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Commit f07333fd authored by Andi Kleen's avatar Andi Kleen Committed by Ingo Molnar
Browse files

x86: implement gbpages support in change_page_attr() 



Signed-off-by: default avatarAndi Kleen <ak@suse.de>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
parent b5360222

arch/x86/mm/pageattr.c

+15 −2
Original line number Diff line number Diff line
@@ -281,7 +281,12 @@ static int try_preserve_large_page(pte_t *kpte, unsigned long address, 
		psize = PMD_PAGE_SIZE;

		pmask = PMD_PAGE_MASK;

		break;

#ifdef CONFIG_X86_64

	case PG_LEVEL_1G:

		psize = PMD_PAGE_SIZE;

		pmask = PMD_PAGE_MASK;

		break;

#endif

	default:

		res = -EINVAL;

		goto out_unlock;
@@ -343,7 +348,7 @@ static int split_large_page(pte_t *kpte, unsigned long address) 
{

	pgprot_t ref_prot;

	gfp_t gfp_flags = GFP_KERNEL;

	unsigned long flags, addr, pfn;

	unsigned long flags, addr, pfn, pfninc = 1;

	pte_t *pbase, *tmp;

	struct page *base;

	unsigned int i, level;
@@ -372,11 +377,19 @@ static int split_large_page(pte_t *kpte, unsigned long address) 
#endif

	ref_prot = pte_pgprot(pte_clrhuge(*kpte));



#ifdef CONFIG_X86_64

	if (level == PG_LEVEL_1G) {

		pfninc = PMD_PAGE_SIZE >> PAGE_SHIFT;

		pgprot_val(ref_prot) |= _PAGE_PSE;

		addr &= PUD_PAGE_MASK;

	}

#endif



	/*

	 * Get the target pfn from the original entry:

	 */

	pfn = pte_pfn(*kpte);

	for (i = 0; i < PTRS_PER_PTE; i++, pfn++)

	for (i = 0; i < PTRS_PER_PTE; i++, pfn += pfninc)

		set_pte(&pbase[i], pfn_pte(pfn, ref_prot));



	/*