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bh=g5SIlfhNFVkGHqg4H9aglJHNTgTJdaH8G/qaojIJDnE=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=fi+UYaEUI3ApllTrH+WrLvAM4f0KPGB9ULkC7CRHLYRvBGxLjCI3am8deLBrDJnoI psOMxzYECWd5moN7XVrVApszsdb2OyHG/qOWJeiRdhZqeY7fLZYcOap+VENpMo8ai0 AlfXf1zM7i+XN0JkdtLCFK7q/9miEXIIWfMQxfys= From: Kevin Brodsky Date: Tue, 26 May 2026 12:15:57 +0100 Subject: [PATCH RFC v8 08/24] arm64: Initialize POR_EL1 register on cpu_resume() MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20260526-kpkeys-v8-8-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=1238; i=kevin.brodsky@arm.com; s=20260427; h=from:subject:message-id; bh=X72DCdJX2SxlqX4hafcg68D9WxF9xj/CvQA2EQYYzDc=; b=xTqK9y0/jfN6rkxWDlafJT2Opd2CvHu41k45n5VTUfNU5mVSqsubT5frcWIwDYbLHbHAM1udS SU7qCdKiicNC9JxB02tTDLd6gkulMR5AFGVMO5fVIu4p1YIXdwXjz6H X-Developer-Key: i=kevin.brodsky@arm.com; a=ed25519; pk=N2QG+eJKrvkNovwhhwJhnJ4+ScVfsGCHldmqLfcMTFs= X-Stat-Signature: iyz1p53c6u1qyus7whzifbriochzi5fn X-Rspamd-Queue-Id: 1BB1A2000F X-Rspamd-Server: rspam07 X-Rspam-User: X-HE-Tag: 1779794259-216771 X-HE-Meta: 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 gWR24poV oqT9pglXVY3i2EPj8L6o4mIKEPTzfqaZBa0nbt5ITkSlTl8tj/E4O5OMyA3QEuA5nK7dITP0b2Kd1d8IlF6IJ9jSS5VEENVW/3MMWZDZqIk8tQVRBaNNCtfRfQKl2r1gwxmls7E6skW0zyeZWk5FUHzb+ptdgmemK4lKAc+r39uWuGqOHR7HXKarSL7fXYSMhOHd6JaRvOF47g3ESW8QnzhezAi4dU7i5O8n+3qN0f/2jW0aSyy9XK1DvmhnIkM1G43Ew12BGA6Occ41ptriBm/qq7uDHYIrbOet4p2SZGqFdEKyCQVMEaQL68qOqq6EvsBHU+NQk/MWEM6Mi1SwrzAfvNg== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: From: Yeoreum Yun The POR_EL1 register is reset to an unknown value after cpu_suspend(). Since POR_EL1 always holds POR_EL1_INIT when entering cpu_suspend(), initialize POR_EL1 with POR_EL1_INIT before cpu_do_resume(). Signed-off-by: Yeoreum Yun Signed-off-by: Kevin Brodsky --- arch/arm64/kernel/sleep.S | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/arch/arm64/kernel/sleep.S b/arch/arm64/kernel/sleep.S index f093cdf71be1..e0a6ad85cd24 100644 --- a/arch/arm64/kernel/sleep.S +++ b/arch/arm64/kernel/sleep.S @@ -3,6 +3,7 @@ #include #include #include +#include #include .text @@ -134,6 +135,17 @@ SYM_FUNC_START(_cpu_resume) /* load sp from context */ ldr x2, [x0, #CPU_CTX_SP] mov sp, x2 + +#ifdef CONFIG_ARM64_POE +alternative_if_not ARM64_HAS_S1POE + b .Lskip_por_set +alternative_else_nop_endif + mov_q x2, POR_EL1_INIT + msr_s SYS_POR_EL1, x2 + /* isb can be skipped since cpu_do_resume() will do it. */ +.Lskip_por_set: +#endif /* CONFIG_ARM64_POE */ + /* * cpu_do_resume expects x0 to contain context address pointer */ -- 2.51.2