Re: [PATCH] KVM: arm64: Count pKVM stage-2 usage in secondary pagetable stats

[Oliver Upton <oliver.upton@linux.dev>]

On Fri, Feb 28, 2025 at 12:13:55PM +0000, Vincent Donnefort wrote:
> Count the pages used by pKVM for the guest stage-2 in memory stats under
> secondary pagetable stats, similarly to what the VHE mode does.
> 
> Signed-off-by: Vincent Donnefort <vdonnefort@google.com>
> 
> diff --git a/arch/arm64/kvm/mmu.c b/arch/arm64/kvm/mmu.c
> index 1f55b0c7b11d..c2e022c41313 100644
> --- a/arch/arm64/kvm/mmu.c
> +++ b/arch/arm64/kvm/mmu.c
> @@ -1088,12 +1088,18 @@ void kvm_free_stage2_pgd(struct kvm_s2_mmu *mmu)
>  
>  static void hyp_mc_free_fn(void *addr, void *unused)
>  {
> +	kvm_account_pgtable_pages(addr, -1);
>  	free_page((unsigned long)addr);
>  }

Don't we drain more than just stage-2 page tables into the teardown_mc
(e.g. vcpu structs)?

Thanks,
Oliver