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X-Received-From: 2607:f8b0:4864:20::742 X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: richard.henderson@linaro.org, "Emilio G. Cota" , alex.bennee@linaro.org, robert.foley@linaro.org, peter.puhov@linaro.org Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" From: "Emilio G. Cota" This lock will soon protect more fields of the struct. Give it a more appropriate name. Reviewed-by: Richard Henderson Reviewed-by: Alex Bennée Signed-off-by: Emilio G. Cota Signed-off-by: Robert Foley --- cpus-common.c | 14 +++++++------- cpus.c | 4 ++-- hw/core/cpu.c | 4 ++-- include/hw/core/cpu.h | 6 ++++-- 4 files changed, 15 insertions(+), 13 deletions(-) diff --git a/cpus-common.c b/cpus-common.c index 3d659df464..f75cae23d9 100644 --- a/cpus-common.c +++ b/cpus-common.c @@ -107,10 +107,10 @@ struct qemu_work_item { static void queue_work_on_cpu(CPUState *cpu, struct qemu_work_item *wi) { - qemu_mutex_lock(&cpu->work_mutex); + qemu_mutex_lock(&cpu->lock); QSIMPLEQ_INSERT_TAIL(&cpu->work_list, wi, node); wi->done = false; - qemu_mutex_unlock(&cpu->work_mutex); + qemu_mutex_unlock(&cpu->lock); qemu_cpu_kick(cpu); } @@ -304,15 +304,15 @@ void process_queued_cpu_work(CPUState *cpu) { struct qemu_work_item *wi; - qemu_mutex_lock(&cpu->work_mutex); + qemu_mutex_lock(&cpu->lock); if (QSIMPLEQ_EMPTY(&cpu->work_list)) { - qemu_mutex_unlock(&cpu->work_mutex); + qemu_mutex_unlock(&cpu->lock); return; } while (!QSIMPLEQ_EMPTY(&cpu->work_list)) { wi = QSIMPLEQ_FIRST(&cpu->work_list); QSIMPLEQ_REMOVE_HEAD(&cpu->work_list, node); - qemu_mutex_unlock(&cpu->work_mutex); + qemu_mutex_unlock(&cpu->lock); if (wi->exclusive) { /* Running work items outside the BQL avoids the following deadlock: * 1) start_exclusive() is called with the BQL taken while another @@ -328,13 +328,13 @@ void process_queued_cpu_work(CPUState *cpu) } else { wi->func(cpu, wi->data); } - qemu_mutex_lock(&cpu->work_mutex); + qemu_mutex_lock(&cpu->lock); if (wi->free) { g_free(wi); } else { atomic_mb_set(&wi->done, true); } } - qemu_mutex_unlock(&cpu->work_mutex); + qemu_mutex_unlock(&cpu->lock); qemu_cond_broadcast(&qemu_work_cond); } diff --git a/cpus.c b/cpus.c index 151abbc04c..71bd2f5d55 100644 --- a/cpus.c +++ b/cpus.c @@ -100,9 +100,9 @@ static inline bool cpu_work_list_empty(CPUState *cpu) { bool ret; - qemu_mutex_lock(&cpu->work_mutex); + qemu_mutex_lock(&cpu->lock); ret = QSIMPLEQ_EMPTY(&cpu->work_list); - qemu_mutex_unlock(&cpu->work_mutex); + qemu_mutex_unlock(&cpu->lock); return ret; } diff --git a/hw/core/cpu.c b/hw/core/cpu.c index 2fc6aa2159..bc0416829a 100644 --- a/hw/core/cpu.c +++ b/hw/core/cpu.c @@ -367,7 +367,7 @@ static void cpu_common_initfn(Object *obj) cpu->nr_cores = 1; cpu->nr_threads = 1; - qemu_mutex_init(&cpu->work_mutex); + qemu_mutex_init(&cpu->lock); QSIMPLEQ_INIT(&cpu->work_list); QTAILQ_INIT(&cpu->breakpoints); QTAILQ_INIT(&cpu->watchpoints); @@ -379,7 +379,7 @@ static void cpu_common_finalize(Object *obj) { CPUState *cpu = CPU(obj); - qemu_mutex_destroy(&cpu->work_mutex); + qemu_mutex_destroy(cpu->lock); } static int64_t cpu_common_get_arch_id(CPUState *cpu) diff --git a/include/hw/core/cpu.h b/include/hw/core/cpu.h index 398b65159e..0b75fdb093 100644 --- a/include/hw/core/cpu.h +++ b/include/hw/core/cpu.h @@ -331,7 +331,8 @@ struct qemu_work_item; * @opaque: User data. * @mem_io_pc: Host Program Counter at which the memory was accessed. * @kvm_fd: vCPU file descriptor for KVM. - * @work_mutex: Lock to prevent multiple access to @work_list. + * @lock: Lock to prevent multiple access to per-CPU fields. Must be acquired + * after the BQL. * @work_list: List of pending asynchronous work. * @trace_dstate_delayed: Delayed changes to trace_dstate (includes all changes * to @trace_dstate). @@ -375,7 +376,8 @@ struct CPUState { uint64_t random_seed; sigjmp_buf jmp_env; - QemuMutex work_mutex; + QemuMutex lock; + /* fields below protected by @lock */ QSIMPLEQ_HEAD(, qemu_work_item) work_list; CPUAddressSpace *cpu_ases; -- 2.17.1