KVM: Implement kvm_put_guest()
kvm_put_guest() is analogous to put_user() - it writes a single value to the guest physical address. The implementation is built upon put_user() and so it has the same single copy atomic properties. Signed-off-by: Steven Price <steven.price@arm.com> Signed-off-by: Marc Zyngier <maz@kernel.org>
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