linux-kernel - [PATCH 1/2] KVM: x86: extract guest running logic from __vcpu

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Date:	Fri,  6 Feb 2015 13:16:58 +0100
From:	Paolo Bonzini <pbonzini@...hat.com>
To:	linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Cc:	riel@...hat.com, mtosatti@...hat.com, rkrcmar@...hat.com,
	dmatlack@...gle.com
Subject: [PATCH 1/2] KVM: x86: extract guest running logic from __vcpu_run

Rename the old __vcpu_run to vcpu_run, and extract its main logic
to a new function.

The next patch will add a new early-exit condition to __vcpu_run,
avoid extra indentation.

Signed-off-by: Paolo Bonzini <pbonzini@...hat.com>
---
 arch/x86/kvm/x86.c | 67 +++++++++++++++++++++++++++++-------------------------
 1 file changed, 36 insertions(+), 31 deletions(-)

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index bd7a70be41b3..0b8dd13676ef 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -6165,7 +6165,7 @@ void kvm_arch_mmu_notifier_invalidate_page(struct kvm *kvm,
 }
 
 /*
- * Returns 1 to let __vcpu_run() continue the guest execution loop without
+ * Returns 1 to let vcpu_run() continue the guest execution loop without
  * exiting to the userspace.  Otherwise, the value will be returned to the
  * userspace.
  */
@@ -6383,42 +6383,45 @@ out:
 	return r;
 }
 
+static inline int __vcpu_run(struct kvm *kvm, struct kvm_vcpu *vcpu)
+{
+	if (vcpu->arch.mp_state == KVM_MP_STATE_RUNNABLE &&
+	    !vcpu->arch.apf.halted)
+		return vcpu_enter_guest(vcpu);
+
+	srcu_read_unlock(&kvm->srcu, vcpu->srcu_idx);
+	kvm_vcpu_block(vcpu);
+	vcpu->srcu_idx = srcu_read_lock(&kvm->srcu);
+	if (!kvm_check_request(KVM_REQ_UNHALT, vcpu))
+		return 1;
 
-static int __vcpu_run(struct kvm_vcpu *vcpu)
+	kvm_apic_accept_events(vcpu);
+	switch(vcpu->arch.mp_state) {
+	case KVM_MP_STATE_HALTED:
+		vcpu->arch.pv.pv_unhalted = false;
+		vcpu->arch.mp_state =
+			KVM_MP_STATE_RUNNABLE;
+	case KVM_MP_STATE_RUNNABLE:
+		vcpu->arch.apf.halted = false;
+		break;
+	case KVM_MP_STATE_INIT_RECEIVED:
+		break;
+	default:
+		return -EINTR;
+		break;
+	}
+	return 1;
+}
+
+static int vcpu_run(struct kvm_vcpu *vcpu)
 {
 	int r;
 	struct kvm *kvm = vcpu->kvm;
 
 	vcpu->srcu_idx = srcu_read_lock(&kvm->srcu);
 
-	r = 1;
-	while (r > 0) {
-		if (vcpu->arch.mp_state == KVM_MP_STATE_RUNNABLE &&
-		    !vcpu->arch.apf.halted)
-			r = vcpu_enter_guest(vcpu);
-		else {
-			srcu_read_unlock(&kvm->srcu, vcpu->srcu_idx);
-			kvm_vcpu_block(vcpu);
-			vcpu->srcu_idx = srcu_read_lock(&kvm->srcu);
-			if (kvm_check_request(KVM_REQ_UNHALT, vcpu)) {
-				kvm_apic_accept_events(vcpu);
-				switch(vcpu->arch.mp_state) {
-				case KVM_MP_STATE_HALTED:
-					vcpu->arch.pv.pv_unhalted = false;
-					vcpu->arch.mp_state =
-						KVM_MP_STATE_RUNNABLE;
-				case KVM_MP_STATE_RUNNABLE:
-					vcpu->arch.apf.halted = false;
-					break;
-				case KVM_MP_STATE_INIT_RECEIVED:
-					break;
-				default:
-					r = -EINTR;
-					break;
-				}
-			}
-		}
-
+	for (;;) {
+		r = __vcpu_run(kvm, vcpu);
 		if (r <= 0)
 			break;
 
@@ -6430,6 +6433,7 @@ static int __vcpu_run(struct kvm_vcpu *vcpu)
 			r = -EINTR;
 			vcpu->run->exit_reason = KVM_EXIT_INTR;
 			++vcpu->stat.request_irq_exits;
+			break;
 		}
 
 		kvm_check_async_pf_completion(vcpu);
@@ -6438,6 +6442,7 @@ static int __vcpu_run(struct kvm_vcpu *vcpu)
 			r = -EINTR;
 			vcpu->run->exit_reason = KVM_EXIT_INTR;
 			++vcpu->stat.signal_exits;
+			break;
 		}
 		if (need_resched()) {
 			srcu_read_unlock(&kvm->srcu, vcpu->srcu_idx);
@@ -6569,7 +6574,7 @@ int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
 	} else
 		WARN_ON(vcpu->arch.pio.count || vcpu->mmio_needed);
 
-	r = __vcpu_run(vcpu);
+	r = vcpu_run(vcpu);
 
 out:
 	post_kvm_run_save(vcpu);
-- 
1.8.3.1


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