Patch "KVM: PPC: Book 3S: XICS: correct the real mode ICP rejecting counter" has been added to the 4.9-stable tree

Patch "KVM: PPC: Book 3S: XICS: correct the real mode ICP rejecting counter" has been added to the 4.9-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    KVM: PPC: Book 3S: XICS: correct the real mode ICP rejecting counter

to the 4.9-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     kvm-ppc-book-3s-xics-correct-the-real-mode-icp-rejecting-counter.patch
and it can be found in the queue-4.9 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From foo@baz Thu Nov  9 09:48:01 CET 2017
From: Li Zhong <zhong@linux.vnet.ibm.com>
Date: Fri, 11 Nov 2016 12:57:33 +0800
Subject: KVM: PPC: Book 3S: XICS: correct the real mode ICP rejecting counter

From: Li Zhong <zhong@linux.vnet.ibm.com>


[ Upstream commit 37451bc95dee0e666927d6ffdda302dbbaaae6fa ]

Some counters are added in Commit 6e0365b78273 ("KVM: PPC: Book3S HV:
Add ICP real mode counters"), to provide some performance statistics to
determine whether further optimizing is needed for real mode functions.

The n_reject counter counts how many times ICP rejects an irq because of
priority in real mode. The redelivery of an lsi that is still asserted
after eoi doesn't fall into this category, so the increasement there is
removed.

Also, it needs to be increased in icp_rm_deliver_irq() if it rejects
another one.

Signed-off-by: Li Zhong <zhong@linux.vnet.ibm.com>
Signed-off-by: Paul Mackerras <paulus@ozlabs.org>
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 arch/powerpc/kvm/book3s_hv_rm_xics.c |    5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

--- a/arch/powerpc/kvm/book3s_hv_rm_xics.c
+++ b/arch/powerpc/kvm/book3s_hv_rm_xics.c
@@ -376,6 +376,7 @@ static void icp_rm_deliver_irq(struct kv
 		 */
 		if (reject && reject != XICS_IPI) {
 			arch_spin_unlock(&ics->lock);
+			icp->n_reject++;
 			new_irq = reject;
 			goto again;
 		}
@@ -707,10 +708,8 @@ int kvmppc_rm_h_eoi(struct kvm_vcpu *vcp
 	state = &ics->irq_state[src];
 
 	/* Still asserted, resend it */
-	if (state->asserted) {
-		icp->n_reject++;
+	if (state->asserted)
 		icp_rm_deliver_irq(xics, icp, irq);
-	}
 
 	if (!hlist_empty(&vcpu->kvm->irq_ack_notifier_list)) {
 		icp->rm_action |= XICS_RM_NOTIFY_EOI;


Patches currently in stable-queue which might be from zhong@linux.vnet.ibm.com are

queue-4.9/crypto-vmx-disable-preemption-to-enable-vsx-in-aes_ctr.c.patch
queue-4.9/kvm-ppc-book-3s-xics-correct-the-real-mode-icp-rejecting-counter.patch