linux-kernel - [PATCH 3/6] KVM: PPC: Book3S HV: Enable CPUs to run guest after waking up from fast-sleep

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Date:	Wed, 28 May 2014 10:09:04 +0530
From:	Preeti U Murthy <preeti@...ux.vnet.ibm.com>
To:	benh@...nel.crashing.org, linux-kernel@...r.kernel.org,
	svaidyan@...ibm.com, paulus@...ba.org,
	srivatsa.bhat@...ux.vnet.ibm.com, linuxppc-dev@...ts.ozlabs.org
Subject: [PATCH 3/6] KVM: PPC: Book3S HV: Enable CPUs to run guest after
 waking up from fast-sleep

From: Srivatsa S. Bhat <srivatsa.bhat@...ux.vnet.ibm.com>

When guests have to be launched, the secondary threads which are offline
are woken up to run the guests. Today these threads wake up from nap
and check if they have to run guests. Now that the offline secondary threads
can go to fastsleep, add this check in the fastsleep wakeup path as well.

Signed-off-by: Srivatsa S. Bhat <srivatsa.bhat@...ux.vnet.ibm.com>
[ Changelog added by <preeti@...ux.vnet.ibm.com> ]
Signed-off-by: Preeti U Murthy <preeti@...ux.vnet.ibm.com>
---

 arch/powerpc/kernel/exceptions-64s.S |   30 +++++++++++++++---------------
 1 file changed, 15 insertions(+), 15 deletions(-)

diff --git a/arch/powerpc/kernel/exceptions-64s.S b/arch/powerpc/kernel/exceptions-64s.S
index 3afd391..b4bf464 100644
--- a/arch/powerpc/kernel/exceptions-64s.S
+++ b/arch/powerpc/kernel/exceptions-64s.S
@@ -100,6 +100,19 @@ system_reset_pSeries:
 	SET_SCRATCH0(r13)
 #ifdef CONFIG_PPC_P7_NAP
 BEGIN_FTR_SECTION
+
+	GET_PACA(r13)
+#ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE
+	li	r0,KVM_HWTHREAD_IN_KERNEL
+	stb	r0,HSTATE_HWTHREAD_STATE(r13)
+	/* Order setting hwthread_state vs. testing hwthread_req */
+	sync
+	lbz	r0,HSTATE_HWTHREAD_REQ(r13)
+	cmpwi	r0,0
+	beq	1f
+	b	kvm_start_guest
+1:
+#endif
 	/* Running native on arch 2.06 or later, check if we are
 	 * waking up from nap. We only handle no state loss and
 	 * supervisor state loss. We do -not- handle hypervisor
@@ -116,28 +129,15 @@ BEGIN_FTR_SECTION
 	 * OPAL v3 based powernv platforms have new idle states
 	 * which fall in this catagory.
 	 */
-	bgt	cr1,8f
 	GET_PACA(r13)
-
-#ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE
-	li	r0,KVM_HWTHREAD_IN_KERNEL
-	stb	r0,HSTATE_HWTHREAD_STATE(r13)
-	/* Order setting hwthread_state vs. testing hwthread_req */
-	sync
-	lbz	r0,HSTATE_HWTHREAD_REQ(r13)
-	cmpwi	r0,0
-	beq	1f
-	b	kvm_start_guest
-1:
-#endif
+	bgt	cr1,8f
 
 	beq	cr1,2f
 	b	.power7_wakeup_noloss
 2:	b	.power7_wakeup_loss
 
 	/* Fast Sleep wakeup on PowerNV */
-8:	GET_PACA(r13)
-	b 	.power7_wakeup_tb_loss
+8:	b 	.power7_wakeup_tb_loss
 
 9:
 END_FTR_SECTION_IFSET(CPU_FTR_HVMODE | CPU_FTR_ARCH_206)

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