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Peter Anvin" , Thomas Gleixner , Ingo Molnar , linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, linux-mm@kvack.org, linux-arch@vger.kernel.org, linux-api@vger.kernel.org, Arnd Bergmann , Andy Lutomirski , Balbir Singh , Cyrill Gorcunov , Dave Hansen , Eugene Syromiatnikov , Florian Weimer , "H . J . Lu" , Jann Horn , Jonathan Corbet , Kees Cook , Mike Kravetz , Nadav Amit , Oleg Nesterov , Pavel Machek , Peter Zijlstra , Randy Dunlap , Weijiang Yang , "Kirill A . Shutemov" , John Allen , kcc@google.com, eranian@google.com, rppt@kernel.org, jamorris@linux.microsoft.com, dethoma@microsoft.com, akpm@linux-foundation.org, Andrew.Cooper3@citrix.com, christina.schimpe@intel.com, david@redhat.com, debug@rivosinc.com, Yu-cheng Yu Subject: Re: [PATCH v7 22/41] mm/mmap: Add shadow stack pages to memory accounting Message-ID: References: <20230227222957.24501-1-rick.p.edgecombe@intel.com> <20230227222957.24501-23-rick.p.edgecombe@intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <20230227222957.24501-23-rick.p.edgecombe@intel.com> X-Stat-Signature: bfsitmfbck4tmbn89zu9dmuo8pz9o33m X-Rspam-User: X-Rspamd-Queue-Id: E57F5140015 X-Rspamd-Server: rspam06 X-HE-Tag: 1678107669-487429 X-HE-Meta: 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 sKJpXk/A 35cIMQUYSqZnAQ6QFs8M+rJoEZ/eB3fo66vCRuzoLU+TMMPH17zIfY/LQpDcSMnEkj7D2ErULlhQrmwhxIqsKi3j8cfoF4t8XT/lKQzYEsvicSwz2Sf89f7ufia1CimaX9u5V/ZYFJT+GZ1kAKxO4df6uEB/ueKwn701y3sXuseF9WTvATObqJpZ8sa2LEU/br4glVMBwYq9qf9K3ooTsyJI3/alo8NLZyAIYi6/PTdgeslrVTFR2L6ib98i48BWO6E7aOLpQQQbLT0sPaJOCRku1k9Go9Ynt5gBubupVtDZhxksJvGZ2MzSMiA== 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: On Mon, Feb 27, 2023 at 02:29:38PM -0800, Rick Edgecombe wrote: > From: Yu-cheng Yu > > The x86 Control-flow Enforcement Technology (CET) feature includes a new > type of memory called shadow stack. This shadow stack memory has some > unusual properties, which requires some core mm changes to function > properly. > > Account shadow stack pages to stack memory. Do this by adding a > VM_SHADOW_STACK check in is_stack_mapping(). That last sentence is superfluous. -- Regards/Gruss, Boris. https://people.kernel.org/tglx/notes-about-netiquette