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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: 1704a81cce ("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>
This commit is contained in:
Nicholas Piggin 2017-03-13 03:03:49 +10:00 committed by Paul Mackerras
parent f2d8421b88
commit bd0fdb191c
1 changed files with 3 additions and 0 deletions
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arch/powerpc/kvm/book3s_hv_rmhandlers.S
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@ -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