From e7aa61f47b23afbec41031bc47ca8d6cb6516abc Mon Sep 17 00:00:00 2001 From: Diana Craciun Date: Wed, 12 Dec 2018 16:03:07 +0200 Subject: [PATCH] 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 Signed-off-by: Michael Ellerman --- 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 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) -- 2.30.2