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(p200300cbc7024100a0641ded25eccf2f.dip0.t-ipconnect.de. [2003:cb:c702:4100:a064:1ded:25ec:cf2f]) by smtp.gmail.com with ESMTPSA id v7-20020a5d4b07000000b002c56af32e8csm8555317wrq.35.2023.03.20.03.55.27 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 20 Mar 2023 03:55:29 -0700 (PDT) Message-ID: Date: Mon, 20 Mar 2023 11:55:27 +0100 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.8.0 Subject: Re: [PATCH v8 17/40] mm: Move VM_UFFD_MINOR_BIT from 37 to 38 To: Rick Edgecombe , x86@kernel.org, "H . 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 , Borislav Petkov , 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, debug@rivosinc.com, szabolcs.nagy@arm.com Cc: Yu-cheng Yu References: <20230319001535.23210-1-rick.p.edgecombe@intel.com> <20230319001535.23210-18-rick.p.edgecombe@intel.com> From: David Hildenbrand Organization: Red Hat In-Reply-To: <20230319001535.23210-18-rick.p.edgecombe@intel.com> X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Language: en-US Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Rspamd-Queue-Id: 6D4D01C000F X-Stat-Signature: f6ih5cq6f19zfpforruicuc7of13ksr5 X-Rspam-User: X-Rspamd-Server: rspam08 X-HE-Tag: 1679309735-159856 X-HE-Meta: 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 oRLlzHvv 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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: On 19.03.23 01:15, 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. > > Future patches will introduce a new VM flag VM_SHADOW_STACK that will be > VM_HIGH_ARCH_BIT_5. VM_HIGH_ARCH_BIT_1 through VM_HIGH_ARCH_BIT_4 are > bits 32-36, and bit 37 is the unrelated VM_UFFD_MINOR_BIT. For the sake > of order, make all VM_HIGH_ARCH_BITs stay together by moving > VM_UFFD_MINOR_BIT from 37 to 38. This will allow VM_SHADOW_STACK to be > introduced as 37. > > Co-developed-by: Rick Edgecombe > Signed-off-by: Yu-cheng Yu > Signed-off-by: Rick Edgecombe > Reviewed-by: Kees Cook > Reviewed-by: Axel Rasmussen > Acked-by: Mike Rapoport (IBM) > Acked-by: Peter Xu > Tested-by: Pengfei Xu > Tested-by: John Allen > Tested-by: Kees Cook > --- Reviewed-by: David Hildenbrand -- Thanks, David / dhildenb