[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;
	int base2 = vcpu->arch.sie_block->ipb >> 28;
	int disp2 = ((vcpu->arch.sie_block->ipb & 0x0fff0000) >> 16) +
			((vcpu->arch.sie_block->ipb & 0xff00) << 4);
	u64 useraddr;
	int reg, rc;

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

	useraddr = disp2;
	if (base2)
		useraddr += vcpu->run->s.regs.gprs[base2];

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

	reg = reg1;

	VCPU_EVENT(vcpu, 5, "lctlg r1:%x, r3:%x,b2:%x,d2:%x", reg1, reg3, base2,
		   disp2);
	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;
	int base2 = vcpu->arch.sie_block->ipb >> 28;
	int disp2 = ((vcpu->arch.sie_block->ipb & 0x0fff0000) >> 16);
	u64 useraddr;
	u32 val = 0;
	int reg, rc;

	vcpu->stat.instruction_lctl++;

	useraddr = disp2;
	if (base2)
		useraddr += vcpu->run->s.regs.gprs[base2];

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

	VCPU_EVENT(vcpu, 5, "lctl r1:%x, r3:%x,b2:%x,d2:%x", reg1, reg3, base2,
		   disp2);
	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 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;
	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
f5e10b09	35	vcpu->stat.instruction_lctlg++;
ba5c1e9b	36	if ((vcpu->arch.sie_block->ipb & 0xff) != 0x2f)
b8e660b8	37	return -EOPNOTSUPP;
ba5c1e9b CO	38
	39	useraddr = disp2;
	40	if (base2)
5a32c1af	41	useraddr += vcpu->run->s.regs.gprs[base2];
ba5c1e9b	42
5a00a5e7 CB	43	if (useraddr & 7)
	44	return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
	45
ba5c1e9b CO	46	reg = reg1;
ba5c1e9b CO	47
f5e10b09	48	VCPU_EVENT(vcpu, 5, "lctlg r1:%x, r3:%x,b2:%x,d2:%x", reg1, reg3, base2,
ba5c1e9b	49	disp2);
5786fffa	50	trace_kvm_s390_handle_lctl(vcpu, 1, reg1, reg3, useraddr);
ba5c1e9b CO	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)
5a32c1af	81	useraddr += vcpu->run->s.regs.gprs[base2];
ba5c1e9b	82
5a00a5e7 CB	83	if (useraddr & 3)
	84	return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
	85
ba5c1e9b CO	86	VCPU_EVENT(vcpu, 5, "lctl r1:%x, r3:%x,b2:%x,d2:%x", reg1, reg3, base2,
ba5c1e9b CO	87	disp2);
5786fffa	88	trace_kvm_s390_handle_lctl(vcpu, 0, reg1, reg3, useraddr);
ba5c1e9b CO	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] = {
8c3f61e2	108	[0x01] = kvm_s390_handle_01,
e28acfea	109	[0x83] = kvm_s390_handle_diag,
5288fbf0	110	[0xae] = kvm_s390_handle_sigp,
70455a36	111	[0xb2] = kvm_s390_handle_b2,
ba5c1e9b	112	[0xb7] = handle_lctl,
bb25b9ba	113	[0xe5] = kvm_s390_handle_e5,
f5e10b09	114	[0xeb] = handle_lctlg,
ba5c1e9b	115	};
8f2abe6a CB	116
	117	static int handle_noop(struct kvm_vcpu *vcpu)
	118	{
	119	switch (vcpu->arch.sie_block->icptcode) {
0eaeafa1 CB	120	case 0x0:
	121	vcpu->stat.exit_null++;
	122	break;
8f2abe6a CB	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	{
9ace903d	137	int rc = 0;
5288fbf0	138
8f2abe6a	139	vcpu->stat.exit_stop_request++;
5288fbf0	140	spin_lock_bh(&vcpu->arch.local_int.lock);
5288fbf0	141
ade38c31 CH	142	trace_kvm_s390_stop_request(vcpu->arch.local_int.action_bits);
ade38c31 CH	143
9ace903d CE	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
5288fbf0	150	if (vcpu->arch.local_int.action_bits & ACTION_STOP_ON_STOP) {
9e6dabef CH	151	atomic_set_mask(CPUSTAT_STOPPED,
9e6dabef CH	152	&vcpu->arch.sie_block->cpuflags);
5288fbf0 CB	153	vcpu->arch.local_int.action_bits &= ~ACTION_STOP_ON_STOP;
5288fbf0 CB	154	VCPU_EVENT(vcpu, 3, "%s", "cpu stopped");
b8e660b8	155	rc = -EOPNOTSUPP;
9ace903d CE	156	}
9ace903d CE	157
9e0d5473 JF	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);
5288fbf0	170	return rc;
8f2abe6a CB	171	}
	172
	173	static int handle_validity(struct kvm_vcpu *vcpu)
	174	{
598841ca	175	unsigned long vmaddr;
8f2abe6a	176	int viwhy = vcpu->arch.sie_block->ipb >> 16;
3edbcff9 CO	177	int rc;
3edbcff9 CO	178
8f2abe6a	179	vcpu->stat.exit_validity++;
5786fffa	180	trace_kvm_s390_intercept_validity(vcpu, viwhy);
092670cd CO	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);
598841ca	190	if (rc) {
3edbcff9	191	/* user will receive sigsegv, exit to user */
b8e660b8	192	rc = -EOPNOTSUPP;
598841ca CO	193	goto out;
598841ca CO	194	}
092670cd	195	vmaddr = gmap_fault(vcpu->arch.sie_block->prefix + PAGE_SIZE,
598841ca CO	196	vcpu->arch.gmap);
	197	if (IS_ERR_VALUE(vmaddr)) {
	198	rc = -EOPNOTSUPP;
	199	goto out;
	200	}
092670cd CO	201	rc = fault_in_pages_writeable((char __user *) vmaddr,
	202	PAGE_SIZE);
	203	if (rc) {
	204	/* user will receive sigsegv, exit to user */
598841ca CO	205	rc = -EOPNOTSUPP;
	206	goto out;
	207	}
3edbcff9	208	} else
b8e660b8	209	rc = -EOPNOTSUPP;
3edbcff9	210
598841ca	211	out:
3edbcff9 CO	212	if (rc)
	213	VCPU_EVENT(vcpu, 2, "unhandled validity intercept code %d",
	214	viwhy);
	215	return rc;
8f2abe6a CB	216	}
8f2abe6a CB	217
ba5c1e9b CO	218	static int handle_instruction(struct kvm_vcpu *vcpu)
	219	{
	220	intercept_handler_t handler;
	221
	222	vcpu->stat.exit_instruction++;
5786fffa CH	223	trace_kvm_s390_intercept_instruction(vcpu,
	224	vcpu->arch.sie_block->ipa,
	225	vcpu->arch.sie_block->ipb);
ba5c1e9b CO	226	handler = instruction_handlers[vcpu->arch.sie_block->ipa >> 8];
	227	if (handler)
	228	return handler(vcpu);
b8e660b8	229	return -EOPNOTSUPP;
ba5c1e9b CO	230	}
	231
	232	static int handle_prog(struct kvm_vcpu *vcpu)
	233	{
	234	vcpu->stat.exit_program_interruption++;
5786fffa	235	trace_kvm_s390_intercept_prog(vcpu, vcpu->arch.sie_block->iprcc);
ba5c1e9b CO	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
b8e660b8	247	if (rc == -EOPNOTSUPP)
ba5c1e9b CO	248	vcpu->arch.sie_block->icptcode = 0x04;
	249	if (rc)
	250	return rc;
	251	return rc2;
	252	}
	253
062d5e9b	254	static const intercept_handler_t intercept_funcs[] = {
8f2abe6a	255	[0x00 >> 2] = handle_noop,
ba5c1e9b CO	256	[0x04 >> 2] = handle_instruction,
	257	[0x08 >> 2] = handle_prog,
	258	[0x0C >> 2] = handle_instruction_and_prog,
8f2abe6a CB	259	[0x10 >> 2] = handle_noop,
8f2abe6a CB	260	[0x14 >> 2] = handle_noop,
ba5c1e9b	261	[0x1C >> 2] = kvm_s390_handle_wait,
8f2abe6a CB	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
062d5e9b	271	if (code & 3 \|\| (code >> 2) >= ARRAY_SIZE(intercept_funcs))
b8e660b8	272	return -EOPNOTSUPP;
8f2abe6a CB	273	func = intercept_funcs[code >> 2];
	274	if (func)
	275	return func(vcpu);
b8e660b8	276	return -EOPNOTSUPP;
8f2abe6a	277	}