From: Kevin Brodsky <kevin.brodsky@arm•com>
To: linux-hardening@vger•kernel.org
Cc: Kevin Brodsky <kevin.brodsky@arm•com>,
Andrew Morton <akpm@linux-foundation•org>,
Andy Lutomirski <luto@kernel•org>,
Catalin Marinas <catalin.marinas@arm•com>,
Dave Hansen <dave.hansen@linux•intel.com>,
"David Hildenbrand (Arm)" <david@kernel•org>,
Ira Weiny <ira.weiny@intel•com>, Jann Horn <jannh@google•com>,
Jeff Xu <jeffxu@chromium•org>, Joey Gouly <joey.gouly@arm•com>,
Kees Cook <kees@kernel•org>, Linus Walleij <linusw@kernel•org>,
Marc Zyngier <maz@kernel•org>, Mark Brown <broonie@kernel•org>,
Matthew Wilcox <willy@infradead•org>,
Maxwell Bland <mbland@motorola•com>,
"Mike Rapoport (IBM)" <rppt@kernel•org>,
Peter Zijlstra <peterz@infradead•org>,
Pierre Langlois <pierre.langlois@arm•com>,
Quentin Perret <qperret@google•com>,
Rick Edgecombe <rick.p.edgecombe@intel•com>,
Ryan Roberts <ryan.roberts@arm•com>,
Vlastimil Babka <vbabka@kernel•org>,
Will Deacon <will@kernel•org>,
Yang Shi <yang@os•amperecomputing.com>,
Yeoreum Yun <yeoreum.yun@arm•com>,
linux-arm-kernel@lists•infradead.org, linux-mm@kvack•org,
x86@kernel•org, Lorenzo Stoakes <ljs@kernel•org>,
Thomas Gleixner <tglx@kernel•org>
Subject: [PATCH RFC v8 08/24] arm64: Initialize POR_EL1 register on cpu_resume()
Date: Tue, 26 May 2026 12:15:57 +0100 [thread overview]
Message-ID: <20260526-kpkeys-v8-8-eaaacdacc67c@arm.com> (raw)
In-Reply-To: <20260526-kpkeys-v8-0-eaaacdacc67c@arm.com>
From: Yeoreum Yun <yeoreum.yun@arm•com>
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 <yeoreum.yun@arm•com>
Signed-off-by: Kevin Brodsky <kevin.brodsky@arm•com>
---
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 <linux/linkage.h>
#include <asm/asm-offsets.h>
#include <asm/assembler.h>
+#include <asm/kpkeys.h>
#include <asm/smp.h>
.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
next prev parent reply other threads:[~2026-05-26 11:17 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-05-26 11:15 [PATCH RFC v8 00/24] pkeys-based page table hardening Kevin Brodsky
2026-05-26 11:15 ` [PATCH RFC v8 01/24] mm: Introduce kpkeys Kevin Brodsky
2026-05-26 13:17 ` Linus Walleij
2026-05-27 8:24 ` Kevin Brodsky
2026-05-26 11:15 ` [PATCH RFC v8 02/24] set_memory: Introduce set_memory_pkey() stub Kevin Brodsky
2026-05-26 11:15 ` [PATCH RFC v8 03/24] arm64: mm: Enable overlays for all EL1 indirect permissions Kevin Brodsky
2026-05-26 11:15 ` [PATCH RFC v8 04/24] arm64: Introduce por_elx_set_pkey_perms() helper Kevin Brodsky
2026-05-26 11:15 ` [PATCH RFC v8 05/24] arm64: Implement asm/kpkeys.h using POE Kevin Brodsky
2026-05-26 11:15 ` [PATCH RFC v8 06/24] arm64: set_memory: Implement set_memory_pkey() Kevin Brodsky
2026-05-26 11:15 ` [PATCH RFC v8 07/24] arm64: Context-switch POR_EL1 Kevin Brodsky
2026-05-26 11:15 ` Kevin Brodsky [this message]
2026-05-26 11:15 ` [PATCH RFC v8 09/24] arm64: Enable kpkeys Kevin Brodsky
2026-05-26 11:15 ` [PATCH RFC v8 10/24] memblock: Move INIT_MEMBLOCK_* macros to header Kevin Brodsky
2026-05-26 11:16 ` [PATCH RFC v8 11/24] mm: kpkeys: Introduce kpkeys_hardened_pgtables feature Kevin Brodsky
2026-05-26 11:16 ` [PATCH RFC v8 12/24] mm: kpkeys: Protect regular page tables Kevin Brodsky
2026-05-26 11:16 ` [PATCH RFC v8 13/24] mm: kpkeys: Introduce early page table allocator Kevin Brodsky
2026-05-26 11:16 ` [PATCH RFC v8 14/24] mm: kpkeys: Protect vmemmap page tables Kevin Brodsky
2026-05-26 11:16 ` [PATCH RFC v8 15/24] mm: kpkeys: Introduce hook for protecting static " Kevin Brodsky
2026-05-26 11:16 ` [PATCH RFC v8 16/24] arm64: kpkeys: Implement arch_supports_kpkeys_early() Kevin Brodsky
2026-05-26 11:16 ` [PATCH RFC v8 17/24] arm64: kpkeys: Support KPKEYS_CTX_PGTABLES Kevin Brodsky
2026-05-26 11:16 ` [PATCH RFC v8 18/24] arm64: kpkeys: Ensure the linear map can be modified Kevin Brodsky
2026-05-26 11:16 ` [PATCH RFC v8 19/24] arm64: kpkeys: Protect early page tables Kevin Brodsky
2026-05-26 11:16 ` [PATCH RFC v8 20/24] arm64: kpkeys: Protect init_pg_dir Kevin Brodsky
2026-05-26 11:16 ` [PATCH RFC v8 21/24] arm64: kpkeys: Guard page table writes Kevin Brodsky
2026-05-26 11:16 ` [PATCH RFC v8 22/24] arm64: kpkeys: Batch KPKEYS_CTX_PGTABLES switches Kevin Brodsky
2026-05-26 11:16 ` [PATCH RFC v8 23/24] arm64: kpkeys: Enable kpkeys_hardened_pgtables support Kevin Brodsky
2026-05-26 11:16 ` [PATCH RFC v8 24/24] mm: Add basic tests for kpkeys_hardened_pgtables Kevin Brodsky
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