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

Alexander Graf
2012-01-13T14:58:35Z

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(-)

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