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Thu, 13 Apr 2023 15:53:24 -0700 (PDT) Date: Thu, 13 Apr 2023 22:53:22 +0000 In-Reply-To: <20230412-kurzweilig-unsummen-3c1136f7f437@brauner> (message from Christian Brauner on Wed, 12 Apr 2023 11:59:52 +0200) Mime-Version: 1.0 Message-ID: Subject: Re: [RFC PATCH v3 1/2] mm: restrictedmem: Allow userspace to specify mount for memfd_restricted From: Ackerley Tng To: Christian Brauner Cc: kvm@vger.kernel.org, linux-api@vger.kernel.org, linux-arch@vger.kernel.org, linux-doc@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, qemu-devel@nongnu.org, aarcange@redhat.com, ak@linux.intel.com, akpm@linux-foundation.org, arnd@arndb.de, bfields@fieldses.org, bp@alien8.de, chao.p.peng@linux.intel.com, corbet@lwn.net, dave.hansen@intel.com, david@redhat.com, ddutile@redhat.com, dhildenb@redhat.com, hpa@zytor.com, hughd@google.com, jlayton@kernel.org, jmattson@google.com, joro@8bytes.org, jun.nakajima@intel.com, kirill.shutemov@linux.intel.com, linmiaohe@huawei.com, luto@kernel.org, mail@maciej.szmigiero.name, mhocko@suse.com, michael.roth@amd.com, mingo@redhat.com, naoya.horiguchi@nec.com, pbonzini@redhat.com, qperret@google.com, rppt@kernel.org, seanjc@google.com, shuah@kernel.org, steven.price@arm.com, tabba@google.com, tglx@linutronix.de, vannapurve@google.com, vbabka@suse.cz, vkuznets@redhat.com, wanpengli@tencent.com, wei.w.wang@intel.com, x86@kernel.org, yu.c.zhang@linux.intel.com Content-Type: text/plain; charset="UTF-8"; format=flowed; delsp=yes X-Stat-Signature: qzj5xgry4ckhyoz8zj3sejift67f7mq9 X-Rspam-User: X-Rspamd-Queue-Id: 82AC9C0017 X-Rspamd-Server: rspam06 X-HE-Tag: 1681426405-311049 X-HE-Meta: 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 oIs2qjBA 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: Christian Brauner writes: > On Wed, Apr 05, 2023 at 09:58:44PM +0000, Ackerley Tng wrote: >> ... >> > > Why do you even need this flag? It seems that @mount_fd being < 0 is >> > > sufficient to indicate that a new restricted memory fd is supposed >> to be >> > > created in the system instance. >> I'm hoping to have this patch series merged after Chao's patch series >> introduces the memfd_restricted() syscall [1]. > I'm curious, is there an LSFMM session for this? As far as I know, there is no LSFMM session for this.