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@xxxxxxxxxxxxxxx> know about it. >From 2cde3716321ec64a1faeaf567bd94100c7b4160f Mon Sep 17 00:00:00 2001 From: Nicholas Piggin <npiggin@xxxxxxxxx> Date: Tue, 10 Oct 2017 20:18:28 +1000 Subject: KVM: PPC: Book3S HV: POWER9 more doorbell fixes From: Nicholas Piggin <npiggin@xxxxxxxxx> 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@xxxxxxxxx> Signed-off-by: Paul Mackerras <paulus@xxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- 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@xxxxxxxxx are queue-4.13/kvm-ppc-book3s-hv-power9-more-doorbell-fixes.patch