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The PSCI specification defines only a 32-bit function ID for the MEM_PROTECT call used to protect against cold reboot attacks. Fix the pKVM hypervisor invocation of MEM_PROTECT to use the 32-bit function ID instead of the unallocated 64-bit flavour. Bug: 260316363 Signed-off-by: Will Deacon <willdeacon@google.com> Change-Id: I675a57419064f7f006960ca5370e9dc2d5279a90