From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: linux-kernel@vger.kernel.org
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
stable@vger.kernel.org, Catalin Marinas <catalin.marinas@arm.com>,
"Russell King (Oracle)" <rmk+kernel@armlinux.org.uk>
Subject: [PATCH 4.14 14/18] ARM: early traps initialisation
Date: Wed, 9 Mar 2022 16:59:44 +0100 [thread overview]
Message-ID: <20220309155856.515293861@linuxfoundation.org> (raw)
In-Reply-To: <20220309155856.090281301@linuxfoundation.org>
From: "Russell King (Oracle)" <rmk+kernel@armlinux.org.uk>
commit 04e91b7324760a377a725e218b5ee783826d30f5 upstream.
Provide a couple of helpers to copy the vectors and stubs, and also
to flush the copied vectors and stubs.
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
arch/arm/kernel/traps.c | 27 +++++++++++++++++++++------
1 file changed, 21 insertions(+), 6 deletions(-)
--- a/arch/arm/kernel/traps.c
+++ b/arch/arm/kernel/traps.c
@@ -820,10 +820,22 @@ static inline void __init kuser_init(voi
}
#endif
+#ifndef CONFIG_CPU_V7M
+static void copy_from_lma(void *vma, void *lma_start, void *lma_end)
+{
+ memcpy(vma, lma_start, lma_end - lma_start);
+}
+
+static void flush_vectors(void *vma, size_t offset, size_t size)
+{
+ unsigned long start = (unsigned long)vma + offset;
+ unsigned long end = start + size;
+
+ flush_icache_range(start, end);
+}
+
void __init early_trap_init(void *vectors_base)
{
-#ifndef CONFIG_CPU_V7M
- unsigned long vectors = (unsigned long)vectors_base;
extern char __stubs_start[], __stubs_end[];
extern char __vectors_start[], __vectors_end[];
unsigned i;
@@ -844,17 +856,20 @@ void __init early_trap_init(void *vector
* into the vector page, mapped at 0xffff0000, and ensure these
* are visible to the instruction stream.
*/
- memcpy((void *)vectors, __vectors_start, __vectors_end - __vectors_start);
- memcpy((void *)vectors + 0x1000, __stubs_start, __stubs_end - __stubs_start);
+ copy_from_lma(vectors_base, __vectors_start, __vectors_end);
+ copy_from_lma(vectors_base + 0x1000, __stubs_start, __stubs_end);
kuser_init(vectors_base);
- flush_icache_range(vectors, vectors + PAGE_SIZE * 2);
+ flush_vectors(vectors_base, 0, PAGE_SIZE * 2);
+}
#else /* ifndef CONFIG_CPU_V7M */
+void __init early_trap_init(void *vectors_base)
+{
/*
* on V7-M there is no need to copy the vector table to a dedicated
* memory area. The address is configurable and so a table in the kernel
* image can be used.
*/
-#endif
}
+#endif
next prev parent reply other threads:[~2022-03-09 16:02 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-03-09 15:59 [PATCH 4.14 00/18] 4.14.271-rc1 review Greg Kroah-Hartman
2022-03-09 15:59 ` [PATCH 4.14 01/18] x86/speculation: Merge one test in spectre_v2_user_select_mitigation() Greg Kroah-Hartman
2022-03-09 15:59 ` [PATCH 4.14 02/18] x86,bugs: Unconditionally allow spectre_v2=retpoline,amd Greg Kroah-Hartman
2022-03-09 15:59 ` [PATCH 4.14 03/18] x86/speculation: Rename RETPOLINE_AMD to RETPOLINE_LFENCE Greg Kroah-Hartman
2022-03-09 15:59 ` [PATCH 4.14 04/18] x86/speculation: Add eIBRS + Retpoline options Greg Kroah-Hartman
2022-03-09 15:59 ` [PATCH 4.14 05/18] Documentation/hw-vuln: Update spectre doc Greg Kroah-Hartman
2022-03-09 15:59 ` [PATCH 4.14 06/18] x86/speculation: Include unprivileged eBPF status in Spectre v2 mitigation reporting Greg Kroah-Hartman
2022-03-09 15:59 ` [PATCH 4.14 07/18] x86/speculation: Use generic retpoline by default on AMD Greg Kroah-Hartman
2022-03-09 15:59 ` [PATCH 4.14 08/18] x86/speculation: Update link to AMD speculation whitepaper Greg Kroah-Hartman
2022-03-09 15:59 ` [PATCH 4.14 09/18] x86/speculation: Warn about Spectre v2 LFENCE mitigation Greg Kroah-Hartman
2022-03-09 15:59 ` [PATCH 4.14 10/18] x86/speculation: Warn about eIBRS + LFENCE + Unprivileged eBPF + SMT Greg Kroah-Hartman
2022-03-09 15:59 ` [PATCH 4.14 11/18] arm/arm64: Provide a wrapper for SMCCC 1.1 calls Greg Kroah-Hartman
2022-03-09 15:59 ` [PATCH 4.14 12/18] arm/arm64: smccc/psci: add arm_smccc_1_1_get_conduit() Greg Kroah-Hartman
2022-03-09 15:59 ` [PATCH 4.14 13/18] ARM: report Spectre v2 status through sysfs Greg Kroah-Hartman
2022-03-09 15:59 ` Greg Kroah-Hartman [this message]
2022-03-09 15:59 ` [PATCH 4.14 15/18] ARM: use LOADADDR() to get load address of sections Greg Kroah-Hartman
2022-03-09 15:59 ` [PATCH 4.14 16/18] ARM: Spectre-BHB workaround Greg Kroah-Hartman
2022-03-09 15:59 ` [PATCH 4.14 17/18] ARM: include unprivileged BPF status in Spectre V2 reporting Greg Kroah-Hartman
2022-03-09 15:59 ` [PATCH 4.14 18/18] ARM: fix build error when BPF_SYSCALL is disabled Greg Kroah-Hartman
2022-03-09 18:44 ` [PATCH 4.14 00/18] 4.14.271-rc1 review Daniel Díaz
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