KVM: arm64: Wrap the host with a stage 2
When KVM runs in protected nVHE mode, make use of a stage 2 page-table to give the hypervisor some control over the host memory accesses. The host stage 2 is created lazily using large block mappings if possible, and will default to page mappings in absence of a better solution. >From this point on, memory accesses from the host to protected memory regions (e.g. not 'owned' by the host) are fatal and lead to hyp_panic(). Acked-by: Will Deacon <will@kernel.org> Signed-off-by: Quentin Perret <qperret@google.com> Signed-off-by: Marc Zyngier <maz@kernel.org> Link: https://lore.kernel.org/r/20210319100146.1149909-36-qperret@google.com
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