[PATCH v6 17/27] x86, kexec: only set ident mapping for ram.

[Yinghai Lu <yinghai@kernel.org>]

We should not set mapping for all under max_pfn.
That causes same problem that is fixed by

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

This patch expose pfn_mapped array, and only set ident mapping for range
in that array.

This patch rely on new ident_mapping_init that could handle sharing
pgd/pud between different calling.

Signed-off-by: Yinghai Lu <yinghai@kernel.org>
---
 arch/x86/include/asm/page.h        |    4 ++++
 arch/x86/kernel/machine_kexec_64.c |   13 ++++++++++---
 arch/x86/mm/init.c                 |    4 ++--
 3 files changed, 16 insertions(+), 5 deletions(-)

diff --git a/arch/x86/include/asm/page.h b/arch/x86/include/asm/page.h
index 8ca8283..100a20c 100644
--- a/arch/x86/include/asm/page.h
+++ b/arch/x86/include/asm/page.h
@@ -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)
 {
diff --git a/arch/x86/kernel/machine_kexec_64.c b/arch/x86/kernel/machine_kexec_64.c
index a0bf7fb..cc6d0e3 100644
--- a/arch/x86/kernel/machine_kexec_64.c
+++ b/arch/x86/kernel/machine_kexec_64.c
@@ -157,9 +157,16 @@ static int init_pgtable(struct kimage *image, unsigned long start_pgtable)
 
 	level4p = (pgd_t *)__va(start_pgtable);
 	clear_page(level4p);
-	result = ident_mapping_init(image, 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 = ident_mapping_init(image, level4p, mstart, mend);
+
+		if (result)
+			return result;
+	}
 
 	/*
 	 * segments's mem ranges could be outside 0 ~ max_pfn,
diff --git a/arch/x86/mm/init.c b/arch/x86/mm/init.c
index c4293cf..7621772 100644
--- a/arch/x86/mm/init.c
+++ b/arch/x86/mm/init.c
@@ -300,8 +300,8 @@ 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)
 {
-- 
1.7.10.4