KVM: PPC: Book3S HV: POWER9 more doorbell fixes

- 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")
Cc: stable@vger.kernel.org # v4.10+
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Paul Mackerras <paulus@ozlabs.org>

diff --git a/arch/powerpc/kvm/book3s_hv_rmhandlers.S b/arch/powerpc/kvm/book3s_hv_rmhandlers.S
index ec69fa45d5a2f249322d32218a722f4d54390e97..c700bedccaab652ccc4ccc1ca6598fc04390cd02 100644 (file)
--- a/arch/powerpc/kvm/book3s_hv_rmhandlers.S
+++ b/arch/powerpc/kvm/book3s_hv_rmhandlers.S
@@ -1310,6 +1310,7 @@ 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
@@ -2788,6 +2789,10 @@ 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