From mboxrd@z Thu Jan 1 00:00:00 1970 From: Alexander Graf Date: Fri, 13 Jan 2012 14:31:13 +0000 Subject: [PATCH 10/52] KVM: booke: Do Not start decrementer when SPRN_DEC set 0 Message-Id: <1326465115-5976-11-git-send-email-agraf@suse.de> List-Id: References: <1326465115-5976-1-git-send-email-agraf@suse.de> In-Reply-To: <1326465115-5976-1-git-send-email-agraf@suse.de> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: kvm-ppc@vger.kernel.org Cc: kvm list , Avi Kivity , Marcelo Tosatti , Bharat Bhushan , Bharat Bhushan 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