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cpus: protect work list with work_mutex 

Protect the list of queued work items with something other than
the BQL, as a preparation for running the work items outside it.

Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: KONRAD Frederic <fred.konrad@greensocs.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2015-07-10 12:32:32 +02:00
parent 0c71d41e2a
commit 376692b9dc
3 changed files with 24 additions and 5 deletions
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22
cpus.c
View File

@ -819,6 +819,8 @@ void run_on_cpu(CPUState *cpu, void (*func)(void *data), void *data)
wi.func = func;
wi.data = data;
wi.free = false;
qemu_mutex_lock(&cpu->work_mutex);
if (cpu->queued_work_first == NULL) {
cpu->queued_work_first = &wi;
} else {
@ -827,9 +829,10 @@ void run_on_cpu(CPUState *cpu, void (*func)(void *data), void *data)
cpu->queued_work_last = &wi;
wi.next = NULL;
wi.done = false;
qemu_mutex_unlock(&cpu->work_mutex);
qemu_cpu_kick(cpu);
while (!wi.done) {
while (!atomic_mb_read(&wi.done)) {
CPUState *self_cpu = current_cpu;
qemu_cond_wait(&qemu_work_cond, &qemu_global_mutex);
@ -850,6 +853,8 @@ void async_run_on_cpu(CPUState *cpu, void (*func)(void *data), void *data)
wi->func = func;
wi->data = data;
wi->free = true;
qemu_mutex_lock(&cpu->work_mutex);
if (cpu->queued_work_first == NULL) {
cpu->queued_work_first = wi;
} else {
@ -858,6 +863,7 @@ void async_run_on_cpu(CPUState *cpu, void (*func)(void *data), void *data)
cpu->queued_work_last = wi;
wi->next = NULL;
wi->done = false;
qemu_mutex_unlock(&cpu->work_mutex);
qemu_cpu_kick(cpu);
}
@ -870,15 +876,23 @@ static void flush_queued_work(CPUState *cpu)
return;
}
while ((wi = cpu->queued_work_first)) {
qemu_mutex_lock(&cpu->work_mutex);
while (cpu->queued_work_first != NULL) {
wi = cpu->queued_work_first;
cpu->queued_work_first = wi->next;
if (!cpu->queued_work_first) {
cpu->queued_work_last = NULL;
}
qemu_mutex_unlock(&cpu->work_mutex);
wi->func(wi->data);
wi->done = true;
qemu_mutex_lock(&cpu->work_mutex);
if (wi->free) {
g_free(wi);
} else {
atomic_mb_set(&wi->done, true);
}
}
cpu->queued_work_last = NULL;
qemu_mutex_unlock(&cpu->work_mutex);
qemu_cond_broadcast(&qemu_work_cond);
}

6
include/qom/cpu.h
View File

@ -243,6 +243,8 @@ struct kvm_run;
* @mem_io_pc: Host Program Counter at which the memory was accessed.
* @mem_io_vaddr: Target virtual address at which the memory was accessed.
* @kvm_fd: vCPU file descriptor for KVM.
* @work_mutex: Lock to prevent multiple access to queued_work_*.
* @queued_work_first: First asynchronous work pending.
*
* State of one CPU core or thread.
*/
@ -263,7 +265,6 @@ struct CPUState {
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;
@ -274,6 +275,9 @@ struct CPUState {
int64_t icount_extra;
sigjmp_buf jmp_env;
QemuMutex work_mutex;
struct qemu_work_item *queued_work_first, *queued_work_last;
AddressSpace *as;
struct AddressSpaceDispatch *memory_dispatch;
MemoryListener *tcg_as_listener;

1
qom/cpu.c
View File

@ -316,6 +316,7 @@ static void cpu_common_initfn(Object *obj)
cpu->cpu_index = -1;
cpu->gdb_num_regs = cpu->gdb_num_g_regs = cc->gdb_num_core_regs;
qemu_mutex_init(&cpu->work_mutex);
QTAILQ_INIT(&cpu->breakpoints);
QTAILQ_INIT(&cpu->watchpoints);
}