[PATCH] ARM: Fix Keystone 2 kernel mapping regression
From: Linus Walleij <hidden>
Date: 2021-08-04 14:01:59
This fixes a Keystone 2 regression discovered as a side effect of
defining an passing the physical start/end sections of the kernel
to the MMU remapping code.
As the Keystone applies an offset to all physical addresses,
including those identified and patches by phys2virt, we fail to
account for this offset in the kernel_sec_start and kernel_sec_end
variables.
Further these offsets can extend into the 64bit range on LPAE
systems such as the Keystone 2.
Fix it like this:
- Extend kernel_sec_start and kernel_sec_end to be 64bit
- Add the offset also to kernel_sec_start and kernel_sec_end
As passing kernel_sec_start and kernel_sec_end as 64bit invariably
incurs endianness issues I have attempted to dry-code around
these. Please review.
Tested on the Vexpress QEMU model both with and without LPAE
enabled.
Fixes: 6e121df14ccd ("ARM: 9090/1: Map the lowmem and kernel separately")
Reported-by: Nishanth Menon <nmenon@kernel.org>
Suggested-by: Russell King <linux@armlinux.org.uk>
Signed-off-by: Linus Walleij <redacted>
---
Nishanth: Please test!
Other smart folks: please have a look at my endianness compensation
assembly.
---
arch/arm/include/asm/memory.h | 7 ++++---
arch/arm/kernel/head.S | 19 ++++++++++++++++---
arch/arm/mm/mmu.c | 9 ++++++++-
arch/arm/mm/pv-fixup-asm.S | 2 +-
4 files changed, 29 insertions(+), 8 deletions(-)
diff --git a/arch/arm/include/asm/memory.h b/arch/arm/include/asm/memory.h
index cfc9dfd70aad..f673e13e0f94 100644
--- a/arch/arm/include/asm/memory.h
+++ b/arch/arm/include/asm/memory.h@@ -160,10 +160,11 @@ extern unsigned long vectors_base; /* * Physical start and end address of the kernel sections. These addresses are - * 2MB-aligned to match the section mappings placed over the kernel. + * 2MB-aligned to match the section mappings placed over the kernel. We use + * u64 so that LPAE mappings beyond the 32bit limit will work out as well. */ -extern u32 kernel_sec_start; -extern u32 kernel_sec_end; +extern u64 kernel_sec_start; +extern u64 kernel_sec_end; /* * Physical vs virtual RAM address space conversion. These are
diff --git a/arch/arm/kernel/head.S b/arch/arm/kernel/head.S
index 9eb0b4dbcc12..49f5e04cf7e0 100644
--- a/arch/arm/kernel/head.S
+++ b/arch/arm/kernel/head.S@@ -49,7 +49,8 @@ /* * This needs to be assigned at runtime when the linker symbols are - * resolved. + * resolved. These are unsigned 64bit really, but in this assembly code + * We store them as 32bit. */ .pushsection .data .align 2
@@ -57,7 +58,9 @@ .globl kernel_sec_end kernel_sec_start: .long 0 + .long 0 kernel_sec_end: + .long 0 .long 0 .popsection
@@ -250,7 +253,12 @@ __create_page_tables: add r0, r4, #KERNEL_OFFSET >> (SECTION_SHIFT - PMD_ORDER) ldr r6, =(_end - 1) adr_l r5, kernel_sec_start @ _pa(kernel_sec_start) - str r8, [r5] @ Save physical start of kernel +#ifdef CONFIG_CPU_ENDIAN_BE8 + add r5, r5, #4 @ Move to the upper 32bit word + str r8, [r5] @ Save physical start of kernel (BE) +#else + str r8, [r5] @ Save physical start of kernel (LE) +#endif orr r3, r8, r7 @ Add the MMU flags add r6, r4, r6, lsr #(SECTION_SHIFT - PMD_ORDER) 1: str r3, [r0], #1 << PMD_ORDER
@@ -259,7 +267,12 @@ __create_page_tables: bls 1b eor r3, r3, r7 @ Remove the MMU flags adr_l r5, kernel_sec_end @ _pa(kernel_sec_end) - str r3, [r5] @ Save physical end of kernel +#ifdef CONFIG_CPU_ENDIAN_BE8 + add r5, r5, #4 @ Move to the upper 32bit word + str r8, [r5] @ Save physical end of kernel (BE) +#else + str r3, [r5] @ Save physical end of kernel (LE) +#endif #ifdef CONFIG_XIP_KERNEL /*
diff --git a/arch/arm/mm/mmu.c b/arch/arm/mm/mmu.c
index 7583bda5ea7d..a4e006005107 100644
--- a/arch/arm/mm/mmu.c
+++ b/arch/arm/mm/mmu.c@@ -1608,6 +1608,13 @@ static void __init early_paging_init(const struct machine_desc *mdesc) if (offset == 0) return; + /* + * Offset the kernel section physical offsets so that the kernel + * mapping will work out later on. + */ + kernel_sec_start += offset; + kernel_sec_end += offset; + /* * Get the address of the remap function in the 1:1 identity * mapping setup by the early page table assembly code. We
@@ -1716,7 +1723,7 @@ void __init paging_init(const struct machine_desc *mdesc) { void *zero_page; - pr_debug("physical kernel sections: 0x%08x-0x%08x\n", + pr_debug("physical kernel sections: 0x%08llx-0x%08llx\n", kernel_sec_start, kernel_sec_end); prepare_page_table();
diff --git a/arch/arm/mm/pv-fixup-asm.S b/arch/arm/mm/pv-fixup-asm.S
index 5c5e1952000a..f8e11f7c7880 100644
--- a/arch/arm/mm/pv-fixup-asm.S
+++ b/arch/arm/mm/pv-fixup-asm.S@@ -29,7 +29,7 @@ ENTRY(lpae_pgtables_remap_asm) ldr r6, =(_end - 1) add r7, r2, #0x1000 add r6, r7, r6, lsr #SECTION_SHIFT - L2_ORDER - add r7, r7, #PAGE_OFFSET >> (SECTION_SHIFT - L2_ORDER) + add r7, r7, #KERNEL_OFFSET >> (SECTION_SHIFT - L2_ORDER) 1: ldrd r4, r5, [r7] adds r4, r4, r0 adc r5, r5, r1
--
2.31.1
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