Re: [PATCH v3 4/5] KVM: selftests: Move page_align() to shared header

[Sean Christopherson <seanjc@google.com>]

On Tue, Jan 06, 2026, Fuad Tabba wrote:
> To avoid code duplication, move page_align() to the shared `kvm_util.h`
> header file.
> 
> No functional change intended.
> 
> Reviewed-by: Andrew Jones <andrew.jones@linux.dev>
> Signed-off-by: Fuad Tabba <tabba@google.com>
> ---
>  tools/testing/selftests/kvm/include/kvm_util.h    | 5 +++++
>  tools/testing/selftests/kvm/lib/arm64/processor.c | 5 -----
>  tools/testing/selftests/kvm/lib/riscv/processor.c | 5 -----
>  3 files changed, 5 insertions(+), 10 deletions(-)
> 
> diff --git a/tools/testing/selftests/kvm/include/kvm_util.h b/tools/testing/selftests/kvm/include/kvm_util.h
> index 81f4355ff28a..dabbe4c3b93f 100644
> --- a/tools/testing/selftests/kvm/include/kvm_util.h
> +++ b/tools/testing/selftests/kvm/include/kvm_util.h
> @@ -1258,6 +1258,11 @@ static inline int __vm_disable_nx_huge_pages(struct kvm_vm *vm)
>  	return __vm_enable_cap(vm, KVM_CAP_VM_DISABLE_NX_HUGE_PAGES, 0);
>  }
>  
> +static inline uint64_t page_align(struct kvm_vm *vm, uint64_t v)

Maybe vm_page_align()?  So that it's a bit more obvious when reading call sites
that the alignment is done with respect to the guest's "base" page size, not the
host's page size.

> +{
> +	return (v + vm->page_size - 1) & ~(vm->page_size - 1);
> +}
> +
>  /*
>   * Arch hook that is invoked via a constructor, i.e. before exeucting main(),
>   * to allow for arch-specific setup that is common to all tests, e.g. computing
> diff --git a/tools/testing/selftests/kvm/lib/arm64/processor.c b/tools/testing/selftests/kvm/lib/arm64/processor.c
> index 607a4e462984..143632917766 100644
> --- a/tools/testing/selftests/kvm/lib/arm64/processor.c
> +++ b/tools/testing/selftests/kvm/lib/arm64/processor.c
> @@ -21,11 +21,6 @@
>  
>  static vm_vaddr_t exception_handlers;
>  
> -static uint64_t page_align(struct kvm_vm *vm, uint64_t v)
> -{
> -	return (v + vm->page_size - 1) & ~(vm->page_size - 1);
> -}
> -
>  static uint64_t pgd_index(struct kvm_vm *vm, vm_vaddr_t gva)
>  {
>  	unsigned int shift = (vm->pgtable_levels - 1) * (vm->page_shift - 3) + vm->page_shift;
> diff --git a/tools/testing/selftests/kvm/lib/riscv/processor.c b/tools/testing/selftests/kvm/lib/riscv/processor.c
> index d5e8747b5e69..f8ff4bf938d9 100644
> --- a/tools/testing/selftests/kvm/lib/riscv/processor.c
> +++ b/tools/testing/selftests/kvm/lib/riscv/processor.c
> @@ -26,11 +26,6 @@ bool __vcpu_has_ext(struct kvm_vcpu *vcpu, uint64_t ext)
>  	return !ret && !!value;
>  }
>  
> -static uint64_t page_align(struct kvm_vm *vm, uint64_t v)
> -{
> -	return (v + vm->page_size - 1) & ~(vm->page_size - 1);
> -}
> -
>  static uint64_t pte_addr(struct kvm_vm *vm, uint64_t entry)
>  {
>  	return ((entry & PGTBL_PTE_ADDR_MASK) >> PGTBL_PTE_ADDR_SHIFT) <<
> -- 
> 2.52.0.351.gbe84eed79e-goog
> 

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