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KVM: Use cond_resched() directly and remove useless kvm_resched()

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Since the commit 15ad7146 ("KVM: Use the scheduler preemption notifiers
to make kvm preemptible"), the remaining stuff in this function is a
simple cond_resched() call with an extra need_resched() check which was
there to avoid dropping VCPUs unnecessarily.  Now it is meaningless.

Signed-off-by: Takuya Yoshikawa <yoshikawa_takuya_b1@lab.ntt.co.jp>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Takuya Yoshikawa 2013-12-13 15:07:21 +09:00 committed by Paolo Bonzini
parent 6bb05ef785
commit c08ac06ab3
5 changed files with 3 additions and 12 deletions
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2
arch/ia64/kvm/kvm-ia64.c
View File

@ -702,7 +702,7 @@ again:
out:
srcu_read_unlock(&vcpu->kvm->srcu, idx);
if (r > 0) {
kvm_resched(vcpu);
cond_resched();
idx = srcu_read_lock(&vcpu->kvm->srcu);
goto again;
}

2
arch/powerpc/kvm/book3s_hv.c
View File

@ -1348,7 +1348,7 @@ static void kvmppc_run_core(struct kvmppc_vcore *vc)
kvm_guest_exit();
preempt_enable();
kvm_resched(vcpu);
cond_resched();
spin_lock(&vc->lock);
now = get_tb();

2
arch/x86/kvm/x86.c
View File

@ -6125,7 +6125,7 @@ static int __vcpu_run(struct kvm_vcpu *vcpu)
}
if (need_resched()) {
srcu_read_unlock(&kvm->srcu, vcpu->srcu_idx);
kvm_resched(vcpu);
cond_resched();
vcpu->srcu_idx = srcu_read_lock(&kvm->srcu);
}
}

1
include/linux/kvm_host.h
View File

@ -583,7 +583,6 @@ void kvm_vcpu_block(struct kvm_vcpu *vcpu);
void kvm_vcpu_kick(struct kvm_vcpu *vcpu);
bool kvm_vcpu_yield_to(struct kvm_vcpu *target);
void kvm_vcpu_on_spin(struct kvm_vcpu *vcpu);
void kvm_resched(struct kvm_vcpu *vcpu);
void kvm_load_guest_fpu(struct kvm_vcpu *vcpu);
void kvm_put_guest_fpu(struct kvm_vcpu *vcpu);

8
virt/kvm/kvm_main.c
View File

@ -1710,14 +1710,6 @@ void kvm_vcpu_kick(struct kvm_vcpu *vcpu)
EXPORT_SYMBOL_GPL(kvm_vcpu_kick);
#endif /* !CONFIG_S390 */
void kvm_resched(struct kvm_vcpu *vcpu)
{
if (!need_resched())
return;
cond_resched();
}
EXPORT_SYMBOL_GPL(kvm_resched);
bool kvm_vcpu_yield_to(struct kvm_vcpu *target)
{
struct pid *pid;