From 7401f6266de021990efc7bc212289219ba8f9a7a Mon Sep 17 00:00:00 2001 From: Bharat Bhushan Date: Mon, 31 Oct 2011 14:22:08 +0530 Subject: [PATCH] KVM: PPC: booke: Do Not start decrementer when SPRN_DEC set 0 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 Signed-off-by: Avi Kivity --- arch/powerpc/kvm/emulate.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/arch/powerpc/kvm/emulate.c b/arch/powerpc/kvm/emulate.c index 4337f99fa0fa..b6df56dd93ba 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 -- 2.45.2