linux-kernel - [PATCH RFC V10 16/18] kvm hypervisor : Simplify kvm_for_each_vcpu with kvm_irq_delivery_to

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Message-Id: <20130624124353.27508.94224.sendpatchset@codeblue.in.ibm.com>
Date:	Mon, 24 Jun 2013 18:13:53 +0530
From:	Raghavendra K T <raghavendra.kt@...ux.vnet.ibm.com>
To:	<gleb@...hat.com>, <mingo@...hat.com>, <jeremy@...p.org>,
	<x86@...nel.org>, <konrad.wilk@...cle.com>, <hpa@...or.com>,
	<pbonzini@...hat.com>
Cc:	linux-doc@...r.kernel.org, <habanero@...ux.vnet.ibm.com>,
	Raghavendra K T <raghavendra.kt@...ux.vnet.ibm.com>,
	<xen-devel@...ts.xensource.com>, <peterz@...radead.org>,
	<mtosatti@...hat.com>, <stefano.stabellini@...citrix.com>,
	<andi@...stfloor.org>, <attilio.rao@...rix.com>,
	<ouyang@...pitt.edu>, <gregkh@...e.de>, <agraf@...e.de>,
	<chegu_vinod@...com>, <torvalds@...ux-foundation.org>,
	<avi.kivity@...il.com>, <tglx@...utronix.de>,
	<kvm@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<stephan.diestelhorst@....com>, <riel@...hat.com>,
	<drjones@...hat.com>, <virtualization@...ts.linux-foundation.org>,
	<srivatsa.vaddagiri@...il.com>
Subject: [PATCH RFC V10 16/18] kvm hypervisor : Simplify kvm_for_each_vcpu with kvm_irq_delivery_to_apic

Simplify kvm_for_each_vcpu with kvm_irq_delivery_to_apic

From: Raghavendra K T <raghavendra.kt@...ux.vnet.ibm.com>

Note that we are using APIC_DM_REMRD which has reserved usage.
In future if APIC_DM_REMRD usage is standardized, then we should
find some other way or go back to old method.

Suggested-by: Gleb Natapov <gleb@...hat.com>
Signed-off-by: Raghavendra K T <raghavendra.kt@...ux.vnet.ibm.com>
---
 arch/x86/kvm/lapic.c |    5 ++++-
 arch/x86/kvm/x86.c   |   25 ++++++-------------------
 2 files changed, 10 insertions(+), 20 deletions(-)

diff --git a/arch/x86/kvm/lapic.c b/arch/x86/kvm/lapic.c
index e1adbb4..3f5f82e 100644
--- a/arch/x86/kvm/lapic.c
+++ b/arch/x86/kvm/lapic.c
@@ -706,7 +706,10 @@ out:
 		break;
 
 	case APIC_DM_REMRD:
-		apic_debug("Ignoring delivery mode 3\n");
+		result = 1;
+		vcpu->arch.pv.pv_unhalted = 1;
+		kvm_make_request(KVM_REQ_EVENT, vcpu);
+		kvm_vcpu_kick(vcpu);
 		break;
 
 	case APIC_DM_SMI:
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 92a9932..b963c86 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -5456,27 +5456,14 @@ int kvm_hv_hypercall(struct kvm_vcpu *vcpu)
  */
 static void kvm_pv_kick_cpu_op(struct kvm *kvm, int apicid)
 {
-	struct kvm_vcpu *vcpu = NULL;
-	int i;
+	struct kvm_lapic_irq lapic_irq;
 
-	kvm_for_each_vcpu(i, vcpu, kvm) {
-		if (!kvm_apic_present(vcpu))
-			continue;
+	lapic_irq.shorthand = 0;
+	lapic_irq.dest_mode = 0;
+	lapic_irq.dest_id = apicid;
 
-		if (kvm_apic_match_dest(vcpu, 0, 0, apicid, 0))
-			break;
-	}
-	if (vcpu) {
-		/*
-		 * Setting unhalt flag here can result in spurious runnable
-		 * state when unhalt reset does not happen in vcpu_block.
-		 * But that is harmless since that should soon result in halt.
-		 */
-		vcpu->arch.pv.pv_unhalted = true;
-		/* We need everybody see unhalt before vcpu unblocks */
-		smp_wmb();
-		kvm_vcpu_kick(vcpu);
-	}
+	lapic_irq.delivery_mode = APIC_DM_REMRD;
+	kvm_irq_delivery_to_apic(kvm, 0, &lapic_irq, NULL);
 }
 
 int kvm_emulate_hypercall(struct kvm_vcpu *vcpu)

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