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[142.162.113.129]) by smtp.gmail.com with ESMTPSA id x21sm6354233qkf.77.2021.11.23.09.17.23 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 23 Nov 2021 09:17:23 -0800 (PST) Received: from jgg by mlx with local (Exim 4.94) (envelope-from ) id 1mpZQ3-000Dij-2a; Tue, 23 Nov 2021 13:17:23 -0400 Date: Tue, 23 Nov 2021 13:17:23 -0400 From: Jason Gunthorpe To: Paolo Bonzini Subject: Re: [RFC v2 PATCH 01/13] mm/shmem: Introduce F_SEAL_GUEST Message-ID: <20211123171723.GD5112@ziepe.ca> References: <20211119134739.20218-1-chao.p.peng@linux.intel.com> <20211119134739.20218-2-chao.p.peng@linux.intel.com> <20211119151943.GH876299@ziepe.ca> <6de78894-8269-ea3a-b4ee-a5cc4dad827e@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <6de78894-8269-ea3a-b4ee-a5cc4dad827e@redhat.com> X-Host-Lookup-Failed: Reverse DNS lookup failed for 2607:f8b0:4864:20::f2a (failed) Received-SPF: pass client-ip=2607:f8b0:4864:20::f2a; envelope-from=jgg@ziepe.ca; helo=mail-qv1-xf2a.google.com X-Spam_score_int: -12 X-Spam_score: -1.3 X-Spam_bar: - X-Spam_report: (-1.3 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, PDS_HP_HELO_NORDNS=0.001, RCVD_IN_DNSWL_NONE=-0.0001, RDNS_NONE=0.793, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=no autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Wanpeng Li , jun.nakajima@intel.com, kvm@vger.kernel.org, David Hildenbrand , qemu-devel@nongnu.org, "J . Bruce Fields" , linux-mm@kvack.org, "H . Peter Anvin" , Chao Peng , ak@linux.intel.com, Jonathan Corbet , Joerg Roedel , x86@kernel.org, Hugh Dickins , Ingo Molnar , Borislav Petkov , luto@kernel.org, Thomas Gleixner , Vitaly Kuznetsov , Jim Mattson , dave.hansen@intel.com, Sean Christopherson , susie.li@intel.com, Jeff Layton , linux-kernel@vger.kernel.org, john.ji@intel.com, Yu Zhang , linux-fsdevel@vger.kernel.org, Andrew Morton , "Kirill A . Shutemov" Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On Tue, Nov 23, 2021 at 10:06:02AM +0100, Paolo Bonzini wrote: > I think it's great that memfd hooks are usable by more than one subsystem, > OTOH it's fair that whoever needs it does the work---and VFIO does not need > it for confidential VMs, yet, so it should be fine for now to have a single > user. I think adding a new interface to a core kernel subsystem should come with a greater requirement to work out something generally useful and not be overly wedded to a single use case (eg F_SEAL_GUEST) Especially if something like 'single user' is not just a small implementation artifact but a key design tennant of the whole eventual solution. Jason