@@ -66,12 +66,14 @@
void kvmppc_emulate_dec(struct kvm_vcpu *vcpu)
{
+ unsigned long nr_jiffies;
+
if (vcpu->arch.tcr & TCR_DIE) {
/* 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. */
- unsigned long nr_jiffies;
+ vcpu->arch.dec_jiffies = mftb();
nr_jiffies = vcpu->arch.dec / tb_ticks_per_jiffy;
mod_timer(&vcpu->arch.dec_timer,
get_jiffies_64() + nr_jiffies);
@@ -211,6 +213,15 @@ int kvmppc_emulate_instruction(struct kvm_run *run, struct kvm_vcpu *vcpu)
/* Note: SPRG4-7 are user-readable, so we don't get
* a trap. */
+ case SPRN_DEC:
+ {
+ u64 jd = mftb() - vcpu->arch.dec_jiffies;
+ vcpu->arch.gpr[rt] = vcpu->arch.dec - jd;
+#ifdef DEBUG_EMUL
+ printk(KERN_INFO "mfDEC: %x - %llx = %lx\n", vcpu->arch.dec, jd, vcpu->arch.gpr[rt]);
+#endif
+ break;
+ }
default:
emulated = kvmppc_core_emulate_mfspr(vcpu, sprn, rt);
if (emulated == EMULATE_FAIL) {