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    Contents of /trunk/kernel26-xen/patches-2.6.25-r1/1070-2.6.25-xen-Debug-dump-pgtables-on-make_page_readonly.patch

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    Revision 606 - (show annotations) (download)
    Thu May 22 23:13:13 2008 UTC (15 years, 11 months ago) by niro
    File size: 2482 byte(s) 
    -ver bump to 2.6.25-magellan-r1:
- linux-2.6.25.4
- fbcondecor-0.9.4
- squashfs-3.3
- unionfs-2.3.3
- tuxonice-3.0-rc7
- linux-phc-0.3.0
- acpi-dstd-0.9a
- reiser4
- xen-3.2.0
. ipw3945-1.2.2
    1 From bcd3f4ae6009563081166e6559eb9181d673d370 Mon Sep 17 00:00:00 2001
    2 From: Eduardo Habkost <ehabkost@redhat.com>
    3 Date: Tue, 18 Dec 2007 12:34:36 -0200
    4 Subject: [PATCH] Debug: dump pgtables on make_page_readonly()
    5
    6 Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
    7 ---
    8 arch/x86/mm/init_64.c | 68 +++++++++++++++++++++++++++++++++++++++++++++++++
    9 1 files changed, 68 insertions(+), 0 deletions(-)
    10
    11 diff --git a/arch/x86/mm/init_64.c b/arch/x86/mm/init_64.c
    12 index cf1453b..fddf208 100644
    13 --- a/arch/x86/mm/init_64.c
    14 +++ b/arch/x86/mm/init_64.c
    15 @@ -72,6 +72,71 @@ DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
    16
    17 #ifdef CONFIG_XEN
    18
    19 +//#define vvva(p) ((void*)((p) + __START_KERNEL_map))
    20 +#define vvva(p) __va((p))
    21 +
    22 +void show_pgtable1(pte_t *tbl, unsigned long addr)
    23 +{
    24 + pte_t *pte = tbl + pte_index(addr);
    25 + pte_val_t pv;
    26 + unsigned long *page;
    27 +
    28 + xprintk("\npte: %p\n", pte);
    29 + xprintk("\npte val: %lx\n", pte->pte);
    30 +
    31 + pv = pte_val(*pte);
    32 + if (!(pv & _PAGE_PRESENT))
    33 + return;
    34 +
    35 + page = vvva(pv & PHYSICAL_PAGE_MASK);
    36 +
    37 + xprintk("\npage: %p\n", page);
    38 + xprintk("\npage val: %lx\n", *page);
    39 +}
    40 +
    41 +void show_pgtable2(pmd_t *tbl, unsigned long addr)
    42 +{
    43 + pmd_t *pmd = tbl + pmd_index(addr);
    44 + pmd_val_t pv;
    45 +
    46 + xprintk("\npmd: %p\n", pmd);
    47 + xprintk("\npmd val: %lx\n", pmd->pmd);
    48 +
    49 + pv = pmd_val(*pmd);
    50 + if (!(pv & _PAGE_PRESENT))
    51 + return;
    52 +
    53 + show_pgtable1((pte_t*)vvva(pv & PHYSICAL_PAGE_MASK), addr);
    54 +}
    55 +
    56 +void show_pgtable3(pud_t *tbl, unsigned long addr)
    57 +{
    58 + pud_t *pud = tbl + pud_index(addr);
    59 +
    60 + xprintk("\npud: %p\n", pud);
    61 + xprintk("pud value: %lx\n", pud->pud);
    62 +
    63 + show_pgtable2((pmd_t*)vvva(pud_val(*pud) & PHYSICAL_PAGE_MASK), addr);
    64 +}
    65 +
    66 +void show_pgtable4(pgd_t *tbl, unsigned long addr)
    67 +{
    68 + pgd_t *pgd = tbl + pgd_index(addr);
    69 +
    70 + xprintk("\npgd: %p\n", pgd);
    71 + xprintk("pgd value: %lx\n", pgd->pgd);
    72 +
    73 + show_pgtable3((pud_t*)vvva(pgd_val(*pgd) & PHYSICAL_PAGE_MASK), addr);
    74 +}
    75 +
    76 +void show_pgtable(unsigned long addr)
    77 +{
    78 + xprintk("\nshowing pgtable for %lx\n", addr);
    79 +
    80 + show_pgtable4(init_level4_pgt, addr);
    81 +}
    82 +
    83 +
    84 static void __make_page_readonly(void *va)
    85 {
    86 pgd_t *pgd; pud_t *pud; pmd_t *pmd; pte_t pte, *ptep;
    87 @@ -92,6 +157,9 @@ static void __make_page_readonly(void *va)
    88
    89 if ((addr >= VMALLOC_START) && (addr < VMALLOC_END))
    90 __make_page_readonly(__va(pte_pfn(pte) << PAGE_SHIFT));
    91 +
    92 + //show_pgtable(addr);
    93 + //show_pgtable(__START_KERNEL_map + __pa(va));
    94 }
    95
    96 static void __make_page_writable(void *va)
    97 --
    98 1.5.4.1
    99