From: Diana Craciun <diana.craciun@nxp.com>
Date: Wed, 12 Dec 2018 14:03:07 +0000 (+0200)
Subject: powerpc/fsl: Flush branch predictor when entering KVM
X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=e7aa61f47b23afbec41031bc47ca8d6cb6516abc;p=openwrt%2Fstaging%2Fblogic.git

powerpc/fsl: Flush branch predictor when entering KVM

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>
---

diff --git a/arch/powerpc/kvm/bookehv_interrupts.S b/arch/powerpc/kvm/bookehv_interrupts.S
index 051af7d97327..4e5081e58409 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)