KVM: arm/arm64: VGIC/ITS save/restore: protect kvm_read_guest() calls

kvm_read_guest() will eventually look up in kvm_memslots(), which requires
either to hold the kvm->slots_lock or to be inside a kvm->srcu critical
section.
In contrast to x86 and s390 we don't take the SRCU lock on every guest
exit, so we have to do it individually for each kvm_read_guest() call.
Use the newly introduced wrapper for that.

Cc: Stable <[email protected]> # 4.12+
Reported-by: Jan Glauber <[email protected]>
Signed-off-by: Andre Przywara <[email protected]>
Acked-by: Christoffer Dall <[email protected]>
Signed-off-by: Paolo Bonzini <[email protected]>

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