FAILED: patch "[PATCH] x86/mm: Expand static page table for fixmap space" failed to apply to 4.4-stable tree
Subsystems (4)
[email protected]
maintainerThe patch below does not apply to the 4.4-stable tree.
If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <[email protected]>.
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
Quoted 1 line
From
05ab1d8a4b36ee912b7087c6da127439ed0a903eMon Sep 17 00:00:00 2001
From: Feng Tang <[email protected]>
Date: Thu, 20 Sep 2018 10:58:28 +0800
Subject: [PATCH] x86/mm: Expand static page table for fixmap space
We met a kernel panic when enabling earlycon, which is due to the fixmap address of earlycon is not statically setup.
Currently the static fixmap setup in head_64.S only covers 2M virtual address space, while it actually could be in 4M space with different kernel configurations, e.g. when VSYSCALL emulation is disabled.
So increase the static space to 4M for now by defining FIXMAP_PMD_NUM to 2, and add a build time check to ensure that the fixmap is covered by the initial static page tables.
Fixes 1ad83c858c7d ("x86_64,vsyscall: Make vsyscall emulation configurable")
Suggested-by Thomas Gleixner <[email protected]>
Signed-off-by Feng Tang <[email protected]>
Signed-off-by Thomas Gleixner <[email protected]>
Tested-by kernel test robot <[email protected]>
Reviewed-by Juergen Gross <[email protected]> (Xen parts)
Cc H Peter Anvin <[email protected]>
Cc Peter Zijlstra <[email protected]>
Cc Michal Hocko <[email protected]>
Cc Yinghai Lu <[email protected]>
Cc Dave Hansen <[email protected]>
Cc Andi Kleen <[email protected]>
Cc Andy Lutomirsky <[email protected]>
arch/x86/include/asm/fixmap.h +10 -0
@@ -14,6 +14,16 @@#ifndef _ASM_X86_FIXMAP_H#define _ASM_X86_FIXMAP_H +/* +* Exposed to assembly code for setting up initial page tables. Cannot be +* calculated in assembly code (fixmap entries are an enum), but is sanity +* checked in the actual fixmap C code to make sure that the fixmap is +* covered fully. +*/ +#define FIXMAP_PMD_NUM 2 +/* fixmap starts downwards from the 507th entry in level2_fixmap_pgt */ +#define FIXMAP_PMD_TOP 507 +#ifndef __ASSEMBLY__#include <linux/kernel.h> #include <asm/acpi.h>
arch/x86/include/asm/pgtable_64.h +2 -1
@@ -14,6 +14,7 @@#include <asm/processor.h> #include <linux/bitops.h> #include <linux/threads.h> +#include <asm/fixmap.h> extern p4d_t level4_kernel_pgt[512 ];extern p4d_t level4_ident_pgt[512 ];
@@ -22,7 +23,7 @@ extern pud_t level3_ident_pgt[512];extern pmd_t level2_kernel_pgt[512 ];extern pmd_t level2_fixmap_pgt[512 ];extern pmd_t level2_ident_pgt[512 ]; -extern pte_t level1_fixmap_pgt[512 ]; +extern pte_t level1_fixmap_pgt[512 *FIXMAP_PMD_NUM ];extern pgd_t init_top_pgt[];#define swapper_pg_dir init_top_pgt
arch/x86/kernel/head64.c +3 -1
@@ -35,6 +35,7 @@#include <asm/bootparam_utils.h> #include <asm/microcode.h> #include <asm/kasan.h> +#include <asm/fixmap.h> /* * Manage page tables very early on.
@@ -166,7 +167,8 @@ unsigned long __head __startup_64(unsigned long physaddr, pud[511 ] += load_delta; pmd =fixup_pointer (level2_fixmap_pgt, physaddr); - pmd[506 ] += load_delta; +for (i =FIXMAP_PMD_TOP ; i >FIXMAP_PMD_TOP -FIXMAP_PMD_NUM ; i--) + pmd[i] += load_delta;/* * Set up the identity mapping for the switchover. These
arch/x86/kernel/head_64.S +12 -4
@@ -24,6 +24,7 @@ #include "../entry/calling.h" #include <asm/export.h> #include <asm/nospec-branch.h> +#include <asm/fixmap.h> #ifdef CONFIG_PARAVIRT #include <asm/asm-offsets.h>
@@ -445,13 +446,20 @@ NEXT_PAGE(level2_kernel_pgt) KERNEL_IMAGE_SIZE/PMD_SIZE) NEXT_PAGE(level2_fixmap_pgt) - .fill 506,8,0 - .quad level1_fixmap_pgt - __START_KERNEL_map + _PAGE_TABLE_NOENC - /* 8MB reserved for vsyscalls + a 2MB hole = 4 + 1 entries */ - .fill 5,8,0 + .fill (512 - 4 - FIXMAP_PMD_NUM),8,0 + pgtno = 0 + .rept (FIXMAP_PMD_NUM) + .quad level1_fixmap_pgt + (pgtno << PAGE_SHIFT) - __START_KERNEL_map \ + + _PAGE_TABLE_NOENC; + pgtno = pgtno + 1 + .endr + /* 6 MB reserved space + a 2MB hole */ + .fill 4,8,0 NEXT_PAGE(level1_fixmap_pgt) + .rept (FIXMAP_PMD_NUM) .fill 512,8,0 + .endr #undef PMDS
arch/x86/mm/pgtable.c +9 -0
@@ -637,6 +637,15 @@ void __native_set_fixmap(enum fixed_addresses idx, pte_t pte) {unsigned long address =__fix_to_virt (idx); +#ifdef CONFIG_X86_64 +/* +* Ensure that the static initial page tables are covering the +* fixmap completely. +*/ +BUILD_BUG_ON (__end_of_permanent_fixed_addresses > + (FIXMAP_PMD_NUM *PTRS_PER_PTE )); +#endif +if (idx >= __end_of_fixed_addresses) {BUG ();return ;
arch/x86/xen/mmu_pv.c +6 -2
@@ -1907,7 +1907,7 @@ void __init xen_setup_kernel_pagetable(pgd_t *pgd, unsigned long max_pfn)/* L3_k[511] -> level2_fixmap_pgt */ convert_pfn_mfn (level3_kernel_pgt); -/* L3_k[511][506] -> level1_fixmap_pgt */ +/* L3_k[511][508-FIXMAP_PMD_NUM ... 507] -> level1_fixmap_pgt */ convert_pfn_mfn (level2_fixmap_pgt);/* We get [511][511] and have Xen's version of level2_kernel_pgt */
@@ -1952,7 +1952,11 @@ void __init xen_setup_kernel_pagetable(pgd_t *pgd, unsigned long max_pfn)set_page_prot (level2_ident_pgt,PAGE_KERNEL_RO );set_page_prot (level2_kernel_pgt,PAGE_KERNEL_RO );set_page_prot (level2_fixmap_pgt,PAGE_KERNEL_RO ); -set_page_prot (level1_fixmap_pgt,PAGE_KERNEL_RO ); + +for (i =0 ; i <FIXMAP_PMD_NUM ; i++) { +set_page_prot (level1_fixmap_pgt + i *PTRS_PER_PTE , +PAGE_KERNEL_RO ); + }/* Pin down new L4 */ pin_pagetable_pfn(MMUEXT_PIN_L4_TABLE,