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-rw-r--r--arch/powerpc/kvm/emulate.c61
1 files changed, 32 insertions, 29 deletions
diff --git a/arch/powerpc/kvm/emulate.c b/arch/powerpc/kvm/emulate.c
index 141dce3c6810..968f40101883 100644
--- a/arch/powerpc/kvm/emulate.c
+++ b/arch/powerpc/kvm/emulate.c
@@ -13,6 +13,7 @@
* Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
* Copyright IBM Corp. 2007
+ * Copyright 2011 Freescale Semiconductor, Inc.
*
* Authors: Hollis Blanchard <hollisb@us.ibm.com>
*/
@@ -69,54 +70,55 @@
#define OP_STH 44
#define OP_STHU 45
-#ifdef CONFIG_PPC_BOOK3S
-static int kvmppc_dec_enabled(struct kvm_vcpu *vcpu)
-{
- return 1;
-}
-#else
-static int kvmppc_dec_enabled(struct kvm_vcpu *vcpu)
-{
- return vcpu->arch.tcr & TCR_DIE;
-}
-#endif
-
void kvmppc_emulate_dec(struct kvm_vcpu *vcpu)
{
unsigned long dec_nsec;
+ unsigned long long dec_time;
pr_debug("mtDEC: %x\n", vcpu->arch.dec);
+ hrtimer_try_to_cancel(&vcpu->arch.dec_timer);
+
#ifdef CONFIG_PPC_BOOK3S
/* mtdec lowers the interrupt line when positive. */
kvmppc_core_dequeue_dec(vcpu);
/* POWER4+ triggers a dec interrupt if the value is < 0 */
if (vcpu->arch.dec & 0x80000000) {
- hrtimer_try_to_cancel(&vcpu->arch.dec_timer);
kvmppc_core_queue_dec(vcpu);
return;
}
#endif
- if (kvmppc_dec_enabled(vcpu)) {
- /* The decrementer ticks at the same rate as the timebase, so
- * that's how we convert the guest DEC value to the number of
- * host ticks. */
-
- hrtimer_try_to_cancel(&vcpu->arch.dec_timer);
- dec_nsec = vcpu->arch.dec;
- dec_nsec *= 1000;
- dec_nsec /= tb_ticks_per_usec;
- hrtimer_start(&vcpu->arch.dec_timer, ktime_set(0, dec_nsec),
- HRTIMER_MODE_REL);
- vcpu->arch.dec_jiffies = get_tb();
- } else {
- hrtimer_try_to_cancel(&vcpu->arch.dec_timer);
- }
+
+#ifdef CONFIG_BOOKE
+ /* On BOOKE, DEC = 0 is as good as decrementer not enabled */
+ if (vcpu->arch.dec == 0)
+ return;
+#endif
+
+ /*
+ * The decrementer ticks at the same rate as the timebase, so
+ * that's how we convert the guest DEC value to the number of
+ * host ticks.
+ */
+
+ dec_time = vcpu->arch.dec;
+ dec_time *= 1000;
+ do_div(dec_time, tb_ticks_per_usec);
+ dec_nsec = do_div(dec_time, NSEC_PER_SEC);
+ hrtimer_start(&vcpu->arch.dec_timer,
+ ktime_set(dec_time, dec_nsec), HRTIMER_MODE_REL);
+ vcpu->arch.dec_jiffies = get_tb();
}
u32 kvmppc_get_dec(struct kvm_vcpu *vcpu, u64 tb)
{
u64 jd = tb - vcpu->arch.dec_jiffies;
+
+#ifdef CONFIG_BOOKE
+ if (vcpu->arch.dec < jd)
+ return 0;
+#endif
+
return vcpu->arch.dec - jd;
}
@@ -159,7 +161,8 @@ int kvmppc_emulate_instruction(struct kvm_run *run, struct kvm_vcpu *vcpu)
case OP_TRAP_64:
kvmppc_core_queue_program(vcpu, SRR1_PROGTRAP);
#else
- kvmppc_core_queue_program(vcpu, vcpu->arch.esr | ESR_PTR);
+ kvmppc_core_queue_program(vcpu,
+ vcpu->arch.shared->esr | ESR_PTR);
#endif
advance = 0;
break;