Re: [PATCH v1 1/2] x86/power/64: Support unaligned addresses for temporary mapping

[Yinghai Lu <yinghai@kernel.org>]

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On Tue, Aug 2, 2016 at 10:48 AM, Thomas Garnier <thgarnie@google.com> wrote:
> On Tue, Aug 2, 2016 at 10:36 AM, Yinghai Lu <yinghai@kernel.org> wrote:
>>
>> Looks like we need to change the loop from phys address to virtual
>> address instead.
>> to avoid the overflow.

something like attached.

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---
 arch/x86/mm/ident_map.c |   54 ++++++++++++++++++++++++++++--------------------
 1 file changed, 32 insertions(+), 22 deletions(-)

Index: linux-2.6/arch/x86/mm/ident_map.c
===================================================================
--- linux-2.6.orig/arch/x86/mm/ident_map.c
+++ linux-2.6/arch/x86/mm/ident_map.c
@@ -3,40 +3,47 @@
  * included by both the compressed kernel and the regular kernel.
  */
 
-static void ident_pmd_init(unsigned long pmd_flag, pmd_t *pmd_page,
+static void ident_pmd_init(struct x86_mapping_info *info, pmd_t *pmd_page,
 			   unsigned long addr, unsigned long end)
 {
-	addr &= PMD_MASK;
-	for (; addr < end; addr += PMD_SIZE) {
-		pmd_t *pmd = pmd_page + pmd_index(addr);
+	unsigned long off = info->kernel_mapping ? __PAGE_OFFSET : 0;
+	unsigned long vaddr = addr + off;
+	unsigned long vend = end + off;
+
+	vaddr &= PMD_MASK;
+	for (; vaddr < vend; vaddr += PMD_SIZE) {
+		pmd_t *pmd = pmd_page + pmd_index(vaddr);
 
 		if (!pmd_present(*pmd))
-			set_pmd(pmd, __pmd(addr | pmd_flag));
+			set_pmd(pmd, __pmd(vaddr - off | info->pmd_flag));
 	}
 }
 
 static int ident_pud_init(struct x86_mapping_info *info, pud_t *pud_page,
 			  unsigned long addr, unsigned long end)
 {
-	unsigned long next;
+	unsigned long off = info->kernel_mapping ? __PAGE_OFFSET : 0;
+	unsigned long vaddr = addr + off;
+	unsigned long vend = end + off;
+	unsigned long vnext;
 
-	for (; addr < end; addr = next) {
-		pud_t *pud = pud_page + pud_index(addr);
+	for (; vaddr < vend; vaddr = vnext) {
+		pud_t *pud = pud_page + pud_index(vaddr);
 		pmd_t *pmd;
 
-		next = (addr & PUD_MASK) + PUD_SIZE;
-		if (next > end)
-			next = end;
+		vnext = (vaddr & PUD_MASK) + PUD_SIZE;
+		if (vnext > vend)
+			vnext = vend;
 
 		if (pud_present(*pud)) {
 			pmd = pmd_offset(pud, 0);
-			ident_pmd_init(info->pmd_flag, pmd, addr, next);
+			ident_pmd_init(info, pmd, vaddr - off, vnext - off);
 			continue;
 		}
 		pmd = (pmd_t *)info->alloc_pgt_page(info->context);
 		if (!pmd)
 			return -ENOMEM;
-		ident_pmd_init(info->pmd_flag, pmd, addr, next);
+		ident_pmd_init(info, pmd, vaddr - off, vnext - off);
 		set_pud(pud, __pud(__pa(pmd) | _KERNPG_TABLE));
 	}
 
@@ -46,21 +53,24 @@ static int ident_pud_init(struct x86_map
 int kernel_ident_mapping_init(struct x86_mapping_info *info, pgd_t *pgd_page,
 			      unsigned long addr, unsigned long end)
 {
-	unsigned long next;
 	int result;
-	int off = info->kernel_mapping ? pgd_index(__PAGE_OFFSET) : 0;
+	unsigned long off = info->kernel_mapping ? __PAGE_OFFSET : 0;
+	unsigned long vaddr = addr + off;
+	unsigned long vend = end + off;
+	unsigned long vnext;
 
-	for (; addr < end; addr = next) {
-		pgd_t *pgd = pgd_page + pgd_index(addr) + off;
+	for (; vaddr < vend; vaddr = vnext) {
+		pgd_t *pgd = pgd_page + pgd_index(vaddr);
 		pud_t *pud;
 
-		next = (addr & PGDIR_MASK) + PGDIR_SIZE;
-		if (next > end)
-			next = end;
+		vnext = (vaddr & PGDIR_MASK) + PGDIR_SIZE;
+		if (vnext > vend)
+			vnext = vend;
 
 		if (pgd_present(*pgd)) {
 			pud = pud_offset(pgd, 0);
-			result = ident_pud_init(info, pud, addr, next);
+			result = ident_pud_init(info, pud, vaddr - off,
+						vnext - off);
 			if (result)
 				return result;
 			continue;
@@ -69,7 +79,7 @@ int kernel_ident_mapping_init(struct x86
 		pud = (pud_t *)info->alloc_pgt_page(info->context);
 		if (!pud)
 			return -ENOMEM;
-		result = ident_pud_init(info, pud, addr, next);
+		result = ident_pud_init(info, pud, vaddr - off, vnext - off);
 		if (result)
 			return result;
 		set_pgd(pgd, __pgd(__pa(pud) | _KERNPG_TABLE));