diff options
| author | Nicholas Piggin <npiggin@gmail.com> | 2017-10-10 13:18:28 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-11-02 11:54:45 +0300 |
| commit | 39418e2c388ffd74703b67d727ed439f6e3fc09f (patch) | |
| tree | d790892064150fd283d56a5874fddcfa576882d4 /arch | |
| parent | 3f3414599f110c8dce4e0b0d51502fc8c07517d7 (diff) | |
| download | linux-39418e2c388ffd74703b67d727ed439f6e3fc09f.tar.xz | |
KVM: PPC: Book3S HV: POWER9 more doorbell fixes
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@gmail.com>
Signed-off-by: Paul Mackerras <paulus@ozlabs.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/powerpc/kvm/book3s_hv_rmhandlers.S | 5 |
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 dc58c2a560f9..e92cb5fd28f2 100644 --- 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 |