From mboxrd@z Thu Jan 1 00:00:00 1970 From: Alexander Graf Subject: [PATCH 10/52] KVM: booke: Do Not start decrementer when SPRN_DEC set 0 Date: Fri, 13 Jan 2012 15:31:13 +0100 Message-ID: <1326465115-5976-11-git-send-email-agraf@suse.de> References: <1326465115-5976-1-git-send-email-agraf@suse.de> Cc: kvm list , Avi Kivity , Marcelo Tosatti , Bharat Bhushan , Bharat Bhushan To: kvm-ppc@vger.kernel.org Return-path: Received: from cantor2.suse.de ([195.135.220.15]:59526 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1758263Ab2AMO6f (ORCPT ); Fri, 13 Jan 2012 09:58:35 -0500 In-Reply-To: <1326465115-5976-1-git-send-email-agraf@suse.de> Sender: kvm-owner@vger.kernel.org List-ID: From: Bharat Bhushan 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 Signed-off-by: Alexander Graf --- arch/powerpc/kvm/emulate.c | 3 ++- 1 files changed, 2 insertions(+), 1 deletions(-) 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 -- 1.6.0.2