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KVM: PPC: booke: Do Not start decrementer when SPRN_DEC set 0

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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>
Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Bharat Bhushan 2011-10-31 14:22:08 +05:30 committed by Avi Kivity
parent dc2babfea5
commit 7401f6266d
1 changed files with 2 additions and 1 deletions
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3
arch/powerpc/kvm/emulate.c
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@ -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