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46dc542870
Exposing set/way cache maintenance to a virtual machine is unsafe, not least because the instructions are not permission-checked but also because they are not broadcast between CPUs. Consequently, KVM traps and emulates such maintenance in the host kernel using by-VA operations and looping over the stage-2 page-tables. However, when running under protected KVM, these instructions are not able to be emulated and will instead result in an exception being delivered to the guest. Introduce CONFIG_CMO_BY_VA_ONLY so that virtual platforms can select this option and perform by-VA cache maintenance instead of using the set/way instructions. Signed-off-by: Marc Zyngier <maz@kernel.org> Signed-off-by: Will Deacon <willdeacon@google.com> Signed-off-by: Pierre-Clément Tosi <ptosi@google.com> [ Paul: pick from the Android tree. Fixup Pierre's commit. And fix some checkpatch warnings. Rebased to upstream. ] Signed-off-by: Ying-Chun Liu (PaulLiu) <paul.liu@linaro.org> Cc: Tom Rini <trini@konsulko.com> Link: |
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