	{
	211	intercept_handler_t handler;
	212
	213	vcpu->stat.exit_instruction++;
5786fffa CH	214	trace_kvm_s390_intercept_instruction(vcpu,
	215	vcpu->arch.sie_block->ipa,
	216	vcpu->arch.sie_block->ipb);
ba5c1e9b CO	217	handler = instruction_handlers[vcpu->arch.sie_block->ipa >> 8];
	218	if (handler)
	219	return handler(vcpu);
b8e660b8	220	return -EOPNOTSUPP;
ba5c1e9b CO	221	}
	222
	223	static int handle_prog(struct kvm_vcpu *vcpu)
	224	{
	225	vcpu->stat.exit_program_interruption++;
5786fffa	226	trace_kvm_s390_intercept_prog(vcpu, vcpu->arch.sie_block->iprcc);
ba5c1e9b CO	227	return kvm_s390_inject_program_int(vcpu, vcpu->arch.sie_block->iprcc);
	228	}
	229
	230	static int handle_instruction_and_prog(struct kvm_vcpu *vcpu)
	231	{
	232	int rc, rc2;
	233
	234	vcpu->stat.exit_instr_and_program++;
	235	rc = handle_instruction(vcpu);
	236	rc2 = handle_prog(vcpu);
	237
b8e660b8	238	if (rc == -EOPNOTSUPP)
ba5c1e9b CO	239	vcpu->arch.sie_block->icptcode = 0x04;
	240	if (rc)
	241	return rc;
	242	return rc2;
	243	}
	244
062d5e9b	245	static const intercept_handler_t intercept_funcs[] = {
8f2abe6a	246	[0x00 >> 2] = handle_noop,
ba5c1e9b CO	247	[0x04 >> 2] = handle_instruction,
	248	[0x08 >> 2] = handle_prog,
	249	[0x0C >> 2] = handle_instruction_and_prog,
8f2abe6a CB	250	[0x10 >> 2] = handle_noop,
8f2abe6a CB	251	[0x14 >> 2] = handle_noop,
ba5c1e9b	252	[0x1C >> 2] = kvm_s390_handle_wait,
8f2abe6a CB	253	[0x20 >> 2] = handle_validity,
	254	[0x28 >> 2] = handle_stop,
	255	};
	256
	257	int kvm_handle_sie_intercept(struct kvm_vcpu *vcpu)
	258	{
	259	intercept_handler_t func;
	260	u8 code = vcpu->arch.sie_block->icptcode;
	261
062d5e9b	262	if (code & 3 \|\| (code >> 2) >= ARRAY_SIZE(intercept_funcs))
b8e660b8	263	return -EOPNOTSUPP;
8f2abe6a CB	264	func = intercept_funcs[code >> 2];
	265	if (func)
	266	return func(vcpu);
b8e660b8	267	return -EOPNOTSUPP;
8f2abe6a	268	}