[10/52] KVM: booke: Do Not start decrementer when SPRN_DEC set 0

Submitted by Alexander Graf on Jan. 13, 2012, 2:31 p.m.

Details

Message ID 1326465115-5976-11-git-send-email-agraf@suse.de
State New
Headers show

Commit Message

Alexander Graf Jan. 13, 2012, 2:31 p.m.
From: Bharat Bhushan <r65777@freescale.com>

As per specification the decrementer interrupt not happen when DEC is written with 0. Also when DEC is zero, no decrementer running. So we should not start hrtimer for decrementer when DEC = 0.

Signed-off-by: Bharat Bhushan <bharat.bhushan@freescale.com>
Signed-off-by: Alexander Graf <agraf@suse.de>
---
 arch/powerpc/kvm/emulate.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

Patch hide | download patch | download mbox

diff --git a/arch/powerpc/kvm/emulate.c b/arch/powerpc/kvm/emulate.c
index 4337f99..b6df56d 100644
--- a/arch/powerpc/kvm/emulate.c
+++ b/arch/powerpc/kvm/emulate.c
@@ -77,7 +77,8 @@  static int kvmppc_dec_enabled(struct kvm_vcpu *vcpu)
 #else
 static int kvmppc_dec_enabled(struct kvm_vcpu *vcpu)
 {
-	return vcpu->arch.tcr & TCR_DIE;
+	/* On BOOKE, DEC = 0 is as good as decrementer not enabled */
+	return (vcpu->arch.tcr & TCR_DIE) && vcpu->arch.dec;
 }
 #endif