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| author |   Nicholas Piggin <npiggin@gmail.com> | 2017-03-13 03:03:49 +1000 |
|---|---|---|
| committer |   Paul Mackerras <paulus@ozlabs.org> | 2017-08-24 20:01:39 +1000 |
| commit | bd0fdb191c8523a9126bb14ac1b22cb47698ebf5 (patch) | |
| tree | 7887a3e0f241b09ecf4147c873a80676c1e40984 | |
| parent | Merge tag 'kvm-s390-master-4.13-2' of git://git.kernel.org/pub/scm/linux/kernel/git/kvms390/linux (diff) | |
| download | linux-dev-bd0fdb191c8523a9126bb14ac1b22cb47698ebf5.tar.xz linux-dev-bd0fdb191c8523a9126bb14ac1b22cb47698ebf5.zip | |
KVM: PPC: Book3S HV: Use msgsync with hypervisor doorbells on POWER9
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>
| -rw-r--r-- | arch/powerpc/kvm/book3s_hv_rmhandlers.S | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/arch/powerpc/kvm/book3s_hv_rmhandlers.S b/arch/powerpc/kvm/book3s_hv_rmhandlers.S index c52184a8efdf..9c9c983b864f 100644 --- a/arch/powerpc/kvm/book3s_hv_rmhandlers.S +++ b/arch/powerpc/kvm/book3s_hv_rmhandlers.S @@ -1291,6 +1291,9 @@ END_FTR_SECTION_IFSET(CPU_FTR_HAS_PPR) /* Hypervisor doorbell - exit only if host IPI flag set */ cmpwi r12, BOOK3S_INTERRUPT_H_DOORBELL bne 3f +BEGIN_FTR_SECTION + PPC_MSGSYNC +END_FTR_SECTION_IFSET(CPU_FTR_ARCH_300) lbz r0, HSTATE_HOST_IPI(r13) cmpwi r0, 0 beq 4f |