linux-kernel - [PATCH V12 3/5] kvm : Fold pv_unhalt flag into GET_MP

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Date:	Tue, 06 Aug 2013 23:53:09 +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:	<agraf@...e.de>, linux-doc@...r.kernel.org,
	<habanero@...ux.vnet.ibm.com>, <riel@...hat.com>,
	Raghavendra K T <raghavendra.kt@...ux.vnet.ibm.com>,
	<drjones@...hat.com>, <avi.kivity@...il.com>,
	<peterz@...radead.org>, <andi@...stfloor.org>,
	<virtualization@...ts.linux-foundation.org>,
	<torvalds@...ux-foundation.org>, <tglx@...utronix.de>,
	<mtosatti@...hat.com>, <kvm@...r.kernel.org>,
	<srivatsa.vaddagiri@...il.com>, <ouyang@...pitt.edu>,
	<chegu_vinod@...com>, <linux-kernel@...r.kernel.org>
Subject: [PATCH V12 3/5] kvm : Fold pv_unhalt flag into GET_MP_STATE ioctl to aid migration

kvm : Fold pv_unhalt flag into GET_MP_STATE ioctl to aid migration

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

During migration, any vcpu that got kicked but did not become runnable
(still in halted state) should be runnable after migration.

Signed-off-by: Raghavendra K T <raghavendra.kt@...ux.vnet.ibm.com>
Acked-by: Gleb Natapov <gleb@...hat.com>
Acked-by: Ingo Molnar <mingo@...nel.org>
---
 arch/x86/kvm/x86.c |    7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index dae4575..1e73dab 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -6284,7 +6284,12 @@ int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu,
 				    struct kvm_mp_state *mp_state)
 {
 	kvm_apic_accept_events(vcpu);
-	mp_state->mp_state = vcpu->arch.mp_state;
+	if (vcpu->arch.mp_state == KVM_MP_STATE_HALTED &&
+					vcpu->arch.pv.pv_unhalted)
+		mp_state->mp_state = KVM_MP_STATE_RUNNABLE;
+	else
+		mp_state->mp_state = vcpu->arch.mp_state;
+
 	return 0;
 }
 

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