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accel: Introduce AccelOpsClass::cpu_thread_is_idle()

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Add cpu_thread_is_idle() to AccelOps, and implement it for the
KVM / WHPX accelerators.

Suggested-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Message-Id: <20220207075426.81934-11-f4bug@amsat.org>
This commit is contained in:
Philippe Mathieu-Daudé 2022-02-03 01:58:55 +01:00
parent 5f74af8bab
commit ad7d684dfd
4 changed files with 17 additions and 2 deletions
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6
accel/kvm/kvm-accel-ops.c
View File

@ -74,11 +74,17 @@ static void kvm_start_vcpu_thread(CPUState *cpu)
cpu, QEMU_THREAD_JOINABLE);
}
static bool kvm_vcpu_thread_is_idle(CPUState *cpu)
{
return !kvm_halt_in_kernel();
}
static void kvm_accel_ops_class_init(ObjectClass *oc, void *data)
{
AccelOpsClass *ops = ACCEL_OPS_CLASS(oc);
ops->create_vcpu_thread = kvm_start_vcpu_thread;
ops->cpu_thread_is_idle = kvm_vcpu_thread_is_idle;
ops->synchronize_post_reset = kvm_cpu_synchronize_post_reset;
ops->synchronize_post_init = kvm_cpu_synchronize_post_init;
ops->synchronize_state = kvm_cpu_synchronize_state;

1
include/sysemu/accel-ops.h
View File

@ -30,6 +30,7 @@ struct AccelOpsClass {
void (*create_vcpu_thread)(CPUState *cpu); /* MANDATORY NON-NULL */
void (*kick_vcpu_thread)(CPUState *cpu);
bool (*cpu_thread_is_idle)(CPUState *cpu);
void (*synchronize_post_reset)(CPUState *cpu);
void (*synchronize_post_init)(CPUState *cpu);

6
softmmu/cpus.c
View File

@ -90,10 +90,12 @@ bool cpu_thread_is_idle(CPUState *cpu)
if (cpu_is_stopped(cpu)) {
return true;
}
if (!cpu->halted || cpu_has_work(cpu) ||
kvm_halt_in_kernel() || whpx_apic_in_platform()) {
if (!cpu->halted || cpu_has_work(cpu)) {
return false;
}
if (cpus_accel->cpu_thread_is_idle) {
return cpus_accel->cpu_thread_is_idle(cpu);
}
return true;
}

6
target/i386/whpx/whpx-accel-ops.c
View File

@ -83,12 +83,18 @@ static void whpx_kick_vcpu_thread(CPUState *cpu)
}
}
static bool whpx_vcpu_thread_is_idle(CPUState *cpu)
{
return !whpx_apic_in_platform();
}
static void whpx_accel_ops_class_init(ObjectClass *oc, void *data)
{
AccelOpsClass *ops = ACCEL_OPS_CLASS(oc);
ops->create_vcpu_thread = whpx_start_vcpu_thread;
ops->kick_vcpu_thread = whpx_kick_vcpu_thread;
ops->cpu_thread_is_idle = whpx_vcpu_thread_is_idle;
ops->synchronize_post_reset = whpx_cpu_synchronize_post_reset;
ops->synchronize_post_init = whpx_cpu_synchronize_post_init;