target/s390x/cpu-sysemu.c - qemu - Git at Google

 /*
  * QEMU S/390 CPU - System Emulation-only code
  *
  * Copyright (c) 2009 Ulrich Hecht
  * Copyright (c) 2011 Alexander Graf
  * Copyright (c) 2012 SUSE LINUX Products GmbH
  * Copyright (c) 2012 IBM Corp.
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
  * the Free Software Foundation; either version 2 of the License, or
  * (at your option) any later version.
  *
  * This program 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
  * General Public License for more details.
  *
  * You should have received a copy of the GNU General Public License
  * along with this program; if not, see <http://www.gnu.org/licenses/>.
  */

 #include "qemu/osdep.h"
 #include "qapi/error.h"
 #include "cpu.h"
 #include "s390x-internal.h"
 #include "kvm/kvm_s390x.h"
 #include "sysemu/kvm.h"
 #include "sysemu/reset.h"
 #include "qemu/timer.h"
 #include "trace.h"
 #include "qapi/qapi-visit-run-state.h"
 #include "sysemu/hw_accel.h"

 #include "hw/s390x/pv.h"
 #include "hw/boards.h"
 #include "sysemu/sysemu.h"
 #include "sysemu/tcg.h"
 #include "hw/core/sysemu-cpu-ops.h"

 /* S390CPUClass::load_normal() */
 static void s390_cpu_load_normal(CPUState *s)
 {
     S390CPU *cpu = S390_CPU(s);
     uint64_t spsw;

     if (!s390_is_pv()) {
         spsw = ldq_phys(s->as, 0);
         cpu->env.psw.mask = spsw & PSW_MASK_SHORT_CTRL;
         /*
          * Invert short psw indication, so SIE will report a specification
          * exception if it was not set.
          */
         cpu->env.psw.mask ^= PSW_MASK_SHORTPSW;
         cpu->env.psw.addr = spsw & PSW_MASK_SHORT_ADDR;
     } else {
         /*
          * Firmware requires us to set the load state before we set
          * the cpu to operating on protected guests.
          */
         s390_cpu_set_state(S390_CPU_STATE_LOAD, cpu);
     }
     s390_cpu_set_state(S390_CPU_STATE_OPERATING, cpu);
 }

 void s390_cpu_machine_reset_cb(void *opaque)
 {
     S390CPU *cpu = opaque;

     run_on_cpu(CPU(cpu), s390_do_cpu_full_reset, RUN_ON_CPU_NULL);
 }

 static GuestPanicInformation *s390_cpu_get_crash_info(CPUState *cs)
 {
     GuestPanicInformation *panic_info;
     S390CPU *cpu = S390_CPU(cs);

     cpu_synchronize_state(cs);
     panic_info = g_new0(GuestPanicInformation, 1);

     panic_info->type = GUEST_PANIC_INFORMATION_TYPE_S390;
     panic_info->u.s390.core = cpu->env.core_id;
     panic_info->u.s390.psw_mask = cpu->env.psw.mask;
     panic_info->u.s390.psw_addr = cpu->env.psw.addr;
     panic_info->u.s390.reason = cpu->env.crash_reason;

     return panic_info;
 }

 static void s390_cpu_get_crash_info_qom(Object *obj, Visitor *v,
                                         const char *name, void *opaque,
                                         Error **errp)
 {
     CPUState *cs = CPU(obj);
     GuestPanicInformation *panic_info;

     if (!cs->crash_occurred) {
         error_setg(errp, "No crash occurred");
         return;
     }

     panic_info = s390_cpu_get_crash_info(cs);

     visit_type_GuestPanicInformation(v, "crash-information", &panic_info,
                                      errp);
     qapi_free_GuestPanicInformation(panic_info);
 }

 void s390_cpu_init_sysemu(Object *obj)
 {
     CPUState *cs = CPU(obj);
     S390CPU *cpu = S390_CPU(obj);

     cs->start_powered_off = true;
     object_property_add(obj, "crash-information", "GuestPanicInformation",
                         s390_cpu_get_crash_info_qom, NULL, NULL, NULL);
     cpu->env.tod_timer =
         timer_new_ns(QEMU_CLOCK_VIRTUAL, s390x_tod_timer, cpu);
     cpu->env.cpu_timer =
         timer_new_ns(QEMU_CLOCK_VIRTUAL, s390x_cpu_timer, cpu);
     s390_cpu_set_state(S390_CPU_STATE_STOPPED, cpu);
 }

 bool s390_cpu_realize_sysemu(DeviceState *dev, Error **errp)
 {
     S390CPU *cpu = S390_CPU(dev);
     MachineState *ms = MACHINE(qdev_get_machine());
     unsigned int max_cpus = ms->smp.max_cpus;

     if (cpu->env.core_id >= max_cpus) {
         error_setg(errp, "Unable to add CPU with core-id: %" PRIu32
                    ", maximum core-id: %d", cpu->env.core_id,
                    max_cpus - 1);
         return false;
     }

     if (cpu_exists(cpu->env.core_id)) {
         error_setg(errp, "Unable to add CPU with core-id: %" PRIu32
                    ", it already exists", cpu->env.core_id);
         return false;
     }

     /* sync cs->cpu_index and env->core_id. The latter is needed for TCG. */
     CPU(cpu)->cpu_index = cpu->env.core_id;
     return true;
 }

 void s390_cpu_finalize(Object *obj)
 {
     S390CPU *cpu = S390_CPU(obj);

     timer_free(cpu->env.tod_timer);
     timer_free(cpu->env.cpu_timer);

     qemu_unregister_reset(s390_cpu_machine_reset_cb, cpu);
     g_free(cpu->irqstate);
 }

 static const struct SysemuCPUOps s390_sysemu_ops = {
     .get_phys_page_debug = s390_cpu_get_phys_page_debug,
     .get_crash_info = s390_cpu_get_crash_info,
     .write_elf64_note = s390_cpu_write_elf64_note,
     .legacy_vmsd = &vmstate_s390_cpu,
 };

 void s390_cpu_class_init_sysemu(CPUClass *cc)
 {
     S390CPUClass *scc = S390_CPU_CLASS(cc);

     scc->load_normal = s390_cpu_load_normal;
     cc->sysemu_ops = &s390_sysemu_ops;
 }

 static bool disabled_wait(CPUState *cpu)
 {
     return cpu->halted && !(S390_CPU(cpu)->env.psw.mask &
                             (PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK));
 }

 static unsigned s390_count_running_cpus(void)
 {
     CPUState *cpu;
     int nr_running = 0;

     CPU_FOREACH(cpu) {
         uint8_t state = S390_CPU(cpu)->env.cpu_state;
         if (state == S390_CPU_STATE_OPERATING ||
             state == S390_CPU_STATE_LOAD) {
             if (!disabled_wait(cpu)) {
                 nr_running++;
             }
         }
     }

     return nr_running;
 }

 unsigned int s390_cpu_halt(S390CPU *cpu)
 {
     CPUState *cs = CPU(cpu);
     trace_cpu_halt(cs->cpu_index);

     if (!cs->halted) {
         cs->halted = 1;
         cs->exception_index = EXCP_HLT;
     }

     return s390_count_running_cpus();
 }

 void s390_cpu_unhalt(S390CPU *cpu)
 {
     CPUState *cs = CPU(cpu);
     trace_cpu_unhalt(cs->cpu_index);

     if (cs->halted) {
         cs->halted = 0;
         cs->exception_index = -1;
     }
 }

 unsigned int s390_cpu_set_state(uint8_t cpu_state, S390CPU *cpu)
  {
     trace_cpu_set_state(CPU(cpu)->cpu_index, cpu_state);

     switch (cpu_state) {
     case S390_CPU_STATE_STOPPED:
     case S390_CPU_STATE_CHECK_STOP:
         /* halt the cpu for common infrastructure */
         s390_cpu_halt(cpu);
         break;
     case S390_CPU_STATE_OPERATING:
     case S390_CPU_STATE_LOAD:
         /*
          * Starting a CPU with a PSW WAIT bit set:
          * KVM: handles this internally and triggers another WAIT exit.
          * TCG: will actually try to continue to run. Don't unhalt, will
          *      be done when the CPU actually has work (an interrupt).
          */
         if (!tcg_enabled() || !(cpu->env.psw.mask & PSW_MASK_WAIT)) {
             s390_cpu_unhalt(cpu);
         }
         break;
     default:
         error_report("Requested CPU state is not a valid S390 CPU state: %u",
                      cpu_state);
         exit(1);
     }
     if (kvm_enabled() && cpu->env.cpu_state != cpu_state) {
         kvm_s390_set_cpu_state(cpu, cpu_state);
     }
     cpu->env.cpu_state = cpu_state;

     return s390_count_running_cpus();
 }

 int s390_set_memory_limit(uint64_t new_limit, uint64_t *hw_limit)
 {
     if (kvm_enabled()) {
         return kvm_s390_set_mem_limit(new_limit, hw_limit);
     }
     return 0;
 }

 void s390_set_max_pagesize(uint64_t pagesize, Error **errp)
 {
     if (kvm_enabled()) {
         kvm_s390_set_max_pagesize(pagesize, errp);
     }
 }

 void s390_cmma_reset(void)
 {
     if (kvm_enabled()) {
         kvm_s390_cmma_reset();
     }
 }

 int s390_assign_subch_ioeventfd(EventNotifier *notifier, uint32_t sch_id,
                                 int vq, bool assign)
 {
     if (kvm_enabled()) {
         return kvm_s390_assign_subch_ioeventfd(notifier, sch_id, vq, assign);
     } else {
         return 0;
     }
 }

 void s390_crypto_reset(void)
 {
     if (kvm_enabled()) {
         kvm_s390_crypto_reset();
     }
 }

 void s390_enable_css_support(S390CPU *cpu)
 {
     if (kvm_enabled()) {
         kvm_s390_enable_css_support(cpu);
     }
 }

 void s390_do_cpu_set_diag318(CPUState *cs, run_on_cpu_data arg)
 {
     if (kvm_enabled()) {
         kvm_s390_set_diag318(cs, arg.host_ulong);
     }
 }
	/*
	* QEMU S/390 CPU - System Emulation-only code
	*
	* Copyright (c) 2009 Ulrich Hecht
	* Copyright (c) 2011 Alexander Graf
	* Copyright (c) 2012 SUSE LINUX Products GmbH
	* Copyright (c) 2012 IBM Corp.
	*
	* This program is free software; you can redistribute it and/or modify
	* it under the terms of the GNU General Public License as published by
	* the Free Software Foundation; either version 2 of the License, or
	* (at your option) any later version.
	*
	* This program 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
	* General Public License for more details.
	*
	* You should have received a copy of the GNU General Public License
	* along with this program; if not, see <http://www.gnu.org/licenses/>.
	*/

	#include "qemu/osdep.h"
	#include "qapi/error.h"
	#include "cpu.h"
	#include "s390x-internal.h"
	#include "kvm/kvm_s390x.h"
	#include "sysemu/kvm.h"
	#include "sysemu/reset.h"
	#include "qemu/timer.h"
	#include "trace.h"
	#include "qapi/qapi-visit-run-state.h"
	#include "sysemu/hw_accel.h"

	#include "hw/s390x/pv.h"
	#include "hw/boards.h"
	#include "sysemu/sysemu.h"
	#include "sysemu/tcg.h"
	#include "hw/core/sysemu-cpu-ops.h"

	/* S390CPUClass::load_normal() */
	static void s390_cpu_load_normal(CPUState *s)
	{
	S390CPU *cpu = S390_CPU(s);
	uint64_t spsw;

	if (!s390_is_pv()) {
	spsw = ldq_phys(s->as, 0);
	cpu->env.psw.mask = spsw & PSW_MASK_SHORT_CTRL;
	/*
	* Invert short psw indication, so SIE will report a specification
	* exception if it was not set.
	*/
	cpu->env.psw.mask ^= PSW_MASK_SHORTPSW;
	cpu->env.psw.addr = spsw & PSW_MASK_SHORT_ADDR;
	} else {
	/*
	* Firmware requires us to set the load state before we set
	* the cpu to operating on protected guests.
	*/
	s390_cpu_set_state(S390_CPU_STATE_LOAD, cpu);
	}
	s390_cpu_set_state(S390_CPU_STATE_OPERATING, cpu);
	}

	void s390_cpu_machine_reset_cb(void *opaque)
	{
	S390CPU *cpu = opaque;

	run_on_cpu(CPU(cpu), s390_do_cpu_full_reset, RUN_ON_CPU_NULL);
	}

	static GuestPanicInformation s390_cpu_get_crash_info(CPUState cs)
	{
	GuestPanicInformation *panic_info;
	S390CPU *cpu = S390_CPU(cs);

	cpu_synchronize_state(cs);
	panic_info = g_new0(GuestPanicInformation, 1);

	panic_info->type = GUEST_PANIC_INFORMATION_TYPE_S390;
	panic_info->u.s390.core = cpu->env.core_id;
	panic_info->u.s390.psw_mask = cpu->env.psw.mask;
	panic_info->u.s390.psw_addr = cpu->env.psw.addr;
	panic_info->u.s390.reason = cpu->env.crash_reason;

	return panic_info;
	}

	static void s390_cpu_get_crash_info_qom(Object obj, Visitor v,
	const char name, void opaque,
	Error **errp)
	{
	CPUState *cs = CPU(obj);
	GuestPanicInformation *panic_info;

	if (!cs->crash_occurred) {
	error_setg(errp, "No crash occurred");
	return;
	}

	panic_info = s390_cpu_get_crash_info(cs);

	visit_type_GuestPanicInformation(v, "crash-information", &panic_info,
	errp);
	qapi_free_GuestPanicInformation(panic_info);
	}

	void s390_cpu_init_sysemu(Object *obj)
	{
	CPUState *cs = CPU(obj);
	S390CPU *cpu = S390_CPU(obj);

	cs->start_powered_off = true;
	object_property_add(obj, "crash-information", "GuestPanicInformation",
	s390_cpu_get_crash_info_qom, NULL, NULL, NULL);
	cpu->env.tod_timer =
	timer_new_ns(QEMU_CLOCK_VIRTUAL, s390x_tod_timer, cpu);
	cpu->env.cpu_timer =
	timer_new_ns(QEMU_CLOCK_VIRTUAL, s390x_cpu_timer, cpu);
	s390_cpu_set_state(S390_CPU_STATE_STOPPED, cpu);
	}

	bool s390_cpu_realize_sysemu(DeviceState dev, Error *errp)
	{
	S390CPU *cpu = S390_CPU(dev);
	MachineState *ms = MACHINE(qdev_get_machine());
	unsigned int max_cpus = ms->smp.max_cpus;

	if (cpu->env.core_id >= max_cpus) {
	error_setg(errp, "Unable to add CPU with core-id: %" PRIu32
	", maximum core-id: %d", cpu->env.core_id,
	max_cpus - 1);
	return false;
	}

	if (cpu_exists(cpu->env.core_id)) {
	error_setg(errp, "Unable to add CPU with core-id: %" PRIu32
	", it already exists", cpu->env.core_id);
	return false;
	}

	/* sync cs->cpu_index and env->core_id. The latter is needed for TCG. */
	CPU(cpu)->cpu_index = cpu->env.core_id;
	return true;
	}

	void s390_cpu_finalize(Object *obj)
	{
	S390CPU *cpu = S390_CPU(obj);

	timer_free(cpu->env.tod_timer);
	timer_free(cpu->env.cpu_timer);

	qemu_unregister_reset(s390_cpu_machine_reset_cb, cpu);
	g_free(cpu->irqstate);
	}

	static const struct SysemuCPUOps s390_sysemu_ops = {
	.get_phys_page_debug = s390_cpu_get_phys_page_debug,
	.get_crash_info = s390_cpu_get_crash_info,
	.write_elf64_note = s390_cpu_write_elf64_note,
	.legacy_vmsd = &vmstate_s390_cpu,
	};

	void s390_cpu_class_init_sysemu(CPUClass *cc)
	{
	S390CPUClass *scc = S390_CPU_CLASS(cc);

	scc->load_normal = s390_cpu_load_normal;
	cc->sysemu_ops = &s390_sysemu_ops;
	}

	static bool disabled_wait(CPUState *cpu)
	{
	return cpu->halted && !(S390_CPU(cpu)->env.psw.mask &
	(PSW_MASK_IO \| PSW_MASK_EXT \| PSW_MASK_MCHECK));
	}

	static unsigned s390_count_running_cpus(void)
	{
	CPUState *cpu;
	int nr_running = 0;

	CPU_FOREACH(cpu) {
	uint8_t state = S390_CPU(cpu)->env.cpu_state;
	if (state == S390_CPU_STATE_OPERATING \|\|
	state == S390_CPU_STATE_LOAD) {
	if (!disabled_wait(cpu)) {
	nr_running++;
	}
	}
	}

	return nr_running;
	}

	unsigned int s390_cpu_halt(S390CPU *cpu)
	{
	CPUState *cs = CPU(cpu);
	trace_cpu_halt(cs->cpu_index);

	if (!cs->halted) {
	cs->halted = 1;
	cs->exception_index = EXCP_HLT;
	}

	return s390_count_running_cpus();
	}

	void s390_cpu_unhalt(S390CPU *cpu)
	{
	CPUState *cs = CPU(cpu);
	trace_cpu_unhalt(cs->cpu_index);

	if (cs->halted) {
	cs->halted = 0;
	cs->exception_index = -1;
	}
	}

	unsigned int s390_cpu_set_state(uint8_t cpu_state, S390CPU *cpu)
	{
	trace_cpu_set_state(CPU(cpu)->cpu_index, cpu_state);

	switch (cpu_state) {
	case S390_CPU_STATE_STOPPED:
	case S390_CPU_STATE_CHECK_STOP:
	/* halt the cpu for common infrastructure */
	s390_cpu_halt(cpu);
	break;
	case S390_CPU_STATE_OPERATING:
	case S390_CPU_STATE_LOAD:
	/*
	* Starting a CPU with a PSW WAIT bit set:
	* KVM: handles this internally and triggers another WAIT exit.
	* TCG: will actually try to continue to run. Don't unhalt, will
	* be done when the CPU actually has work (an interrupt).
	*/
	if (!tcg_enabled() \|\| !(cpu->env.psw.mask & PSW_MASK_WAIT)) {
	s390_cpu_unhalt(cpu);
	}
	break;
	default:
	error_report("Requested CPU state is not a valid S390 CPU state: %u",
	cpu_state);
	exit(1);
	}
	if (kvm_enabled() && cpu->env.cpu_state != cpu_state) {
	kvm_s390_set_cpu_state(cpu, cpu_state);
	}
	cpu->env.cpu_state = cpu_state;

	return s390_count_running_cpus();
	}

	int s390_set_memory_limit(uint64_t new_limit, uint64_t *hw_limit)
	{
	if (kvm_enabled()) {
	return kvm_s390_set_mem_limit(new_limit, hw_limit);
	}
	return 0;
	}

	void s390_set_max_pagesize(uint64_t pagesize, Error **errp)
	{
	if (kvm_enabled()) {
	kvm_s390_set_max_pagesize(pagesize, errp);
	}
	}

	void s390_cmma_reset(void)
	{
	if (kvm_enabled()) {
	kvm_s390_cmma_reset();
	}
	}

	int s390_assign_subch_ioeventfd(EventNotifier *notifier, uint32_t sch_id,
	int vq, bool assign)
	{
	if (kvm_enabled()) {
	return kvm_s390_assign_subch_ioeventfd(notifier, sch_id, vq, assign);
	} else {
	return 0;
	}
	}

	void s390_crypto_reset(void)
	{
	if (kvm_enabled()) {
	kvm_s390_crypto_reset();
	}
	}

	void s390_enable_css_support(S390CPU *cpu)
	{
	if (kvm_enabled()) {
	kvm_s390_enable_css_support(cpu);
	}
	}

	void s390_do_cpu_set_diag318(CPUState *cs, run_on_cpu_data arg)
	{
	if (kvm_enabled()) {
	kvm_s390_set_diag318(cs, arg.host_ulong);
	}
	}