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x86, kexec, 64bit: Only set ident mapping for ram.

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We should set mappings only for usable memory ranges under max_pfn
Otherwise causes same problem that is fixed by

	x86, mm: Only direct map addresses that are marked as E820_RAM

This patch exposes pfn_mapped array, and only sets ident mapping for ranges
in that array.

This patch relies on new kernel_ident_mapping_init that could handle existing
pgd/pud between different calls.

Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Link: http://lkml.kernel.org/r/1359058816-7615-25-git-send-email-yinghai@kernel.org
Cc: Alexander Duyck <alexander.h.duyck@intel.com>
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
This commit is contained in:
Yinghai Lu 2013-01-24 12:20:05 -08:00 committed by H. Peter Anvin
parent 9ebdc79f7a
commit 0e691cf824
3 changed files with 15 additions and 6 deletions
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4
arch/x86/include/asm/page.h
View File

@ -17,6 +17,10 @@
struct page;
#include <linux/range.h>
extern struct range pfn_mapped[];
extern int nr_pfn_mapped;
static inline void clear_user_page(void *page, unsigned long vaddr,
struct page *pg)
{

13
arch/x86/kernel/machine_kexec_64.c
View File

@ -100,10 +100,15 @@ static int init_pgtable(struct kimage *image, unsigned long start_pgtable)
level4p = (pgd_t *)__va(start_pgtable);
clear_page(level4p);
result = kernel_ident_mapping_init(&info, level4p,
0, max_pfn << PAGE_SHIFT);
if (result)
return result;
for (i = 0; i < nr_pfn_mapped; i++) {
mstart = pfn_mapped[i].start << PAGE_SHIFT;
mend = pfn_mapped[i].end << PAGE_SHIFT;
result = kernel_ident_mapping_init(&info,
level4p, mstart, mend);
if (result)
return result;
}
/*
* segments's mem ranges could be outside 0 ~ max_pfn,

4
arch/x86/mm/init.c
View File

@ -302,8 +302,8 @@ static int __meminit split_mem_range(struct map_range *mr, int nr_range,
return nr_range;
}
static struct range pfn_mapped[E820_X_MAX];
static int nr_pfn_mapped;
struct range pfn_mapped[E820_X_MAX];
int nr_pfn_mapped;
static void add_pfn_range_mapped(unsigned long start_pfn, unsigned long end_pfn)
{