Re: [PATCH v7 01/14] mm: Add F_SEAL_AUTO_ALLOCATE seal to memfd

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Subject: Re: [PATCH v7 01/14] mm: Add F_SEAL_AUTO_ALLOCATE seal to memfd
From: Paolo Bonzini <pbonzini@xxxxxxxxxx>
Date: Thu, 18 Aug 2022 11:09:52 +0200
Cc: David Hildenbrand <david@xxxxxxxxxx>, Chao Peng <chao.p.peng@xxxxxxxxxxxxxxx>, kvm@xxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, linux-mm@xxxxxxxxx, linux-fsdevel@xxxxxxxxxxxxxxx, linux-api@xxxxxxxxxxxxxxx, linux-doc@xxxxxxxxxxxxxxx, qemu-devel@xxxxxxxxxx, linux-kselftest@xxxxxxxxxxxxxxx, Jonathan Corbet <corbet@xxxxxxx>, Sean Christopherson <seanjc@xxxxxxxxxx>, Vitaly Kuznetsov <vkuznets@xxxxxxxxxx>, Wanpeng Li <wanpengli@xxxxxxxxxxx>, Jim Mattson <jmattson@xxxxxxxxxx>, Joerg Roedel <joro@xxxxxxxxxx>, Thomas Gleixner <tglx@xxxxxxxxxxxxx>, Ingo Molnar <mingo@xxxxxxxxxx>, Borislav Petkov <bp@xxxxxxxxx>, x86@xxxxxxxxxx, "H . Peter Anvin" <hpa@xxxxxxxxx>, Hugh Dickins <hughd@xxxxxxxxxx>, Jeff Layton <jlayton@xxxxxxxxxx>, "J . Bruce Fields" <bfields@xxxxxxxxxxxx>, Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>, Shuah Khan <shuah@xxxxxxxxxx>, Mike Rapoport <rppt@xxxxxxxxxx>, Steven Price <steven.price@xxxxxxx>, "Maciej S . Szmigiero" <mail@xxxxxxxxxxxxxxxxxxxxx>, Vlastimil Babka <vbabka@xxxxxxx>, Vishal Annapurve <vannapurve@xxxxxxxxxx>, Yu Zhang <yu.c.zhang@xxxxxxxxxxxxxxx>, "Kirill A . Shutemov" <kirill.shutemov@xxxxxxxxxxxxxxx>, luto@xxxxxxxxxx, jun.nakajima@xxxxxxxxx, dave.hansen@xxxxxxxxx, ak@xxxxxxxxxxxxxxx, aarcange@xxxxxxxxxx, ddutile@xxxxxxxxxx, dhildenb@xxxxxxxxxx, Quentin Perret <qperret@xxxxxxxxxx>, Michael Roth <michael.roth@xxxxxxx>, mhocko@xxxxxxxx, Muchun Song <songmuchun@xxxxxxxxxxxxx>
In-reply-to: <20220817234120.mw2j3cgshmuyo2vw@box.shutemov.name>
References: <20220706082016.2603916-1-chao.p.peng@linux.intel.com> <20220706082016.2603916-2-chao.p.peng@linux.intel.com> <f39c4f63-a511-4beb-b3a4-66589ddb5475@redhat.com> <472207cf-ff71-563b-7b66-0c7bea9ea8ad@redhat.com> <20220817234120.mw2j3cgshmuyo2vw@box.shutemov.name>
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Thunderbird/91.12.0

On 8/18/22 01:41, Kirill A. Shutemov wrote:

Note, that userfaultfd is only relevant for shared memory as it requires
VMA which we don't have for MFD_INACCESSIBLE.


Oh, you're right!  So yeah, looks like userfaultfd is not a problem.

Paolo

References:
- [PATCH v7 00/14] KVM: mm: fd-based approach for supporting KVM guest private memory
  - From: Chao Peng
- [PATCH v7 01/14] mm: Add F_SEAL_AUTO_ALLOCATE seal to memfd
  - From: Chao Peng
- Re: [PATCH v7 01/14] mm: Add F_SEAL_AUTO_ALLOCATE seal to memfd
  - From: David Hildenbrand
- Re: [PATCH v7 01/14] mm: Add F_SEAL_AUTO_ALLOCATE seal to memfd
  - From: Paolo Bonzini
- Re: [PATCH v7 01/14] mm: Add F_SEAL_AUTO_ALLOCATE seal to memfd
  - From: Kirill A. Shutemov

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