linux-kernel - Re: [PATCH 03/15] KVM: selftests: Align HVA for HugeTLB-backed memslots

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Date:   Wed, 10 Feb 2021 16:52:38 -0800
From:   Ben Gardon <bgardon@...gle.com>
To:     Sean Christopherson <seanjc@...gle.com>
Cc:     Paolo Bonzini <pbonzini@...hat.com>, kvm <kvm@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Yanan Wang <wangyanan55@...wei.com>,
        Andrew Jones <drjones@...hat.com>,
        Peter Xu <peterx@...hat.com>,
        Aaron Lewis <aaronlewis@...gle.com>
Subject: Re: [PATCH 03/15] KVM: selftests: Align HVA for HugeTLB-backed memslots

On Wed, Feb 10, 2021 at 3:06 PM Sean Christopherson <seanjc@...gle.com> wrote:
>
> Align the HVA for HugeTLB memslots, not just THP memslots.  Add an
> assert so any future backing types are forced to assess whether or not
> they need to be aligned.
>
> Cc: Ben Gardon <bgardon@...gle.com>
> Cc: Yanan Wang <wangyanan55@...wei.com>
> Cc: Andrew Jones <drjones@...hat.com>
> Cc: Peter Xu <peterx@...hat.com>
> Cc: Aaron Lewis <aaronlewis@...gle.com>
> Signed-off-by: Sean Christopherson <seanjc@...gle.com>

Reviewed-by: Ben Gardon <bgardon@...gle.com>

> ---
>  tools/testing/selftests/kvm/lib/kvm_util.c | 5 ++++-
>  1 file changed, 4 insertions(+), 1 deletion(-)
>
> diff --git a/tools/testing/selftests/kvm/lib/kvm_util.c b/tools/testing/selftests/kvm/lib/kvm_util.c
> index 584167c6dbc7..deaeb47b5a6d 100644
> --- a/tools/testing/selftests/kvm/lib/kvm_util.c
> +++ b/tools/testing/selftests/kvm/lib/kvm_util.c
> @@ -731,8 +731,11 @@ void vm_userspace_mem_region_add(struct kvm_vm *vm,
>         alignment = 1;
>  #endif
>
> -       if (src_type == VM_MEM_SRC_ANONYMOUS_THP)
> +       if (src_type == VM_MEM_SRC_ANONYMOUS_THP ||
> +           src_type == VM_MEM_SRC_ANONYMOUS_HUGETLB)
>                 alignment = max(huge_page_size, alignment);
> +       else
> +               ASSERT_EQ(src_type, VM_MEM_SRC_ANONYMOUS);
>
>         /* Add enough memory to align up if necessary */
>         if (alignment > 1)
> --
> 2.30.0.478.g8a0d178c01-goog
>