6cc9d67c6f
The primary motivation is to remove a dozen insns along the fast-path in tb_lookup. As a byproduct, this allows us to completely remove parallel_cpus. Reviewed-by: Alex Bennée <alex.bennee@linaro.org> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
134 lines
4.0 KiB
C
134 lines
4.0 KiB
C
/*
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* QEMU TCG vCPU common functionality
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*
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* Functionality common to all TCG vCPU variants: mttcg, rr and icount.
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*
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* Copyright (c) 2003-2008 Fabrice Bellard
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* Copyright (c) 2014 Red Hat Inc.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include "qemu/osdep.h"
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#include "qemu-common.h"
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#include "sysemu/tcg.h"
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#include "sysemu/replay.h"
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#include "qemu/main-loop.h"
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#include "qemu/guest-random.h"
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#include "exec/exec-all.h"
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#include "hw/boards.h"
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#include "tcg-accel-ops.h"
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#include "tcg-accel-ops-mttcg.h"
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#include "tcg-accel-ops-rr.h"
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#include "tcg-accel-ops-icount.h"
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/* common functionality among all TCG variants */
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void tcg_cpu_init_cflags(CPUState *cpu, bool parallel)
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{
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uint32_t cflags = cpu->cluster_index << CF_CLUSTER_SHIFT;
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cflags |= parallel ? CF_PARALLEL : 0;
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cflags |= icount_enabled() ? CF_USE_ICOUNT : 0;
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cpu->tcg_cflags = cflags;
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}
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void tcg_cpus_destroy(CPUState *cpu)
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{
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cpu_thread_signal_destroyed(cpu);
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}
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int tcg_cpus_exec(CPUState *cpu)
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{
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int ret;
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#ifdef CONFIG_PROFILER
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int64_t ti;
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#endif
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assert(tcg_enabled());
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#ifdef CONFIG_PROFILER
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ti = profile_getclock();
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#endif
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cpu_exec_start(cpu);
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ret = cpu_exec(cpu);
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cpu_exec_end(cpu);
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#ifdef CONFIG_PROFILER
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qatomic_set(&tcg_ctx->prof.cpu_exec_time,
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tcg_ctx->prof.cpu_exec_time + profile_getclock() - ti);
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#endif
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return ret;
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}
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/* mask must never be zero, except for A20 change call */
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void tcg_handle_interrupt(CPUState *cpu, int mask)
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{
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g_assert(qemu_mutex_iothread_locked());
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cpu->interrupt_request |= mask;
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/*
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* If called from iothread context, wake the target cpu in
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* case its halted.
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*/
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if (!qemu_cpu_is_self(cpu)) {
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qemu_cpu_kick(cpu);
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} else {
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qatomic_set(&cpu_neg(cpu)->icount_decr.u16.high, -1);
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}
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}
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static void tcg_accel_ops_init(AccelOpsClass *ops)
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{
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if (qemu_tcg_mttcg_enabled()) {
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ops->create_vcpu_thread = mttcg_start_vcpu_thread;
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ops->kick_vcpu_thread = mttcg_kick_vcpu_thread;
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ops->handle_interrupt = tcg_handle_interrupt;
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} else if (icount_enabled()) {
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ops->create_vcpu_thread = rr_start_vcpu_thread;
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ops->kick_vcpu_thread = rr_kick_vcpu_thread;
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ops->handle_interrupt = icount_handle_interrupt;
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ops->get_virtual_clock = icount_get;
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ops->get_elapsed_ticks = icount_get;
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} else {
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ops->create_vcpu_thread = rr_start_vcpu_thread;
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ops->kick_vcpu_thread = rr_kick_vcpu_thread;
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ops->handle_interrupt = tcg_handle_interrupt;
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}
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}
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static void tcg_accel_ops_class_init(ObjectClass *oc, void *data)
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{
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AccelOpsClass *ops = ACCEL_OPS_CLASS(oc);
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ops->ops_init = tcg_accel_ops_init;
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}
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static const TypeInfo tcg_accel_ops_type = {
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.name = ACCEL_OPS_NAME("tcg"),
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.parent = TYPE_ACCEL_OPS,
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.class_init = tcg_accel_ops_class_init,
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.abstract = true,
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};
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static void tcg_accel_ops_register_types(void)
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{
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type_register_static(&tcg_accel_ops_type);
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}
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type_init(tcg_accel_ops_register_types);
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