Count the pages used by KVM in arm64 for stage2 mmu in memory stats
under secondary pagetable stats (e.g. "SecPageTables" in /proc/meminfo)
to give better visibility into the memory consumption of KVM mmu in a
similar way to how normal user page tables are accounted.

Signed-off-by: Yosry Ahmed <redacted>
Reviewed-by: Oliver Upton <redacted>
Reviewed-by: Marc Zyngier <maz@kernel.org>
---

I see that you are not including the memory reserved for the host stage2 
table when using protected KVM. Is this something worth adding? (See 
arch/arm64/kvm/pkvm.c:kvm_hyp_reserve()).

This reservation is done pretty early on in bootmem_init() so not sure 
if this could cause some init ordering issues that might be tricky to 
solve though.

Thanks,
Ryan



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