target-s390x/kvm.c - third_party/qemu - Git at Google

 /*
  * QEMU S390x KVM implementation
  *
  * Copyright (c) 2009 Alexander Graf <agraf@suse.de>
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Lesser General Public License for more details.
  *
  * You should have received a copy of the GNU Lesser General Public
  * License along with this library; if not, see <http://www.gnu.org/licenses/>.
  */

 #include <sys/types.h>
 #include <sys/ioctl.h>
 #include <sys/mman.h>

 #include <linux/kvm.h>
 #include <asm/ptrace.h>

 #include "qemu-common.h"
 #include "qemu-timer.h"
 #include "sysemu.h"
 #include "kvm.h"
 #include "cpu.h"
 #include "device_tree.h"

 /* #define DEBUG_KVM */

 #ifdef DEBUG_KVM
 #define dprintf(fmt, ...) \
     do { fprintf(stderr, fmt, ## __VA_ARGS__); } while (0)
 #else
 #define dprintf(fmt, ...) \
     do { } while (0)
 #endif

 #define IPA0_DIAG                       0x8300
 #define IPA0_SIGP                       0xae00
 #define IPA0_PRIV                       0xb200

 #define PRIV_SCLP_CALL                  0x20
 #define DIAG_KVM_HYPERCALL              0x500
 #define DIAG_KVM_BREAKPOINT             0x501

 #define ICPT_INSTRUCTION                0x04
 #define ICPT_WAITPSW                    0x1c
 #define ICPT_SOFT_INTERCEPT             0x24
 #define ICPT_CPU_STOP                   0x28
 #define ICPT_IO                         0x40

 #define SIGP_RESTART                    0x06
 #define SIGP_INITIAL_CPU_RESET          0x0b
 #define SIGP_STORE_STATUS_ADDR          0x0e
 #define SIGP_SET_ARCH                   0x12

 #define SCLP_CMDW_READ_SCP_INFO         0x00020001
 #define SCLP_CMDW_READ_SCP_INFO_FORCED  0x00120001

 const KVMCapabilityInfo kvm_arch_required_capabilities[] = {
     KVM_CAP_LAST_INFO
 };

 int kvm_arch_init(KVMState *s)
 {
     return 0;
 }

 int kvm_arch_init_vcpu(CPUState *env)
 {
     int ret = 0;

     if (kvm_vcpu_ioctl(env, KVM_S390_INITIAL_RESET, NULL) < 0) {
         perror("cannot init reset vcpu");
     }

     return ret;
 }

 void kvm_arch_reset_vcpu(CPUState *env)
 {
     /* FIXME: add code to reset vcpu. */
 }

 int kvm_arch_put_registers(CPUState *env, int level)
 {
     struct kvm_regs regs;
     int ret;
     int i;

     ret = kvm_vcpu_ioctl(env, KVM_GET_REGS, &regs);
     if (ret < 0) {
         return ret;
     }

     for (i = 0; i < 16; i++) {
         regs.gprs[i] = env->regs[i];
     }

     ret = kvm_vcpu_ioctl(env, KVM_SET_REGS, &regs);
     if (ret < 0) {
         return ret;
     }

     env->kvm_run->psw_addr = env->psw.addr;
     env->kvm_run->psw_mask = env->psw.mask;

     return ret;
 }

 int kvm_arch_get_registers(CPUState *env)
 {
     int ret;
     struct kvm_regs regs;
     int i;

     ret = kvm_vcpu_ioctl(env, KVM_GET_REGS, &regs);
     if (ret < 0) {
         return ret;
     }

     for (i = 0; i < 16; i++) {
         env->regs[i] = regs.gprs[i];
     }

     env->psw.addr = env->kvm_run->psw_addr;
     env->psw.mask = env->kvm_run->psw_mask;

     return 0;
 }

 int kvm_arch_insert_sw_breakpoint(CPUState *env, struct kvm_sw_breakpoint *bp)
 {
     static const uint8_t diag_501[] = {0x83, 0x24, 0x05, 0x01};

     if (cpu_memory_rw_debug(env, bp->pc, (uint8_t *)&bp->saved_insn, 4, 0) ||
         cpu_memory_rw_debug(env, bp->pc, (uint8_t *)diag_501, 4, 1)) {
         return -EINVAL;
     }
     return 0;
 }

 int kvm_arch_remove_sw_breakpoint(CPUState *env, struct kvm_sw_breakpoint *bp)
 {
     uint8_t t[4];
     static const uint8_t diag_501[] = {0x83, 0x24, 0x05, 0x01};

     if (cpu_memory_rw_debug(env, bp->pc, t, 4, 0)) {
         return -EINVAL;
     } else if (memcmp(t, diag_501, 4)) {
         return -EINVAL;
     } else if (cpu_memory_rw_debug(env, bp->pc, (uint8_t *)&bp->saved_insn, 1, 1)) {
         return -EINVAL;
     }

     return 0;
 }

 void kvm_arch_pre_run(CPUState *env, struct kvm_run *run)
 {
 }

 void kvm_arch_post_run(CPUState *env, struct kvm_run *run)
 {
 }

 int kvm_arch_process_async_events(CPUState *env)
 {
     return env->halted;
 }

 void kvm_s390_interrupt_internal(CPUState *env, int type, uint32_t parm,
                                  uint64_t parm64, int vm)
 {
     struct kvm_s390_interrupt kvmint;
     int r;

     if (!env->kvm_state) {
         return;
     }

     env->halted = 0;
     env->exception_index = -1;
     qemu_cpu_kick(env);

     kvmint.type = type;
     kvmint.parm = parm;
     kvmint.parm64 = parm64;

     if (vm) {
         r = kvm_vm_ioctl(env->kvm_state, KVM_S390_INTERRUPT, &kvmint);
     } else {
         r = kvm_vcpu_ioctl(env, KVM_S390_INTERRUPT, &kvmint);
     }

     if (r < 0) {
         fprintf(stderr, "KVM failed to inject interrupt\n");
         exit(1);
     }
 }

 void kvm_s390_virtio_irq(CPUState *env, int config_change, uint64_t token)
 {
     kvm_s390_interrupt_internal(env, KVM_S390_INT_VIRTIO, config_change,
                                 token, 1);
 }

 void kvm_s390_interrupt(CPUState *env, int type, uint32_t code)
 {
     kvm_s390_interrupt_internal(env, type, code, 0, 0);
 }

 static void enter_pgmcheck(CPUState *env, uint16_t code)
 {
     kvm_s390_interrupt(env, KVM_S390_PROGRAM_INT, code);
 }

 static inline void setcc(CPUState *env, uint64_t cc)
 {
     env->kvm_run->psw_mask &= ~(3ull << 44);
     env->kvm_run->psw_mask |= (cc & 3) << 44;

     env->psw.mask &= ~(3ul << 44);
     env->psw.mask |= (cc & 3) << 44;
 }

 static int kvm_sclp_service_call(CPUState *env, struct kvm_run *run,
                                  uint16_t ipbh0)
 {
     uint32_t sccb;
     uint64_t code;
     int r = 0;

     cpu_synchronize_state(env);
     sccb = env->regs[ipbh0 & 0xf];
     code = env->regs[(ipbh0 & 0xf0) >> 4];

     r = sclp_service_call(env, sccb, code);
     if (r) {
         setcc(env, 3);
     }

     return 0;
 }

 static int handle_priv(CPUState *env, struct kvm_run *run, uint8_t ipa1)
 {
     int r = 0;
     uint16_t ipbh0 = (run->s390_sieic.ipb & 0xffff0000) >> 16;

     dprintf("KVM: PRIV: %d\n", ipa1);
     switch (ipa1) {
         case PRIV_SCLP_CALL:
             r = kvm_sclp_service_call(env, run, ipbh0);
             break;
         default:
             dprintf("KVM: unknown PRIV: 0x%x\n", ipa1);
             r = -1;
             break;
     }

     return r;
 }

 static int handle_hypercall(CPUState *env, struct kvm_run *run)
 {
     cpu_synchronize_state(env);
     env->regs[2] = s390_virtio_hypercall(env, env->regs[2], env->regs[1]);

     return 0;
 }

 static int handle_diag(CPUState *env, struct kvm_run *run, int ipb_code)
 {
     int r = 0;

     switch (ipb_code) {
         case DIAG_KVM_HYPERCALL:
             r = handle_hypercall(env, run);
             break;
         case DIAG_KVM_BREAKPOINT:
             sleep(10);
             break;
         default:
             dprintf("KVM: unknown DIAG: 0x%x\n", ipb_code);
             r = -1;
             break;
     }

     return r;
 }

 static int s390_cpu_restart(CPUState *env)
 {
     kvm_s390_interrupt(env, KVM_S390_RESTART, 0);
     env->halted = 0;
     env->exception_index = -1;
     qemu_cpu_kick(env);
     dprintf("DONE: SIGP cpu restart: %p\n", env);
     return 0;
 }

 static int s390_store_status(CPUState *env, uint32_t parameter)
 {
     /* XXX */
     fprintf(stderr, "XXX SIGP store status\n");
     return -1;
 }

 static int s390_cpu_initial_reset(CPUState *env)
 {
     int i;

     if (kvm_vcpu_ioctl(env, KVM_S390_INITIAL_RESET, NULL) < 0) {
         perror("cannot init reset vcpu");
     }

     /* Manually zero out all registers */
     cpu_synchronize_state(env);
     for (i = 0; i < 16; i++) {
         env->regs[i] = 0;
     }

     dprintf("DONE: SIGP initial reset: %p\n", env);
     return 0;
 }

 static int handle_sigp(CPUState *env, struct kvm_run *run, uint8_t ipa1)
 {
     uint8_t order_code;
     uint32_t parameter;
     uint16_t cpu_addr;
     uint8_t t;
     int r = -1;
     CPUState *target_env;

     cpu_synchronize_state(env);

     /* get order code */
     order_code = run->s390_sieic.ipb >> 28;
     if (order_code > 0) {
         order_code = env->regs[order_code];
     }
     order_code += (run->s390_sieic.ipb & 0x0fff0000) >> 16;

     /* get parameters */
     t = (ipa1 & 0xf0) >> 4;
     if (!(t % 2)) {
         t++;
     }

     parameter = env->regs[t] & 0x7ffffe00;
     cpu_addr = env->regs[ipa1 & 0x0f];

     target_env = s390_cpu_addr2state(cpu_addr);
     if (!target_env) {
         goto out;
     }

     switch (order_code) {
         case SIGP_RESTART:
             r = s390_cpu_restart(target_env);
             break;
         case SIGP_STORE_STATUS_ADDR:
             r = s390_store_status(target_env, parameter);
             break;
         case SIGP_SET_ARCH:
             /* make the caller panic */
             return -1;
         case SIGP_INITIAL_CPU_RESET:
             r = s390_cpu_initial_reset(target_env);
             break;
         default:
             fprintf(stderr, "KVM: unknown SIGP: 0x%x\n", order_code);
             break;
     }

 out:
     setcc(env, r ? 3 : 0);
     return 0;
 }

 static int handle_instruction(CPUState *env, struct kvm_run *run)
 {
     unsigned int ipa0 = (run->s390_sieic.ipa & 0xff00);
     uint8_t ipa1 = run->s390_sieic.ipa & 0x00ff;
     int ipb_code = (run->s390_sieic.ipb & 0x0fff0000) >> 16;
     int r = -1;

     dprintf("handle_instruction 0x%x 0x%x\n", run->s390_sieic.ipa, run->s390_sieic.ipb);
     switch (ipa0) {
         case IPA0_PRIV:
             r = handle_priv(env, run, ipa1);
             break;
         case IPA0_DIAG:
             r = handle_diag(env, run, ipb_code);
             break;
         case IPA0_SIGP:
             r = handle_sigp(env, run, ipa1);
             break;
     }

     if (r < 0) {
         enter_pgmcheck(env, 0x0001);
     }
     return 0;
 }

 static int handle_intercept(CPUState *env)
 {
     struct kvm_run *run = env->kvm_run;
     int icpt_code = run->s390_sieic.icptcode;
     int r = 0;

     dprintf("intercept: 0x%x (at 0x%lx)\n", icpt_code,
             (long)env->kvm_run->psw_addr);
     switch (icpt_code) {
         case ICPT_INSTRUCTION:
             r = handle_instruction(env, run);
             break;
         case ICPT_WAITPSW:
             /* XXX What to do on system shutdown? */
             env->halted = 1;
             env->exception_index = EXCP_HLT;
             break;
         case ICPT_SOFT_INTERCEPT:
             fprintf(stderr, "KVM unimplemented icpt SOFT\n");
             exit(1);
             break;
         case ICPT_CPU_STOP:
             qemu_system_shutdown_request();
             break;
         case ICPT_IO:
             fprintf(stderr, "KVM unimplemented icpt IO\n");
             exit(1);
             break;
         default:
             fprintf(stderr, "Unknown intercept code: %d\n", icpt_code);
             exit(1);
             break;
     }

     return r;
 }

 int kvm_arch_handle_exit(CPUState *env, struct kvm_run *run)
 {
     int ret = 0;

     switch (run->exit_reason) {
         case KVM_EXIT_S390_SIEIC:
             ret = handle_intercept(env);
             break;
         case KVM_EXIT_S390_RESET:
             fprintf(stderr, "RESET not implemented\n");
             exit(1);
             break;
         default:
             fprintf(stderr, "Unknown KVM exit: %d\n", run->exit_reason);
             break;
     }

     if (ret == 0) {
         ret = EXCP_INTERRUPT;
     } else if (ret > 0) {
         ret = 0;
     }
     return ret;
 }

 bool kvm_arch_stop_on_emulation_error(CPUState *env)
 {
     return true;
 }

 int kvm_arch_on_sigbus_vcpu(CPUState *env, int code, void *addr)
 {
     return 1;
 }

 int kvm_arch_on_sigbus(int code, void *addr)
 {
     return 1;
 }
	/*
	* QEMU S390x KVM implementation
	*
	* Copyright (c) 2009 Alexander Graf <agraf@suse.de>
	*
	* This library is free software; you can redistribute it and/or
	* modify it under the terms of the GNU Lesser General Public
	* License as published by the Free Software Foundation; either
	* version 2 of the License, or (at your option) any later version.
	*
	* This library is distributed in the hope that it will be useful,
	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	* Lesser General Public License for more details.
	*
	* You should have received a copy of the GNU Lesser General Public
	* License along with this library; if not, see <http://www.gnu.org/licenses/>.
	*/

	#include <sys/types.h>
	#include <sys/ioctl.h>
	#include <sys/mman.h>

	#include <linux/kvm.h>
	#include <asm/ptrace.h>

	#include "qemu-common.h"
	#include "qemu-timer.h"
	#include "sysemu.h"
	#include "kvm.h"
	#include "cpu.h"
	#include "device_tree.h"

	/* #define DEBUG_KVM */

	#ifdef DEBUG_KVM
	#define dprintf(fmt, ...) \
	do { fprintf(stderr, fmt, ## __VA_ARGS__); } while (0)
	#else
	#define dprintf(fmt, ...) \
	do { } while (0)
	#endif

	#define IPA0_DIAG 0x8300
	#define IPA0_SIGP 0xae00
	#define IPA0_PRIV 0xb200

	#define PRIV_SCLP_CALL 0x20
	#define DIAG_KVM_HYPERCALL 0x500
	#define DIAG_KVM_BREAKPOINT 0x501

	#define ICPT_INSTRUCTION 0x04
	#define ICPT_WAITPSW 0x1c
	#define ICPT_SOFT_INTERCEPT 0x24
	#define ICPT_CPU_STOP 0x28
	#define ICPT_IO 0x40

	#define SIGP_RESTART 0x06
	#define SIGP_INITIAL_CPU_RESET 0x0b
	#define SIGP_STORE_STATUS_ADDR 0x0e
	#define SIGP_SET_ARCH 0x12

	#define SCLP_CMDW_READ_SCP_INFO 0x00020001
	#define SCLP_CMDW_READ_SCP_INFO_FORCED 0x00120001

	const KVMCapabilityInfo kvm_arch_required_capabilities[] = {
	KVM_CAP_LAST_INFO
	};

	int kvm_arch_init(KVMState *s)
	{
	return 0;
	}

	int kvm_arch_init_vcpu(CPUState *env)
	{
	int ret = 0;

	if (kvm_vcpu_ioctl(env, KVM_S390_INITIAL_RESET, NULL) < 0) {
	perror("cannot init reset vcpu");
	}

	return ret;
	}

	void kvm_arch_reset_vcpu(CPUState *env)
	{
	/* FIXME: add code to reset vcpu. */
	}

	int kvm_arch_put_registers(CPUState *env, int level)
	{
	struct kvm_regs regs;
	int ret;
	int i;

	ret = kvm_vcpu_ioctl(env, KVM_GET_REGS, &regs);
	if (ret < 0) {
	return ret;
	}

	for (i = 0; i < 16; i++) {
	regs.gprs[i] = env->regs[i];
	}

	ret = kvm_vcpu_ioctl(env, KVM_SET_REGS, &regs);
	if (ret < 0) {
	return ret;
	}

	env->kvm_run->psw_addr = env->psw.addr;
	env->kvm_run->psw_mask = env->psw.mask;

	return ret;
	}

	int kvm_arch_get_registers(CPUState *env)
	{
	int ret;
	struct kvm_regs regs;
	int i;

	ret = kvm_vcpu_ioctl(env, KVM_GET_REGS, &regs);
	if (ret < 0) {
	return ret;
	}

	for (i = 0; i < 16; i++) {
	env->regs[i] = regs.gprs[i];
	}

	env->psw.addr = env->kvm_run->psw_addr;
	env->psw.mask = env->kvm_run->psw_mask;

	return 0;
	}

	int kvm_arch_insert_sw_breakpoint(CPUState env, struct kvm_sw_breakpoint bp)
	{
	static const uint8_t diag_501[] = {0x83, 0x24, 0x05, 0x01};

	if (cpu_memory_rw_debug(env, bp->pc, (uint8_t *)&bp->saved_insn, 4, 0) \|\|
	cpu_memory_rw_debug(env, bp->pc, (uint8_t *)diag_501, 4, 1)) {
	return -EINVAL;
	}
	return 0;
	}

	int kvm_arch_remove_sw_breakpoint(CPUState env, struct kvm_sw_breakpoint bp)
	{
	uint8_t t[4];
	static const uint8_t diag_501[] = {0x83, 0x24, 0x05, 0x01};

	if (cpu_memory_rw_debug(env, bp->pc, t, 4, 0)) {
	return -EINVAL;
	} else if (memcmp(t, diag_501, 4)) {
	return -EINVAL;
	} else if (cpu_memory_rw_debug(env, bp->pc, (uint8_t *)&bp->saved_insn, 1, 1)) {
	return -EINVAL;
	}

	return 0;
	}

	void kvm_arch_pre_run(CPUState env, struct kvm_run run)
	{
	}

	void kvm_arch_post_run(CPUState env, struct kvm_run run)
	{
	}

	int kvm_arch_process_async_events(CPUState *env)
	{
	return env->halted;
	}

	void kvm_s390_interrupt_internal(CPUState *env, int type, uint32_t parm,
	uint64_t parm64, int vm)
	{
	struct kvm_s390_interrupt kvmint;
	int r;

	if (!env->kvm_state) {
	return;
	}

	env->halted = 0;
	env->exception_index = -1;
	qemu_cpu_kick(env);

	kvmint.type = type;
	kvmint.parm = parm;
	kvmint.parm64 = parm64;

	if (vm) {
	r = kvm_vm_ioctl(env->kvm_state, KVM_S390_INTERRUPT, &kvmint);
	} else {
	r = kvm_vcpu_ioctl(env, KVM_S390_INTERRUPT, &kvmint);
	}

	if (r < 0) {
	fprintf(stderr, "KVM failed to inject interrupt\n");
	exit(1);
	}
	}

	void kvm_s390_virtio_irq(CPUState *env, int config_change, uint64_t token)
	{
	kvm_s390_interrupt_internal(env, KVM_S390_INT_VIRTIO, config_change,
	token, 1);
	}

	void kvm_s390_interrupt(CPUState *env, int type, uint32_t code)
	{
	kvm_s390_interrupt_internal(env, type, code, 0, 0);
	}

	static void enter_pgmcheck(CPUState *env, uint16_t code)
	{
	kvm_s390_interrupt(env, KVM_S390_PROGRAM_INT, code);
	}

	static inline void setcc(CPUState *env, uint64_t cc)
	{
	env->kvm_run->psw_mask &= ~(3ull << 44);
	env->kvm_run->psw_mask \|= (cc & 3) << 44;

	env->psw.mask &= ~(3ul << 44);
	env->psw.mask \|= (cc & 3) << 44;
	}

	static int kvm_sclp_service_call(CPUState env, struct kvm_run run,
	uint16_t ipbh0)
	{
	uint32_t sccb;
	uint64_t code;
	int r = 0;

	cpu_synchronize_state(env);
	sccb = env->regs[ipbh0 & 0xf];
	code = env->regs[(ipbh0 & 0xf0) >> 4];

	r = sclp_service_call(env, sccb, code);
	if (r) {
	setcc(env, 3);
	}

	return 0;
	}

	static int handle_priv(CPUState env, struct kvm_run run, uint8_t ipa1)
	{
	int r = 0;
	uint16_t ipbh0 = (run->s390_sieic.ipb & 0xffff0000) >> 16;

	dprintf("KVM: PRIV: %d\n", ipa1);
	switch (ipa1) {
	case PRIV_SCLP_CALL:
	r = kvm_sclp_service_call(env, run, ipbh0);
	break;
	default:
	dprintf("KVM: unknown PRIV: 0x%x\n", ipa1);
	r = -1;
	break;
	}

	return r;
	}

	static int handle_hypercall(CPUState env, struct kvm_run run)
	{
	cpu_synchronize_state(env);
	env->regs[2] = s390_virtio_hypercall(env, env->regs[2], env->regs[1]);

	return 0;
	}

	static int handle_diag(CPUState env, struct kvm_run run, int ipb_code)
	{
	int r = 0;

	switch (ipb_code) {
	case DIAG_KVM_HYPERCALL:
	r = handle_hypercall(env, run);
	break;
	case DIAG_KVM_BREAKPOINT:
	sleep(10);
	break;
	default:
	dprintf("KVM: unknown DIAG: 0x%x\n", ipb_code);
	r = -1;
	break;
	}

	return r;
	}

	static int s390_cpu_restart(CPUState *env)
	{
	kvm_s390_interrupt(env, KVM_S390_RESTART, 0);
	env->halted = 0;
	env->exception_index = -1;
	qemu_cpu_kick(env);
	dprintf("DONE: SIGP cpu restart: %p\n", env);
	return 0;
	}

	static int s390_store_status(CPUState *env, uint32_t parameter)
	{
	/* XXX */
	fprintf(stderr, "XXX SIGP store status\n");
	return -1;
	}

	static int s390_cpu_initial_reset(CPUState *env)
	{
	int i;

	if (kvm_vcpu_ioctl(env, KVM_S390_INITIAL_RESET, NULL) < 0) {
	perror("cannot init reset vcpu");
	}

	/* Manually zero out all registers */
	cpu_synchronize_state(env);
	for (i = 0; i < 16; i++) {
	env->regs[i] = 0;
	}

	dprintf("DONE: SIGP initial reset: %p\n", env);
	return 0;
	}

	static int handle_sigp(CPUState env, struct kvm_run run, uint8_t ipa1)
	{
	uint8_t order_code;
	uint32_t parameter;
	uint16_t cpu_addr;
	uint8_t t;
	int r = -1;
	CPUState *target_env;

	cpu_synchronize_state(env);

	/* get order code */
	order_code = run->s390_sieic.ipb >> 28;
	if (order_code > 0) {
	order_code = env->regs[order_code];
	}
	order_code += (run->s390_sieic.ipb & 0x0fff0000) >> 16;

	/* get parameters */
	t = (ipa1 & 0xf0) >> 4;
	if (!(t % 2)) {
	t++;
	}

	parameter = env->regs[t] & 0x7ffffe00;
	cpu_addr = env->regs[ipa1 & 0x0f];

	target_env = s390_cpu_addr2state(cpu_addr);
	if (!target_env) {
	goto out;
	}

	switch (order_code) {
	case SIGP_RESTART:
	r = s390_cpu_restart(target_env);
	break;
	case SIGP_STORE_STATUS_ADDR:
	r = s390_store_status(target_env, parameter);
	break;
	case SIGP_SET_ARCH:
	/* make the caller panic */
	return -1;
	case SIGP_INITIAL_CPU_RESET:
	r = s390_cpu_initial_reset(target_env);
	break;
	default:
	fprintf(stderr, "KVM: unknown SIGP: 0x%x\n", order_code);
	break;
	}

	out:
	setcc(env, r ? 3 : 0);
	return 0;
	}

	static int handle_instruction(CPUState env, struct kvm_run run)
	{
	unsigned int ipa0 = (run->s390_sieic.ipa & 0xff00);
	uint8_t ipa1 = run->s390_sieic.ipa & 0x00ff;
	int ipb_code = (run->s390_sieic.ipb & 0x0fff0000) >> 16;
	int r = -1;

	dprintf("handle_instruction 0x%x 0x%x\n", run->s390_sieic.ipa, run->s390_sieic.ipb);
	switch (ipa0) {
	case IPA0_PRIV:
	r = handle_priv(env, run, ipa1);
	break;
	case IPA0_DIAG:
	r = handle_diag(env, run, ipb_code);
	break;
	case IPA0_SIGP:
	r = handle_sigp(env, run, ipa1);
	break;
	}

	if (r < 0) {
	enter_pgmcheck(env, 0x0001);
	}
	return 0;
	}

	static int handle_intercept(CPUState *env)
	{
	struct kvm_run *run = env->kvm_run;
	int icpt_code = run->s390_sieic.icptcode;
	int r = 0;

	dprintf("intercept: 0x%x (at 0x%lx)\n", icpt_code,
	(long)env->kvm_run->psw_addr);
	switch (icpt_code) {
	case ICPT_INSTRUCTION:
	r = handle_instruction(env, run);
	break;
	case ICPT_WAITPSW:
	/* XXX What to do on system shutdown? */
	env->halted = 1;
	env->exception_index = EXCP_HLT;
	break;
	case ICPT_SOFT_INTERCEPT:
	fprintf(stderr, "KVM unimplemented icpt SOFT\n");
	exit(1);
	break;
	case ICPT_CPU_STOP:
	qemu_system_shutdown_request();
	break;
	case ICPT_IO:
	fprintf(stderr, "KVM unimplemented icpt IO\n");
	exit(1);
	break;
	default:
	fprintf(stderr, "Unknown intercept code: %d\n", icpt_code);
	exit(1);
	break;
	}

	return r;
	}

	int kvm_arch_handle_exit(CPUState env, struct kvm_run run)
	{
	int ret = 0;

	switch (run->exit_reason) {
	case KVM_EXIT_S390_SIEIC:
	ret = handle_intercept(env);
	break;
	case KVM_EXIT_S390_RESET:
	fprintf(stderr, "RESET not implemented\n");
	exit(1);
	break;
	default:
	fprintf(stderr, "Unknown KVM exit: %d\n", run->exit_reason);
	break;
	}

	if (ret == 0) {
	ret = EXCP_INTERRUPT;
	} else if (ret > 0) {
	ret = 0;
	}
	return ret;
	}

	bool kvm_arch_stop_on_emulation_error(CPUState *env)
	{
	return true;
	}

	int kvm_arch_on_sigbus_vcpu(CPUState env, int code, void addr)
	{
	return 1;
	}

	int kvm_arch_on_sigbus(int code, void *addr)
	{
	return 1;
	}