[PATCH v2 01/18] KVM: arm64: Add __pkvm_private_range_pa

[Fuad Tabba]

On Mon, 6 Jul 2026 at 18:54, Vincent Donnefort <vdonnefort at google.com> wrote:
>
> Mappings in the pKVM private range are not identity mapped, making the
> standard __hyp_pa() unsuitable for translating these addresses.
>
> Introduce __pkvm_private_range_pa() to resolve physical addresses for
> this range by walking the hypervisor page-table. This will be useful for
> the upcoming pKVM heap allocator.
>
> Signed-off-by: Vincent Donnefort <vdonnefort at google.com>
>
> diff --git a/arch/arm64/kvm/hyp/include/nvhe/mm.h b/arch/arm64/kvm/hyp/include/nvhe/mm.h
> index 6e83ce35c2f2..d3137c16b632 100644
> --- a/arch/arm64/kvm/hyp/include/nvhe/mm.h
> +++ b/arch/arm64/kvm/hyp/include/nvhe/mm.h
> @@ -30,5 +30,6 @@ int __pkvm_create_private_mapping(phys_addr_t phys, size_t size,
>                                   unsigned long *haddr);
>  int pkvm_create_stack(phys_addr_t phys, unsigned long *haddr);
>  int pkvm_alloc_private_va_range(size_t size, unsigned long *haddr);
> +phys_addr_t __pkvm_private_range_pa(void *va);
>
>  #endif /* __KVM_HYP_MM_H */
> diff --git a/arch/arm64/kvm/hyp/nvhe/mm.c b/arch/arm64/kvm/hyp/nvhe/mm.c
> index 3b0bee496bff..773426a68d2d 100644
> --- a/arch/arm64/kvm/hyp/nvhe/mm.c
> +++ b/arch/arm64/kvm/hyp/nvhe/mm.c
> @@ -502,3 +502,17 @@ int refill_memcache(struct kvm_hyp_memcache *mc, unsigned long min_pages,
>
>         return ret;
>  }
> +
> +phys_addr_t __pkvm_private_range_pa(void *va)
> +{
> +       kvm_pte_t pte = 0;
> +       s8 level;
> +
> +       hyp_spin_lock(&pkvm_pgd_lock);
> +       WARN_ON(kvm_pgtable_get_leaf(&pkvm_pgtable, (u64)va, &pte, &level));

nit: can you pass NULL instead of level?

Reviewed-by: Fuad Tabba <fuad.tabba at linux.dev>

Cheers,
/fuad


> +       hyp_spin_unlock(&pkvm_pgd_lock);
> +
> +       WARN_ON(!kvm_pte_valid(pte));
> +
> +       return kvm_pte_to_phys(pte) + offset_in_page(va);
> +}
> --
> 2.55.0.rc2.803.g1fd1e6609c-goog
>