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Shutemov" Subject: Re: [PATCH v3 3/6] mm: introduce memfd_secret system call to create "secret" memory areas Message-ID: <20200806111415.GL163101@linux.ibm.com> References: <20200804095035.18778-1-rppt@kernel.org> <20200804095035.18778-4-rppt@kernel.org> <20200806102757.7vobcaewdukr2xdl@box> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20200806102757.7vobcaewdukr2xdl@box> X-TM-AS-GCONF: 00 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.235,18.0.687 definitions=2020-08-06_06:2020-08-06,2020-08-06 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 mlxscore=0 adultscore=0 mlxlogscore=923 lowpriorityscore=0 suspectscore=1 bulkscore=0 clxscore=1015 spamscore=0 priorityscore=1501 impostorscore=0 phishscore=0 malwarescore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2006250000 definitions=main-2008060079 Message-ID-Hash: IOQ2V4V26PPH6RKEHOSOMY4R5J2DPFCT X-Message-ID-Hash: IOQ2V4V26PPH6RKEHOSOMY4R5J2DPFCT X-MailFrom: rppt@linux.ibm.com X-Mailman-Rule-Hits: nonmember-moderation X-Mailman-Rule-Misses: dmarc-mitigation; no-senders; approved; emergency; loop; banned-address; member-moderation CC: Mike Rapoport , linux-kernel@vger.kernel.org, Alexander Viro , Andrew Morton , Andy Lutomirski , Arnd Bergmann , Borislav Petkov , Catalin Marinas , Christopher Lameter , Dave Hansen , Elena Reshetova , "H. Peter Anvin" , Idan Yaniv , Ingo Molnar , James Bottomley , Matthew Wilcox , Mark Rutland , Michael Kerrisk , Palmer Dabbelt , Paul Walmsley , Peter Zijlstra , Thomas Gleixner , Tycho Andersen , Will Deacon , linux-api@vger.kernel.org, linux-arch@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-fsdevel@ vger.kernel.org, linux-mm@kvack.org, linux-nvdimm@lists.01.org, linux-riscv@lists.infradead.org, x86@kernel.org X-Mailman-Version: 3.1.1 Precedence: list List-Id: "Linux-nvdimm developer list." Archived-At: List-Archive: List-Help: List-Post: List-Subscribe: List-Unsubscribe: Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit On Thu, Aug 06, 2020 at 01:27:57PM +0300, Kirill A. Shutemov wrote: > On Tue, Aug 04, 2020 at 12:50:32PM +0300, Mike Rapoport wrote: > > From: Mike Rapoport > > > > Introduce "memfd_secret" system call with the ability to create memory > > areas visible only in the context of the owning process and not mapped not > > only to other processes but in the kernel page tables as well. > > > > The user will create a file descriptor using the memfd_secret() system call > > where flags supplied as a parameter to this system call will define the > > desired protection mode for the memory associated with that file > > descriptor. Currently there are two protection modes: > > > > * exclusive - the memory area is unmapped from the kernel direct map and it > > is present only in the page tables of the owning mm. > > * uncached - the memory area is present only in the page tables of the > > owning mm and it is mapped there as uncached. > > I'm not sure why flag for exclusive mode is needed. It has to be default. > And if you want uncached on top of that set the flag. Makes sense. > What am I missing? > > -- > Kirill A. Shutemov -- Sincerely yours, Mike. _______________________________________________ Linux-nvdimm mailing list -- linux-nvdimm@lists.01.org To unsubscribe send an email to linux-nvdimm-leave@lists.01.org