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cpus-common: move exclusive work infrastructure from linux-user

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This will serve as the base for async_safe_run_on_cpu.  Because
start_exclusive uses CPU_FOREACH, merge exclusive_lock with
qemu_cpu_list_lock: together with a call to exclusive_idle (via
cpu_exec_start/end) in cpu_list_add, this protects exclusive work
against concurrent CPU addition and removal.

Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Richard Henderson <rth@twiddle.net>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2016-08-31 16:56:04 +02:00
parent 0e55539c07
commit ab129972c8
5 changed files with 127 additions and 105 deletions
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44
include/qom/cpu.h
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@ -242,7 +242,8 @@ struct qemu_work_item;
* @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).
* @running: #true if CPU is currently running;
* valid under cpu_list_lock.
* @created: Indicates whether the CPU thread has been successfully created.
* @interrupt_request: Indicates a pending interrupt request.
* @halted: Nonzero if the CPU is in suspended state.
@ -818,6 +819,47 @@ void cpu_remove_sync(CPUState *cpu);
*/
void process_queued_cpu_work(CPUState *cpu);
/**
* cpu_exec_start:
* @cpu: The CPU for the current thread.
*
* Record that a CPU has started execution and can be interrupted with
* cpu_exit.
*/
void cpu_exec_start(CPUState *cpu);
/**
* cpu_exec_end:
* @cpu: The CPU for the current thread.
*
* Record that a CPU has stopped execution and exclusive sections
* can be executed without interrupting it.
*/
void cpu_exec_end(CPUState *cpu);
/**
* start_exclusive:
*
* Wait for a concurrent exclusive section to end, and then start
* a section of work that is run while other CPUs are not running
* between cpu_exec_start and cpu_exec_end. CPUs that are running
* cpu_exec are exited immediately. CPUs that call cpu_exec_start
* during the exclusive section go to sleep until this CPU calls
* end_exclusive.
*
* Returns with the CPU list lock taken (which nests outside all
* other locks except the BQL).
*/
void start_exclusive(void);
/**
* end_exclusive:
*
* Concludes an exclusive execution section started by start_exclusive.
* Releases the CPU list lock.
*/
void end_exclusive(void);
/**
* qemu_init_vcpu:
* @cpu: The vCPU to initialize.