Patch "KVM: PPC: Book3S HV: POWER9 more doorbell fixes" has been added to the 4.13-stable tree

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

KVM: PPC: Book3S HV: POWER9 more doorbell fixes

to the 4.13-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-book3s-hv-power9-more-doorbell-fixes.patch
and it can be found in the queue-4.13 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: Nicholas Piggin <[email protected]>
Date: Tue, 10 Oct 2017 20:18:28 +1000
Subject: KVM: PPC: Book3S HV: POWER9 more doorbell fixes

From: Nicholas Piggin <[email protected]>

commit 2cde3716321ec64a1faeaf567bd94100c7b4160f upstream.

- Add another case where msgsync is required.
- Required barrier sequence for global doorbells is msgsync ; lwsync

When msgsnd is used for IPIs to other cores, msgsync must be executed by the target to order stores performed on the source before its msgsnd (provided the source executes the appropriate sync).

---
 arch/powerpc/kvm/book3s_hv_rmhandlers.S |    5 +++++
 1 file changed, 5 insertions(+)

@@ -1296,6 +1296,7 @@ END_FTR_SECTION_IFSET(CPU_FTR_HAS_PPR)
 	bne	3f
 BEGIN_FTR_SECTION
 	PPC_MSGSYNC
+	lwsync
 END_FTR_SECTION_IFSET(CPU_FTR_ARCH_300)
 	lbz	r0, HSTATE_HOST_IPI(r13)
 	cmpwi	r0, 0

@@ -2767,6 +2768,10 @@ END_FTR_SECTION_IFSET(CPU_FTR_ARCH_207S)
 	PPC_MSGCLR(6)
 	/* see if it's a host IPI */
 	li	r3, 1
+BEGIN_FTR_SECTION
+	PPC_MSGSYNC
+	lwsync
+END_FTR_SECTION_IFSET(CPU_FTR_ARCH_300)
 	lbz	r0, HSTATE_HOST_IPI(r13)
 	cmpwi	r0, 0
 	bnelr

Patches currently in stable-queue which might be from [email protected] are

queue-4.13/kvm-ppc-book3s-hv-power9-more-doorbell-fixes.patch