diff mbox series

[08/11] powerpc/fsl: Flush branch predictor when entering KVM

Message ID 1544623390-18710-9-git-send-email-diana.craciun@nxp.com (mailing list archive)
State Accepted
Commit e7aa61f47b23afbec41031bc47ca8d6cb6516abc
Headers show
Series powerpc/fsl: NXP PowerPC Spectre variant 2 workarounds | expand

Checks

Context Check Description
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snowpatch_ozlabs/checkpatch success total: 0 errors, 0 warnings, 0 checks, 10 lines checked

Commit Message

Diana Craciun Dec. 12, 2018, 2:03 p.m. UTC 
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>
---
 arch/powerpc/kvm/bookehv_interrupts.S | 4 ++++
 1 file changed, 4 insertions(+)
diff mbox series

Patch

diff --git a/arch/powerpc/kvm/bookehv_interrupts.S b/arch/powerpc/kvm/bookehv_interrupts.S
index 051af7d..4e5081e 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)