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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 Cc: rick.p.edgecombe@intel.com, Yu-cheng Yu , Peter Xu Subject: [PATCH v5 14/39] mm: Move VM_UFFD_MINOR_BIT from 37 to 38 Date: Thu, 19 Jan 2023 13:22:52 -0800 Message-Id: <20230119212317.8324-15-rick.p.edgecombe@intel.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20230119212317.8324-1-rick.p.edgecombe@intel.com> References: <20230119212317.8324-1-rick.p.edgecombe@intel.com> X-Rspamd-Server: rspam05 X-Rspamd-Queue-Id: 2748A180011 X-Stat-Signature: qp8rqr98xxmkcim6i8mwbczh6fm1a3xp X-Rspam-User: X-HE-Tag: 1674163427-716969 X-HE-Meta: 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 KdLZAAO+ VsTbP1utbwACrdbTFT4La/gTVLzekZqCbx5/XZtJSxVLm30kR8ezHpxi8sSqXviddryX9AatMLqR1Gw0T7Jabaz4M16xS6TjyYkLTfGZpqZBd6BtpCRRUktkvH4iDNofHo+TIYAyvD/Wn7q/QrShiHDEDqAdctuWk50fyQfq8HBt/qemVTDeXBGhOprNsiuQhmC3fa+WoVas8L4YR63U+5Xtolk6bxWwRdOJinHzvlT5XQqIVjdLp1IQEwNn5wh26tD5p9IqajmZuN8wJn6uj0xrGQXhHWCqN+mtaSkXYmhD+78qVwcSa1Rr44gdY9kMy17v2bgwEVSXyJpxbxK9IDBX01VBl2vnDFRvpjVby5sA0bzY0dtFplLpang4oOCXplbo9I9ZulPfBNp5iHd9a/Z0zpA== 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 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 7afc86d50442..82a9a4903651 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -366,7 +366,7 @@ 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