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Commit 3f7e8e2e authored by Marc Zyngier's avatar Marc Zyngier Committed by Russell King
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ARM: KVM: invalidate BTB on guest exit for Cortex-A12/A17



In order to avoid aliasing attacks against the branch predictor,
let's invalidate the BTB on guest exit. This is made complicated
by the fact that we cannot take a branch before invalidating the
BTB.

We only apply this to A12 and A17, which are the only two ARM
cores on which this useful.

Signed-off-by: default avatarMarc Zyngier <marc.zyngier@arm.com>
Signed-off-by: default avatarRussell King <rmk+kernel@armlinux.org.uk>
Boot-tested-by: default avatarTony Lindgren <tony@atomide.com>
Reviewed-by: default avatarTony Lindgren <tony@atomide.com>
parent c44f366e
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