linux-kernel - Re: [RFC v2 PATCH 01/13] mm/shmem: Introduce F_SEAL

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Message-ID: <YZf4aAlbyeWw8wUk@google.com>
Date:   Fri, 19 Nov 2021 19:18:00 +0000
From:   Sean Christopherson <seanjc@...gle.com>
To:     David Hildenbrand <david@...hat.com>
Cc:     Jason Gunthorpe <jgg@...pe.ca>,
        Chao Peng <chao.p.peng@...ux.intel.com>, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        linux-fsdevel@...r.kernel.org, qemu-devel@...gnu.org,
        Paolo Bonzini <pbonzini@...hat.com>,
        Jonathan Corbet <corbet@....net>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Joerg Roedel <joro@...tes.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        x86@...nel.org, "H . Peter Anvin" <hpa@...or.com>,
        Hugh Dickins <hughd@...gle.com>,
        Jeff Layton <jlayton@...nel.org>,
        "J . Bruce Fields" <bfields@...ldses.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Yu Zhang <yu.c.zhang@...ux.intel.com>,
        "Kirill A . Shutemov" <kirill.shutemov@...ux.intel.com>,
        luto@...nel.org, john.ji@...el.com, susie.li@...el.com,
        jun.nakajima@...el.com, dave.hansen@...el.com, ak@...ux.intel.com
Subject: Re: [RFC v2 PATCH 01/13] mm/shmem: Introduce F_SEAL_GUEST

On Fri, Nov 19, 2021, David Hildenbrand wrote:
> On 19.11.21 16:19, Jason Gunthorpe wrote:
> > As designed the above looks useful to import a memfd to a VFIO
> > container but could you consider some more generic naming than calling
> > this 'guest' ?
> 
> +1 the guest terminology is somewhat sob-optimal.

For the F_SEAL part, maybe F_SEAL_UNMAPPABLE?

No ideas for the kernel API, but that's also less concerning since it's not set
in stone.  I'm also not sure that dedicated APIs for each high-ish level use case
would be a bad thing, as the semantics are unlikely to be different to some extent.
E.g. for the KVM use case, there can be at most one guest associated with the fd,
but there can be any number of VFIO devices attached to the fd.