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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 , 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, david@redhat.com, debug@rivosinc.com Cc: rick.p.edgecombe@intel.com, Yu-cheng Yu , Peter Xu Subject: [PATCH v7 17/41] mm: Move VM_UFFD_MINOR_BIT from 37 to 38 Date: Mon, 27 Feb 2023 14:29:33 -0800 Message-Id: <20230227222957.24501-18-rick.p.edgecombe@intel.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20230227222957.24501-1-rick.p.edgecombe@intel.com> References: <20230227222957.24501-1-rick.p.edgecombe@intel.com> X-Rspamd-Server: rspam05 X-Rspamd-Queue-Id: 14789C0010 X-Stat-Signature: i7omett9ayu1txuje6z3jmp31j947pdu X-Rspam-User: X-HE-Tag: 1677537104-258285 X-HE-Meta: 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 CJ2xuHLT CDWqWIZAU64GYi9R8oVQ8t5kLsKUKOcdrJQnXCCxqvlDlNlBOMrkao7TA9Z+WopNGzv6gU0I8z6AHy9iPHgukSF9xQjxHCTbBixXxfk2XZQjudvMIADh6b7GlE1iHQmsgUZJDplrY8Ews/5wggdNv818zTXQ0+8b8XTfV9GgP8TufYAR7qna3pNZVbg8KyKElxfDeaa+ePLPR5b1H2LkMdtAIWFQT7hMdhJBor3wAHYZLmNiJr2JHrNpweG+ryUQbk8TKqrmMYA/7frNud/1vWV8PhIIeqAY9vZLxxRdTlPIdJKz7C1zWENG2S58f3oSQGVqEFaKhNwoys3GIpP/a4NmtvU9iRbPkzN8huASt3VJnhQuUuSVsHl9rDtQ4pxZ6t45+3L8yaNkNBup8J86DeH6OnRqSIhFRsQba5U3eZcgJ+X6irzrdh/114YsJVDPEzta+fC/Ly1QOy+q4K4z01KoXuA== 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: 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. Tested-by: Pengfei Xu Tested-by: John Allen Tested-by: Kees Cook Acked-by: Mike Rapoport (IBM) Reviewed-by: Kees Cook Acked-by: Peter Xu Signed-off-by: Yu-cheng Yu Reviewed-by: Axel Rasmussen Signed-off-by: Rick Edgecombe Cc: Peter Xu Cc: Mike Kravetz --- include/linux/mm.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/include/linux/mm.h b/include/linux/mm.h index af652444fbba..a1b31caae013 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -377,7 +377,7 @@ extern unsigned int kobjsize(const void *objp); #endif #ifdef CONFIG_HAVE_ARCH_USERFAULTFD_MINOR -# define VM_UFFD_MINOR_BIT 37 +# define VM_UFFD_MINOR_BIT 38 # define VM_UFFD_MINOR BIT(VM_UFFD_MINOR_BIT) /* UFFD minor faults */ #else /* !CONFIG_HAVE_ARCH_USERFAULTFD_MINOR */ # define VM_UFFD_MINOR VM_NONE