[15/27] Add mfdec emulation

Submitted by Alexander Graf on Oct. 30, 2009, 3:47 p.m.

Details

Message ID 1256917647-6200-16-git-send-email-agraf@suse.de
State Accepted, archived
Commit 9a7a9b09fee8487003df012d9af4b227b3661e4d
Delegated to: Benjamin Herrenschmidt
Headers show

Commit Message

Alexander Graf Oct. 30, 2009, 3:47 p.m.
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>
---
 arch/powerpc/kvm/emulate.c |   13 ++++++++++++-
 1 files changed, 12 insertions(+), 1 deletions(-)

Patch hide | download patch | download mbox

diff --git a/arch/powerpc/kvm/emulate.c b/arch/powerpc/kvm/emulate.c
index 7737146..50d411d 100644
--- 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) {