378df4b237
Fix some of the nasty TCG race conditions and crashes by implementing cpu_exit() as setting a flag which is checked at the start of each TB. This avoids crashes if a thread or signal handler calls cpu_exit() while the execution thread is itself modifying the TB graph (which may happen in system emulation mode as well as in linux-user mode with a multithreaded guest binary). This fixes the crashes seen in LP:668799; however there are another class of crashes described in LP:1098729 which stem from the fact that in linux-user with a multithreaded guest all threads will use and modify the same global TCG date structures (including the generated code buffer) without any kind of locking. This means that multithreaded guest binaries are still in the "unsupported" category. Signed-off-by: Peter Maydell <peter.maydell@linaro.org> Reviewed-by: Richard Henderson <rth@twiddle.net> Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
198 lines
4.9 KiB
C
198 lines
4.9 KiB
C
/*
|
|
* QEMU CPU model
|
|
*
|
|
* Copyright (c) 2012 SUSE LINUX Products GmbH
|
|
*
|
|
* 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/gpl-2.0.html>
|
|
*/
|
|
#ifndef QEMU_CPU_H
|
|
#define QEMU_CPU_H
|
|
|
|
#include <signal.h>
|
|
#include "hw/qdev-core.h"
|
|
#include "qemu/thread.h"
|
|
|
|
/**
|
|
* SECTION:cpu
|
|
* @section_id: QEMU-cpu
|
|
* @title: CPU Class
|
|
* @short_description: Base class for all CPUs
|
|
*/
|
|
|
|
#define TYPE_CPU "cpu"
|
|
|
|
#define CPU(obj) OBJECT_CHECK(CPUState, (obj), TYPE_CPU)
|
|
#define CPU_CLASS(class) OBJECT_CLASS_CHECK(CPUClass, (class), TYPE_CPU)
|
|
#define CPU_GET_CLASS(obj) OBJECT_GET_CLASS(CPUClass, (obj), TYPE_CPU)
|
|
|
|
typedef struct CPUState CPUState;
|
|
|
|
/**
|
|
* CPUClass:
|
|
* @class_by_name: Callback to map -cpu command line model name to an
|
|
* instantiatable CPU type.
|
|
* @reset: Callback to reset the #CPUState to its initial state.
|
|
*
|
|
* Represents a CPU family or model.
|
|
*/
|
|
typedef struct CPUClass {
|
|
/*< private >*/
|
|
DeviceClass parent_class;
|
|
/*< public >*/
|
|
|
|
ObjectClass *(*class_by_name)(const char *cpu_model);
|
|
|
|
void (*reset)(CPUState *cpu);
|
|
} CPUClass;
|
|
|
|
struct KVMState;
|
|
struct kvm_run;
|
|
|
|
/**
|
|
* CPUState:
|
|
* @cpu_index: CPU index (informative).
|
|
* @nr_cores: Number of cores within this CPU package.
|
|
* @nr_threads: Number of threads within this CPU.
|
|
* @numa_node: NUMA node this CPU is belonging to.
|
|
* @host_tid: Host thread ID.
|
|
* @running: #true if CPU is currently running (usermode).
|
|
* @created: Indicates whether the CPU thread has been successfully created.
|
|
* @stop: Indicates a pending stop request.
|
|
* @stopped: Indicates the CPU has been artificially stopped.
|
|
* @tcg_exit_req: Set to force TCG to stop executing linked TBs for this
|
|
* CPU and return to its top level loop.
|
|
* @env_ptr: Pointer to subclass-specific CPUArchState field.
|
|
* @current_tb: Currently executing TB.
|
|
* @kvm_fd: vCPU file descriptor for KVM.
|
|
*
|
|
* State of one CPU core or thread.
|
|
*/
|
|
struct CPUState {
|
|
/*< private >*/
|
|
DeviceState parent_obj;
|
|
/*< public >*/
|
|
|
|
int nr_cores;
|
|
int nr_threads;
|
|
int numa_node;
|
|
|
|
struct QemuThread *thread;
|
|
#ifdef _WIN32
|
|
HANDLE hThread;
|
|
#endif
|
|
int thread_id;
|
|
uint32_t host_tid;
|
|
bool running;
|
|
struct QemuCond *halt_cond;
|
|
struct qemu_work_item *queued_work_first, *queued_work_last;
|
|
bool thread_kicked;
|
|
bool created;
|
|
bool stop;
|
|
bool stopped;
|
|
volatile sig_atomic_t exit_request;
|
|
volatile sig_atomic_t tcg_exit_req;
|
|
|
|
void *env_ptr; /* CPUArchState */
|
|
struct TranslationBlock *current_tb;
|
|
|
|
int kvm_fd;
|
|
bool kvm_vcpu_dirty;
|
|
struct KVMState *kvm_state;
|
|
struct kvm_run *kvm_run;
|
|
|
|
/* TODO Move common fields from CPUArchState here. */
|
|
int cpu_index; /* used by alpha TCG */
|
|
};
|
|
|
|
|
|
/**
|
|
* cpu_reset:
|
|
* @cpu: The CPU whose state is to be reset.
|
|
*/
|
|
void cpu_reset(CPUState *cpu);
|
|
|
|
/**
|
|
* cpu_class_by_name:
|
|
* @typename: The CPU base type.
|
|
* @cpu_model: The model string without any parameters.
|
|
*
|
|
* Looks up a CPU #ObjectClass matching name @cpu_model.
|
|
*
|
|
* Returns: A #CPUClass or %NULL if not matching class is found.
|
|
*/
|
|
ObjectClass *cpu_class_by_name(const char *typename, const char *cpu_model);
|
|
|
|
/**
|
|
* qemu_cpu_has_work:
|
|
* @cpu: The vCPU to check.
|
|
*
|
|
* Checks whether the CPU has work to do.
|
|
*
|
|
* Returns: %true if the CPU has work, %false otherwise.
|
|
*/
|
|
bool qemu_cpu_has_work(CPUState *cpu);
|
|
|
|
/**
|
|
* qemu_cpu_is_self:
|
|
* @cpu: The vCPU to check against.
|
|
*
|
|
* Checks whether the caller is executing on the vCPU thread.
|
|
*
|
|
* Returns: %true if called from @cpu's thread, %false otherwise.
|
|
*/
|
|
bool qemu_cpu_is_self(CPUState *cpu);
|
|
|
|
/**
|
|
* qemu_cpu_kick:
|
|
* @cpu: The vCPU to kick.
|
|
*
|
|
* Kicks @cpu's thread.
|
|
*/
|
|
void qemu_cpu_kick(CPUState *cpu);
|
|
|
|
/**
|
|
* cpu_is_stopped:
|
|
* @cpu: The CPU to check.
|
|
*
|
|
* Checks whether the CPU is stopped.
|
|
*
|
|
* Returns: %true if run state is not running or if artificially stopped;
|
|
* %false otherwise.
|
|
*/
|
|
bool cpu_is_stopped(CPUState *cpu);
|
|
|
|
/**
|
|
* run_on_cpu:
|
|
* @cpu: The vCPU to run on.
|
|
* @func: The function to be executed.
|
|
* @data: Data to pass to the function.
|
|
*
|
|
* Schedules the function @func for execution on the vCPU @cpu.
|
|
*/
|
|
void run_on_cpu(CPUState *cpu, void (*func)(void *data), void *data);
|
|
|
|
/**
|
|
* qemu_get_cpu:
|
|
* @index: The CPUState@cpu_index value of the CPU to obtain.
|
|
*
|
|
* Gets a CPU matching @index.
|
|
*
|
|
* Returns: The CPU or %NULL if there is no matching CPU.
|
|
*/
|
|
CPUState *qemu_get_cpu(int index);
|
|
|
|
|
|
#endif
|