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bh=XtqotHlvxdKu6c1pkEmCr60+1y0cB/ILuH7HTvPuXjw=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=PxqbdS+pd+qvRVofosuD4tlqbJ7HsIW/t2HCH4ya398Dgi87CJg99yt1Aq+nYBx3x tJeSVt6Z+lgZ5rznTTAG01eKmn3j08thN12Dm6pfExf+Cw28K1ncj7kiMuyRh2rlRz Vi/pS7waFfujziQjgHIDFLnl/Gys+XIOsvpJEjyk= From: Kevin Brodsky Date: Tue, 26 May 2026 12:16:12 +0100 Subject: [PATCH RFC v8 23/24] arm64: kpkeys: Enable kpkeys_hardened_pgtables support MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20260526-kpkeys-v8-23-eaaacdacc67c@arm.com> References: <20260526-kpkeys-v8-0-eaaacdacc67c@arm.com> In-Reply-To: <20260526-kpkeys-v8-0-eaaacdacc67c@arm.com> To: linux-hardening@vger.kernel.org Cc: Kevin Brodsky , Andrew Morton , Andy Lutomirski , Catalin Marinas , Dave Hansen , "David Hildenbrand (Arm)" , Ira Weiny , Jann Horn , Jeff Xu , Joey Gouly , Kees Cook , Linus Walleij , Marc Zyngier , Mark Brown , Matthew Wilcox , Maxwell Bland , "Mike Rapoport (IBM)" , Peter Zijlstra , Pierre Langlois , Quentin Perret , Rick Edgecombe , Ryan Roberts , Vlastimil Babka , Will Deacon , Yang Shi , Yeoreum Yun , linux-arm-kernel@lists.infradead.org, linux-mm@kvack.org, x86@kernel.org, Lorenzo Stoakes , Thomas Gleixner X-Mailer: b4 0.15.2 X-Developer-Signature: v=1; a=ed25519-sha256; t=1779794212; l=1336; i=kevin.brodsky@arm.com; s=20260427; h=from:subject:message-id; bh=XtqotHlvxdKu6c1pkEmCr60+1y0cB/ILuH7HTvPuXjw=; b=q0ZKlig0pvkMsU5Rzr4TwUPY7q5CPoZ2WFpVnQeproPcajfAQtMhWY4OrW4f5EEK4yAYTdeAF aJZlzPdmgGTBxVIfR8IvUJ7u8XA5UlNnr2EiRJ+77v+PI5otrILrtOO X-Developer-Key: i=kevin.brodsky@arm.com; a=ed25519; pk=N2QG+eJKrvkNovwhhwJhnJ4+ScVfsGCHldmqLfcMTFs= X-Stat-Signature: xwatkto1ueghtiwr5x19s1ob8demrwyh X-Rspamd-Queue-Id: 14AD240009 X-Rspamd-Server: rspam07 X-Rspam-User: X-HE-Tag: 1779794337-155201 X-HE-Meta: U2FsdGVkX1+mZQQAYpH8pX+lnrGXzD2dZmPFloTZnma2kkb04/IqY/PTqCCAvs+o/a4+X2j8CLJTArT8Lqwi6+YHPKJyb8Yz0m7aQqjDc4QcrvP4nkm9eF0qTgfJdtRdBi0Ob1mMj9mvqDN8n8L96wA9+BtCZxSo5ODrus9znJhHSIMp2nTO/VVwyLQaYXiOzYvvmzB1d0m9g/6SLGpqW2tkbjjmg/EhAbgl41tUEWojr9supyo7aWW+I0D5iOovb8UCewMztfxzSzp/0co3UKKkJegtP72D2oAOOUEi9wpiCI9xRfHz8gyLNkOdJVW/hDdMMGhBP+Jcn4Z3TyIKacR17XNicYRP9CVl7btdSRKr+ns2tEtNd4rISlz6MWVIYRB7/5hC8LYy0dmcUz8tZANe9pmkbSpzDnpvAPZI7fswdy3FHTkQLTy2nSTV1vgoTuqmgX+YMoyYsWOqM3CeKkaUnnYdXji/dJf50IND6ZYgHqlEoInHlgVidOi5WDdAVMDw37kSgZ7NklYkiZ+i6GMUv3yAXuvcPCL4RMZyEsI+pyRgnk2lYXAc7AfVGUr+KOgjJQHM5gnnWG/bGaRbvlOkgZWZG8o2q4XqDBBdYhw+f9St+3itM+LW+I7jZqnCxiUH/fiDssIiB5qswbS+nSE3xHSfoRM553Nu1xLs28s2rAoGffkC0DaoADV1yPoVbDv6kHDsvDo7hcWHoaTYnV0ugSmyownElRE17S35JRsYrdUx99QaTVywzs1QRc3omr9y7c4GJUp+Lsf4itL2oM2v2awWw2oQL3T7giwH8hxJOOgbwLPpq1ccek481+5cWeixYNVmlsm/t/nmsvBmfp2CcRtTOkX4PmV2CtDECRkhzXcruknrtKoyIrA1gv71e/+ohpIRczxp6xPUmnvV3ndpNMjz43fiPlBib8/FBgazftowaq0KK/2bIwdwvOxSKSW7A+or1Ugp6FRqQoB UYh00zxk udOzICzy6D+ZxHjREb6Zl03bKR4+Ix4f1KDLLIVGCLh/kYv1wSB4RRklToGAyZccwhch2fcN2W9GU/0Tvt+jR4doSLCgwTi6kM12or4n8tvWHVTqaP4oIi0mpFeMqOIA928Tru9jwKLjWedsY71xIXGCtRDSu/vcW92LAq7WrTq7FFpSAiinZJTLM7zAkYwHKyWS85Uka/TGciubtkqGxSqwzRfeREWSt0wS1XDf31OCN4FEhqLX4QaUaikYN3vz7+Lkce1nkQT+Pu4GbbQJu/r5ywEOOr4WCYRztW5siPqQ+zpo= Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: The kpkeys_hardened_pgtables feature needs to be initialised as soon as the buddy allocator becomes available. The canonical place to handle this is mem_init(). With that done, all the bits are in place and we can advertise support for kpkeys_hardened_pgtables by selecting ARCH_HAS_KPKEYS_HARDENED_PGTABLES if ARM64_POE is enabled. Signed-off-by: Kevin Brodsky --- arch/arm64/Kconfig | 1 + arch/arm64/mm/init.c | 1 + 2 files changed, 2 insertions(+) diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig index ab06324a50ae..43d3ab744535 100644 --- a/arch/arm64/Kconfig +++ b/arch/arm64/Kconfig @@ -2146,6 +2146,7 @@ config ARM64_POE select ARCH_USES_HIGH_VMA_FLAGS select ARCH_HAS_PKEYS select ARCH_HAS_KPKEYS + select ARCH_HAS_KPKEYS_HARDENED_PGTABLES help The Permission Overlay Extension is used to implement Memory Protection Keys. Memory Protection Keys provides a mechanism for diff --git a/arch/arm64/mm/init.c b/arch/arm64/mm/init.c index 97987f850a33..7985045875cf 100644 --- a/arch/arm64/mm/init.c +++ b/arch/arm64/mm/init.c @@ -386,6 +386,7 @@ bool page_alloc_available __ro_after_init; void __init mem_init(void) { page_alloc_available = true; + kpkeys_hardened_pgtables_init(); swiotlb_update_mem_attributes(); } -- 2.51.2