From: Diana Craciun <diana.craciun@nxp.com>
To: stable@vger.kernel.org, gregkh@linuxfoundation.org
Cc: Diana Craciun <diana.craciun@nxp.com>, linuxppc-dev@ozlabs.org
Subject: [PATCH stable v4.4 2/8] powerpc/fsl: Flush branch predictor when entering KVM
Date: Mon, 29 Apr 2019 18:49:02 +0300 [thread overview]
Message-ID: <1556552948-24957-3-git-send-email-diana.craciun@nxp.com> (raw)
In-Reply-To: <1556552948-24957-1-git-send-email-diana.craciun@nxp.com>
commit e7aa61f47b23afbec41031bc47ca8d6cb6516abc upstream.
Switching from the guest to host is another place
where the speculative accesses can be exploited.
Flush the branch predictor when entering KVM.
Signed-off-by: Diana Craciun <diana.craciun@nxp.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
---
arch/powerpc/kvm/bookehv_interrupts.S | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/arch/powerpc/kvm/bookehv_interrupts.S b/arch/powerpc/kvm/bookehv_interrupts.S
index 81bd8a07aa51..612b7f6a887f 100644
--- a/arch/powerpc/kvm/bookehv_interrupts.S
+++ b/arch/powerpc/kvm/bookehv_interrupts.S
@@ -75,6 +75,10 @@
PPC_LL r1, VCPU_HOST_STACK(r4)
PPC_LL r2, HOST_R2(r1)
+START_BTB_FLUSH_SECTION
+ BTB_FLUSH(r10)
+END_BTB_FLUSH_SECTION
+
mfspr r10, SPRN_PID
lwz r8, VCPU_HOST_PID(r4)
PPC_LL r11, VCPU_SHARED(r4)
--
2.17.1
next prev parent reply other threads:[~2019-04-29 16:08 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-04-29 15:49 [PATCH stable v4.4 0/8] missing powerpc spectre backports for 4.4 Diana Craciun
2019-04-29 15:49 ` [PATCH stable v4.4 1/8] powerpc/fsl: Enable runtime patching if nospectre_v2 boot arg is used Diana Craciun
2019-04-30 10:40 ` Patch "powerpc/fsl: Enable runtime patching if nospectre_v2 boot arg is used" has been added to the 4.4-stable tree gregkh
2019-04-29 15:49 ` Diana Craciun [this message]
2019-04-30 10:40 ` Patch "powerpc/fsl: Flush branch predictor when entering KVM" " gregkh
2019-04-29 15:49 ` [PATCH stable v4.4 3/8] powerpc/fsl: Emulate SPRN_BUCSR register Diana Craciun
2019-04-30 10:40 ` Patch "powerpc/fsl: Emulate SPRN_BUCSR register" has been added to the 4.4-stable tree gregkh
2019-04-29 15:49 ` [PATCH stable v4.4 4/8] powerpc/fsl: Flush the branch predictor at each kernel entry (32 bit) Diana Craciun
2019-04-30 10:40 ` Patch "powerpc/fsl: Flush the branch predictor at each kernel entry (32 bit)" has been added to the 4.4-stable tree gregkh
2019-04-29 15:49 ` [PATCH stable v4.4 5/8] powerpc/fsl: Sanitize the syscall table for NXP PowerPC 32 bit platforms Diana Craciun
2019-04-30 10:40 ` Patch "powerpc/fsl: Sanitize the syscall table for NXP PowerPC 32 bit platforms" has been added to the 4.4-stable tree gregkh
2019-04-29 15:49 ` [PATCH stable v4.4 6/8] powerpc/fsl: Fixed warning: orphan section `__btb_flush_fixup' Diana Craciun
2019-04-30 10:40 ` Patch "powerpc/fsl: Fixed warning: orphan section `__btb_flush_fixup'" has been added to the 4.4-stable tree gregkh
2019-04-29 15:49 ` [PATCH stable v4.4 7/8] powerpc/fsl: Add FSL_PPC_BOOK3E as supported arch for nospectre_v2 boot arg Diana Craciun
2019-04-30 10:37 ` Greg KH
2019-04-29 15:49 ` [PATCH stable v4.4 8/8] Documentation: Add nospectre_v1 parameter Diana Craciun
2019-04-30 10:38 ` Greg KH
2019-04-30 10:41 ` [PATCH stable v4.4 0/8] missing powerpc spectre backports for 4.4 Greg KH
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