[RFC 09/11] powerpc: kvm: handle time base on secondary hwthread

[kernelfans at gmail.com]

(This is a place holder patch.)
We need to store the time base for host on secondary hwthread.
Later when switching back, we need to reprogram it with elapse
time.

Signed-off-by: Liu Ping Fan <pingfank at linux.vnet.ibm.com>
---
 arch/powerpc/kvm/book3s_hv_rmhandlers.S | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/arch/powerpc/kvm/book3s_hv_rmhandlers.S b/arch/powerpc/kvm/book3s_hv_rmhandlers.S
index 89ea16c..a817ba6 100644
--- a/arch/powerpc/kvm/book3s_hv_rmhandlers.S
+++ b/arch/powerpc/kvm/book3s_hv_rmhandlers.S
@@ -371,6 +371,8 @@ _GLOBAL_TOC(kvmppc_secondary_stopper_enter)
 
 	/* fixme: store other register such as msr */
 
+	/* fixme: store the tb, and set it as MAX, so we cease the tick on secondary */
+
 	/* prevent us to enter kernel */
 	li	r0, 1
 	stb	r0, HSTATE_HWTHREAD_REQ(r13)
@@ -382,6 +384,10 @@ _GLOBAL_TOC(kvmppc_secondary_stopper_enter)
 
 /* enter with vmode */
 kvmppc_secondary_stopper_exit:
+	/* fixme: restore the tb, with the orig val plus time elapse
+         * so we can fire the hrtimer as soon as possible
+         */
+
 	/* fixme, restore the stack which we store on lpaca */
 
 	ld	r0, 112+PPC_LR_STKOFF(r1)
-- 
1.8.3.1