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

[Fuad Tabba]

On Tue, 6 Jan 2026 at 19:46, Sean Christopherson <seanjc at google.com> wrote:
>
> 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 at linux.dev>
> > Signed-off-by: Fuad Tabba <tabba at 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.

Yes, that's clearer. I'll fix this.

Thanks,
/fuad

> > +{
> > +     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
> >