#include <asm/mmu_context.h>
#include <xen/features.h>
-#include <xen/foreign_page.h>
#include <asm/hypervisor.h>
static void pgd_test_and_unpin(pgd_t *pgd);
#ifdef CONFIG_HIGHPTE
pte = alloc_pages(GFP_KERNEL|__GFP_HIGHMEM|__GFP_REPEAT|__GFP_ZERO, 0);
- if (pte && PageHighMem(pte)) {
- struct mmuext_op op;
-
- kmap_flush_unused();
- op.cmd = MMUEXT_PIN_L1_TABLE;
- op.arg1.mfn = pfn_to_mfn(page_to_pfn(pte));
- BUG_ON(HYPERVISOR_mmuext_op(&op, 1, NULL, DOMID_SELF) < 0);
- }
#else
pte = alloc_pages(GFP_KERNEL|__GFP_REPEAT|__GFP_ZERO, 0);
#endif
if (!pte_write(*virt_to_ptep(va)))
BUG_ON(HYPERVISOR_update_va_mapping(
va, pfn_pte(pfn, PAGE_KERNEL), 0));
- } else {
- struct mmuext_op op;
-
- op.cmd = MMUEXT_UNPIN_TABLE;
- op.arg1.mfn = pfn_to_mfn(pfn);
- BUG_ON(HYPERVISOR_mmuext_op(&op, 1, NULL, DOMID_SELF) < 0);
- }
+ } else
+ clear_bit(PG_pinned, &pte->flags);
ClearPageForeign(pte);
init_page_count(pte);
}
}
-static inline void pgd_walk_set_prot(void *pt, pgprot_t flags)
+static inline int pgd_walk_set_prot(struct page *page, pgprot_t flags)
{
- struct page *page = virt_to_page(pt);
unsigned long pfn = page_to_pfn(page);
if (PageHighMem(page))
- return;
+ return pgprot_val(flags) & _PAGE_RW
+ ? test_and_clear_bit(PG_pinned, &page->flags)
+ : !test_and_set_bit(PG_pinned, &page->flags);
+
BUG_ON(HYPERVISOR_update_va_mapping(
(unsigned long)__va(pfn << PAGE_SHIFT),
pfn_pte(pfn, flags), 0));
+
+ return 0;
}
-static void pgd_walk(pgd_t *pgd_base, pgprot_t flags)
+static int pgd_walk(pgd_t *pgd_base, pgprot_t flags)
{
pgd_t *pgd = pgd_base;
pud_t *pud;
pmd_t *pmd;
- pte_t *pte;
- int g, u, m;
+ int g, u, m, flush;
if (xen_feature(XENFEAT_auto_translated_physmap))
- return;
+ return 0;
- for (g = 0; g < USER_PTRS_PER_PGD; g++, pgd++) {
+ for (g = 0, flush = 0; g < USER_PTRS_PER_PGD; g++, pgd++) {
if (pgd_none(*pgd))
continue;
pud = pud_offset(pgd, 0);
if (PTRS_PER_PUD > 1) /* not folded */
- pgd_walk_set_prot(pud,flags);
+ flush |= pgd_walk_set_prot(virt_to_page(pud),flags);
for (u = 0; u < PTRS_PER_PUD; u++, pud++) {
if (pud_none(*pud))
continue;
pmd = pmd_offset(pud, 0);
if (PTRS_PER_PMD > 1) /* not folded */
- pgd_walk_set_prot(pmd,flags);
+ flush |= pgd_walk_set_prot(virt_to_page(pmd),flags);
for (m = 0; m < PTRS_PER_PMD; m++, pmd++) {
if (pmd_none(*pmd))
continue;
- pte = pte_offset_kernel(pmd,0);
- pgd_walk_set_prot(pte,flags);
+ flush |= pgd_walk_set_prot(pmd_page(*pmd),flags);
}
}
}
(unsigned long)pgd_base,
pfn_pte(virt_to_phys(pgd_base)>>PAGE_SHIFT, flags),
UVMF_TLB_FLUSH));
+
+ return flush;
}
static void __pgd_pin(pgd_t *pgd)
{
- pgd_walk(pgd, PAGE_KERNEL_RO);
+ if (pgd_walk(pgd, PAGE_KERNEL_RO))
+ kmap_flush_unused();
xen_pgd_pin(__pa(pgd));
set_bit(PG_pinned, &virt_to_page(pgd)->flags);
}
static void __pgd_unpin(pgd_t *pgd)
{
xen_pgd_unpin(__pa(pgd));
- pgd_walk(pgd, PAGE_KERNEL);
+ if (pgd_walk(pgd, PAGE_KERNEL))
+ kmap_flush_unused();
clear_bit(PG_pinned, &virt_to_page(pgd)->flags);
}
--- /dev/null
+/*
+ * Macros for manipulating and testing page->flags
+ */
+
+#ifndef PAGE_FLAGS_H
+#define PAGE_FLAGS_H
+
+#include <linux/types.h>
+
+/*
+ * Various page->flags bits:
+ *
+ * PG_reserved is set for special pages, which can never be swapped out. Some
+ * of them might not even exist (eg empty_bad_page)...
+ *
+ * The PG_private bitflag is set if page->private contains a valid value.
+ *
+ * During disk I/O, PG_locked is used. This bit is set before I/O and
+ * reset when I/O completes. page_waitqueue(page) is a wait queue of all tasks
+ * waiting for the I/O on this page to complete.
+ *
+ * PG_uptodate tells whether the page's contents is valid. When a read
+ * completes, the page becomes uptodate, unless a disk I/O error happened.
+ *
+ * For choosing which pages to swap out, inode pages carry a PG_referenced bit,
+ * which is set any time the system accesses that page through the (mapping,
+ * index) hash table. This referenced bit, together with the referenced bit
+ * in the page tables, is used to manipulate page->age and move the page across
+ * the active, inactive_dirty and inactive_clean lists.
+ *
+ * Note that the referenced bit, the page->lru list_head and the active,
+ * inactive_dirty and inactive_clean lists are protected by the
+ * zone->lru_lock, and *NOT* by the usual PG_locked bit!
+ *
+ * PG_error is set to indicate that an I/O error occurred on this page.
+ *
+ * PG_arch_1 is an architecture specific page state bit. The generic code
+ * guarantees that this bit is cleared for a page when it first is entered into
+ * the page cache.
+ *
+ * PG_highmem pages are not permanently mapped into the kernel virtual address
+ * space, they need to be kmapped separately for doing IO on the pages. The
+ * struct page (these bits with information) are always mapped into kernel
+ * address space...
+ */
+
+/*
+ * Don't use the *_dontuse flags. Use the macros. Otherwise you'll break
+ * locked- and dirty-page accounting.
+ *
+ * The page flags field is split into two parts, the main flags area
+ * which extends from the low bits upwards, and the fields area which
+ * extends from the high bits downwards.
+ *
+ * | FIELD | ... | FLAGS |
+ * N-1 ^ 0
+ * (N-FLAGS_RESERVED)
+ *
+ * The fields area is reserved for fields mapping zone, node and SPARSEMEM
+ * section. The boundry between these two areas is defined by
+ * FLAGS_RESERVED which defines the width of the fields section
+ * (see linux/mmzone.h). New flags must _not_ overlap with this area.
+ */
+#define PG_locked 0 /* Page is locked. Don't touch. */
+#define PG_error 1
+#define PG_referenced 2
+#define PG_uptodate 3
+
+#define PG_dirty 4
+#define PG_lru 5
+#define PG_active 6
+#define PG_slab 7 /* slab debug (Suparna wants this) */
+
+#define PG_checked 8 /* kill me in 2.5.<early>. */
+#define PG_arch_1 9
+#define PG_reserved 10
+#define PG_private 11 /* Has something at ->private */
+
+#define PG_writeback 12 /* Page is under writeback */
+#define PG_nosave 13 /* Used for system suspend/resume */
+#define PG_compound 14 /* Part of a compound page */
+#define PG_swapcache 15 /* Swap page: swp_entry_t in private */
+
+#define PG_mappedtodisk 16 /* Has blocks allocated on-disk */
+#define PG_reclaim 17 /* To be reclaimed asap */
+#define PG_nosave_free 18 /* Free, should not be written */
+#define PG_buddy 19 /* Page is free, on buddy lists */
+
+
+#if (BITS_PER_LONG > 32)
+/*
+ * 64-bit-only flags build down from bit 31
+ *
+ * 32 bit -------------------------------| FIELDS | FLAGS |
+ * 64 bit | FIELDS | ?????? FLAGS |
+ * 63 32 0
+ */
+#define PG_uncached 31 /* Page has been mapped as uncached */
+#endif
+
+#define PG_foreign 20 /* Page is owned by foreign allocator. */
+
+/*
+ * Manipulation of page state flags
+ */
+#define PageLocked(page) \
+ test_bit(PG_locked, &(page)->flags)
+#define SetPageLocked(page) \
+ set_bit(PG_locked, &(page)->flags)
+#define TestSetPageLocked(page) \
+ test_and_set_bit(PG_locked, &(page)->flags)
+#define ClearPageLocked(page) \
+ clear_bit(PG_locked, &(page)->flags)
+#define TestClearPageLocked(page) \
+ test_and_clear_bit(PG_locked, &(page)->flags)
+
+#define PageError(page) test_bit(PG_error, &(page)->flags)
+#define SetPageError(page) set_bit(PG_error, &(page)->flags)
+#define ClearPageError(page) clear_bit(PG_error, &(page)->flags)
+
+#define PageReferenced(page) test_bit(PG_referenced, &(page)->flags)
+#define SetPageReferenced(page) set_bit(PG_referenced, &(page)->flags)
+#define ClearPageReferenced(page) clear_bit(PG_referenced, &(page)->flags)
+#define TestClearPageReferenced(page) test_and_clear_bit(PG_referenced, &(page)->flags)
+
+#define PageUptodate(page) test_bit(PG_uptodate, &(page)->flags)
+#ifdef CONFIG_S390
+#define SetPageUptodate(_page) \
+ do { \
+ struct page *__page = (_page); \
+ if (!test_and_set_bit(PG_uptodate, &__page->flags)) \
+ page_test_and_clear_dirty(_page); \
+ } while (0)
+#else
+#define SetPageUptodate(page) set_bit(PG_uptodate, &(page)->flags)
+#endif
+#define ClearPageUptodate(page) clear_bit(PG_uptodate, &(page)->flags)
+
+#define PageDirty(page) test_bit(PG_dirty, &(page)->flags)
+#define SetPageDirty(page) set_bit(PG_dirty, &(page)->flags)
+#define TestSetPageDirty(page) test_and_set_bit(PG_dirty, &(page)->flags)
+#define ClearPageDirty(page) clear_bit(PG_dirty, &(page)->flags)
+#define __ClearPageDirty(page) __clear_bit(PG_dirty, &(page)->flags)
+#define TestClearPageDirty(page) test_and_clear_bit(PG_dirty, &(page)->flags)
+
+#define PageLRU(page) test_bit(PG_lru, &(page)->flags)
+#define SetPageLRU(page) set_bit(PG_lru, &(page)->flags)
+#define ClearPageLRU(page) clear_bit(PG_lru, &(page)->flags)
+#define __ClearPageLRU(page) __clear_bit(PG_lru, &(page)->flags)
+
+#define PageActive(page) test_bit(PG_active, &(page)->flags)
+#define SetPageActive(page) set_bit(PG_active, &(page)->flags)
+#define ClearPageActive(page) clear_bit(PG_active, &(page)->flags)
+#define __ClearPageActive(page) __clear_bit(PG_active, &(page)->flags)
+
+#define PageSlab(page) test_bit(PG_slab, &(page)->flags)
+#define __SetPageSlab(page) __set_bit(PG_slab, &(page)->flags)
+#define __ClearPageSlab(page) __clear_bit(PG_slab, &(page)->flags)
+
+#ifdef CONFIG_HIGHMEM
+#define PageHighMem(page) is_highmem(page_zone(page))
+#else
+#define PageHighMem(page) 0 /* needed to optimize away at compile time */
+#endif
+
+#define PageChecked(page) test_bit(PG_checked, &(page)->flags)
+#define SetPageChecked(page) set_bit(PG_checked, &(page)->flags)
+#define ClearPageChecked(page) clear_bit(PG_checked, &(page)->flags)
+
+#define PageReserved(page) test_bit(PG_reserved, &(page)->flags)
+#define SetPageReserved(page) set_bit(PG_reserved, &(page)->flags)
+#define ClearPageReserved(page) clear_bit(PG_reserved, &(page)->flags)
+#define __ClearPageReserved(page) __clear_bit(PG_reserved, &(page)->flags)
+
+#define SetPagePrivate(page) set_bit(PG_private, &(page)->flags)
+#define ClearPagePrivate(page) clear_bit(PG_private, &(page)->flags)
+#define PagePrivate(page) test_bit(PG_private, &(page)->flags)
+#define __SetPagePrivate(page) __set_bit(PG_private, &(page)->flags)
+#define __ClearPagePrivate(page) __clear_bit(PG_private, &(page)->flags)
+
+#define PageWriteback(page) test_bit(PG_writeback, &(page)->flags)
+#define SetPageWriteback(page) \
+ do { \
+ if (!test_and_set_bit(PG_writeback, \
+ &(page)->flags)) \
+ inc_zone_page_state(page, NR_WRITEBACK); \
+ } while (0)
+#define TestSetPageWriteback(page) \
+ ({ \
+ int ret; \
+ ret = test_and_set_bit(PG_writeback, \
+ &(page)->flags); \
+ if (!ret) \
+ inc_zone_page_state(page, NR_WRITEBACK); \
+ ret; \
+ })
+#define ClearPageWriteback(page) \
+ do { \
+ if (test_and_clear_bit(PG_writeback, \
+ &(page)->flags)) \
+ dec_zone_page_state(page, NR_WRITEBACK); \
+ } while (0)
+#define TestClearPageWriteback(page) \
+ ({ \
+ int ret; \
+ ret = test_and_clear_bit(PG_writeback, \
+ &(page)->flags); \
+ if (ret) \
+ dec_zone_page_state(page, NR_WRITEBACK); \
+ ret; \
+ })
+
+#define PageNosave(page) test_bit(PG_nosave, &(page)->flags)
+#define SetPageNosave(page) set_bit(PG_nosave, &(page)->flags)
+#define TestSetPageNosave(page) test_and_set_bit(PG_nosave, &(page)->flags)
+#define ClearPageNosave(page) clear_bit(PG_nosave, &(page)->flags)
+#define TestClearPageNosave(page) test_and_clear_bit(PG_nosave, &(page)->flags)
+
+#define PageNosaveFree(page) test_bit(PG_nosave_free, &(page)->flags)
+#define SetPageNosaveFree(page) set_bit(PG_nosave_free, &(page)->flags)
+#define ClearPageNosaveFree(page) clear_bit(PG_nosave_free, &(page)->flags)
+
+#define PageBuddy(page) test_bit(PG_buddy, &(page)->flags)
+#define __SetPageBuddy(page) __set_bit(PG_buddy, &(page)->flags)
+#define __ClearPageBuddy(page) __clear_bit(PG_buddy, &(page)->flags)
+
+#define PageMappedToDisk(page) test_bit(PG_mappedtodisk, &(page)->flags)
+#define SetPageMappedToDisk(page) set_bit(PG_mappedtodisk, &(page)->flags)
+#define ClearPageMappedToDisk(page) clear_bit(PG_mappedtodisk, &(page)->flags)
+
+#define PageReclaim(page) test_bit(PG_reclaim, &(page)->flags)
+#define SetPageReclaim(page) set_bit(PG_reclaim, &(page)->flags)
+#define ClearPageReclaim(page) clear_bit(PG_reclaim, &(page)->flags)
+#define TestClearPageReclaim(page) test_and_clear_bit(PG_reclaim, &(page)->flags)
+
+#define PageCompound(page) test_bit(PG_compound, &(page)->flags)
+#define __SetPageCompound(page) __set_bit(PG_compound, &(page)->flags)
+#define __ClearPageCompound(page) __clear_bit(PG_compound, &(page)->flags)
+
+#ifdef CONFIG_SWAP
+#define PageSwapCache(page) test_bit(PG_swapcache, &(page)->flags)
+#define SetPageSwapCache(page) set_bit(PG_swapcache, &(page)->flags)
+#define ClearPageSwapCache(page) clear_bit(PG_swapcache, &(page)->flags)
+#else
+#define PageSwapCache(page) 0
+#endif
+
+#define PageUncached(page) test_bit(PG_uncached, &(page)->flags)
+#define SetPageUncached(page) set_bit(PG_uncached, &(page)->flags)
+#define ClearPageUncached(page) clear_bit(PG_uncached, &(page)->flags)
+
+#define PageForeign(page) test_bit(PG_foreign, &(page)->flags)
+#define SetPageForeign(page, dtor) do { \
+ set_bit(PG_foreign, &(page)->flags); \
+ (page)->mapping = (void *)dtor; \
+} while (0)
+#define ClearPageForeign(page) do { \
+ clear_bit(PG_foreign, &(page)->flags); \
+ (page)->mapping = NULL; \
+} while (0)
+#define PageForeignDestructor(page) \
+ ( (void (*) (struct page *)) (page)->mapping )(page)
+
+struct page; /* forward declaration */
+
+int test_clear_page_dirty(struct page *page);
+int test_clear_page_writeback(struct page *page);
+int test_set_page_writeback(struct page *page);
+
+static inline void clear_page_dirty(struct page *page)
+{
+ test_clear_page_dirty(page);
+}
+
+static inline void set_page_writeback(struct page *page)
+{
+ test_set_page_writeback(page);
+}
+
+#endif /* PAGE_FLAGS_H */
projects / xen.git / commitdiff