linux-kernel - RE: [PATCH v8 1/8] mm/memfd: Introduce userspace inaccessible memfd

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Date:   Thu, 22 Sep 2022 13:26:47 +0000
From:   "Wang, Wei W" <wei.w.wang@...el.com>
To:     Chao Peng <chao.p.peng@...ux.intel.com>,
        "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>,
        "linux-api@...r.kernel.org" <linux-api@...r.kernel.org>,
        "linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
        "qemu-devel@...gnu.org" <qemu-devel@...gnu.org>
CC:     Paolo Bonzini <pbonzini@...hat.com>,
        Jonathan Corbet <corbet@....net>,
        "Christopherson,, Sean" <seanjc@...gle.com>,
        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" <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>,
        Shuah Khan <shuah@...nel.org>,
        "Mike Rapoport" <rppt@...nel.org>,
        Steven Price <steven.price@....com>,
        "Maciej S . Szmigiero" <mail@...iej.szmigiero.name>,
        Vlastimil Babka <vbabka@...e.cz>,
        Vishal Annapurve <vannapurve@...gle.com>,
        Yu Zhang <yu.c.zhang@...ux.intel.com>,
        "Kirill A . Shutemov" <kirill.shutemov@...ux.intel.com>,
        "Lutomirski, Andy" <luto@...nel.org>,
        "Nakajima, Jun" <jun.nakajima@...el.com>,
        "Hansen, Dave" <dave.hansen@...el.com>,
        "ak@...ux.intel.com" <ak@...ux.intel.com>,
        "david@...hat.com" <david@...hat.com>,
        "aarcange@...hat.com" <aarcange@...hat.com>,
        "ddutile@...hat.com" <ddutile@...hat.com>,
        "dhildenb@...hat.com" <dhildenb@...hat.com>,
        Quentin Perret <qperret@...gle.com>,
        Michael Roth <michael.roth@....com>,
        "Hocko, Michal" <mhocko@...e.com>,
        Muchun Song <songmuchun@...edance.com>
Subject: RE: [PATCH v8 1/8] mm/memfd: Introduce userspace inaccessible memfd

On Thursday, September 15, 2022 10:29 PM, Chao Peng wrote:
> +int inaccessible_get_pfn(struct file *file, pgoff_t offset, pfn_t *pfn,
> +			 int *order)

Better to remove "order" from this interface?
Some callers only need to get pfn, and no need to bother with
defining and inputting something unused. For callers who need the "order",
can easily get it via thp_order(pfn_to_page(pfn)) on their own.