Add mfdec emulation

We support setting the DEC to a certain value right now. Doing that basically
triggers the CPU local timer.

But there's also an mfdec command that enabled the OS to read the decrementor.

This is required at least by all desktop and server PowerPC Linux kernels. It
can't really hurt to allow embedded ones to do it as well though.

Signed-off-by: Alexander Graf <agraf@suse.de>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

diff --git a/arch/powerpc/kvm/emulate.c b/arch/powerpc/kvm/emulate.c
index 7737146af3fb4c181a188c479786f8349a02c9ca..50d411d946eb6899d46f0e2201888418a81dd16f 100644 (file)
--- a/arch/powerpc/kvm/emulate.c
+++ b/arch/powerpc/kvm/emulate.c
@@ -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) {