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

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

[gregkh]

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 <stable@vger.kernel.org> know about it.


>From 2cde3716321ec64a1faeaf567bd94100c7b4160f Mon Sep 17 00:00:00 2001
From: Nicholas Piggin <npiggin@gmail.com>
Date: Tue, 10 Oct 2017 20:18:28 +1000
Subject: KVM: PPC: Book3S HV: POWER9 more doorbell fixes

From: Nicholas Piggin <npiggin@gmail.com>

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).

Fixes: 1704a81ccebc ("KVM: PPC: Book3S HV: Use msgsnd for IPIs to other cores on POWER9")
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Paul Mackerras <paulus@ozlabs.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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

--- a/arch/powerpc/kvm/book3s_hv_rmhandlers.S
+++ b/arch/powerpc/kvm/book3s_hv_rmhandlers.S
@@ -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 npiggin@gmail.com are

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