KVM: arm64: Simplify the sanitise_mte_tags() logic

Currently sanitise_mte_tags() checks if it's an online page before
attempting to sanitise the tags. Such detection should be done in the
caller via the VM_MTE_ALLOWED vma flag. Since kvm_set_spte_gfn() does
not have the vma, leave the page unmapped if not already tagged. Tag
initialisation will be done on a subsequent access fault in
user_mem_abort().

Signed-off-by: Catalin Marinas <[email protected]>
[[email protected]: fix the page initializer]
Signed-off-by: Peter Collingbourne <[email protected]>
Reviewed-by: Steven Price <[email protected]>
Cc: Will Deacon <[email protected]>
Cc: Marc Zyngier <[email protected]>
Cc: Peter Collingbourne <[email protected]>
Reviewed-by: Cornelia Huck <[email protected]>
Signed-off-by: Marc Zyngier <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

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