7c754c787e
The name "iothread" is overloaded. Use the term Big QEMU Lock (BQL) instead, it is already widely used and unambiguous. Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com> Reviewed-by: Cédric Le Goater <clg@kaod.org> Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org> Reviewed-by: Paul Durrant <paul@xen.org> Reviewed-by: Harsh Prateek Bora <harshpb@linux.ibm.com> Reviewed-by: Akihiko Odaki <akihiko.odaki@daynix.com> Message-id: 20240102153529.486531-4-stefanha@redhat.com Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
116 lines
3.0 KiB
C
116 lines
3.0 KiB
C
/*
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* QEMU Windows Hypervisor Platform accelerator (WHPX)
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*
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* Copyright Microsoft Corp. 2017
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*
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* This work is licensed under the terms of the GNU GPL, version 2 or later.
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* See the COPYING file in the top-level directory.
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*
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*/
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#include "qemu/osdep.h"
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#include "sysemu/kvm_int.h"
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#include "qemu/main-loop.h"
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#include "sysemu/cpus.h"
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#include "qemu/guest-random.h"
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#include "sysemu/whpx.h"
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#include "whpx-internal.h"
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#include "whpx-accel-ops.h"
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static void *whpx_cpu_thread_fn(void *arg)
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{
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CPUState *cpu = arg;
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int r;
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rcu_register_thread();
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bql_lock();
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qemu_thread_get_self(cpu->thread);
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cpu->thread_id = qemu_get_thread_id();
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current_cpu = cpu;
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r = whpx_init_vcpu(cpu);
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if (r < 0) {
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fprintf(stderr, "whpx_init_vcpu failed: %s\n", strerror(-r));
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exit(1);
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}
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/* signal CPU creation */
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cpu_thread_signal_created(cpu);
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qemu_guest_random_seed_thread_part2(cpu->random_seed);
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do {
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if (cpu_can_run(cpu)) {
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r = whpx_vcpu_exec(cpu);
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if (r == EXCP_DEBUG) {
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cpu_handle_guest_debug(cpu);
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}
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}
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while (cpu_thread_is_idle(cpu)) {
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qemu_cond_wait_bql(cpu->halt_cond);
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}
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qemu_wait_io_event_common(cpu);
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} while (!cpu->unplug || cpu_can_run(cpu));
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whpx_destroy_vcpu(cpu);
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cpu_thread_signal_destroyed(cpu);
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bql_unlock();
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rcu_unregister_thread();
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return NULL;
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}
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static void whpx_start_vcpu_thread(CPUState *cpu)
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{
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char thread_name[VCPU_THREAD_NAME_SIZE];
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cpu->thread = g_new0(QemuThread, 1);
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cpu->halt_cond = g_new0(QemuCond, 1);
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qemu_cond_init(cpu->halt_cond);
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snprintf(thread_name, VCPU_THREAD_NAME_SIZE, "CPU %d/WHPX",
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cpu->cpu_index);
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qemu_thread_create(cpu->thread, thread_name, whpx_cpu_thread_fn,
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cpu, QEMU_THREAD_JOINABLE);
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}
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static void whpx_kick_vcpu_thread(CPUState *cpu)
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{
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if (!qemu_cpu_is_self(cpu)) {
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whpx_vcpu_kick(cpu);
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}
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}
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static bool whpx_vcpu_thread_is_idle(CPUState *cpu)
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{
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return !whpx_apic_in_platform();
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}
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static void whpx_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->create_vcpu_thread = whpx_start_vcpu_thread;
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ops->kick_vcpu_thread = whpx_kick_vcpu_thread;
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ops->cpu_thread_is_idle = whpx_vcpu_thread_is_idle;
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ops->synchronize_post_reset = whpx_cpu_synchronize_post_reset;
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ops->synchronize_post_init = whpx_cpu_synchronize_post_init;
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ops->synchronize_state = whpx_cpu_synchronize_state;
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ops->synchronize_pre_loadvm = whpx_cpu_synchronize_pre_loadvm;
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ops->synchronize_pre_resume = whpx_cpu_synchronize_pre_resume;
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}
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static const TypeInfo whpx_accel_ops_type = {
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.name = ACCEL_OPS_NAME("whpx"),
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.parent = TYPE_ACCEL_OPS,
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.class_init = whpx_accel_ops_class_init,
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.abstract = true,
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};
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static void whpx_accel_ops_register_types(void)
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{
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type_register_static(&whpx_accel_ops_type);
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}
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type_init(whpx_accel_ops_register_types);
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