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authorNicholas Piggin <npiggin@gmail.com>2017-10-10 20:18:28 +1000
committerPaul Mackerras <paulus@ozlabs.org>2017-10-14 11:32:53 +1100
commit2cde3716321ec64a1faeaf567bd94100c7b4160f (patch)
tree2894440e99d3d8b0d92e9cafb5df18e8840cb721 /arch/powerpc
parentac64115a66c18c01745bbd3c47a36b124e5fd8c0 (diff)
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>
Diffstat (limited to 'arch/powerpc')
-rw-r--r--arch/powerpc/kvm/book3s_hv_rmhandlers.S5
1 files changed, 5 insertions, 0 deletions
diff --git a/arch/powerpc/kvm/book3s_hv_rmhandlers.S b/arch/powerpc/kvm/book3s_hv_rmhandlers.S
index ec69fa45d5a2..c700bedccaab 100644
--- 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