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    Subject[RFT PATCH v3 9/9] RISC-V: Add page table dump support for uefi
    Date
    Extend the current page table dump support in RISC-V to include efi
    pages as well.

    Here is the output of efi runtime page table mappings.

    ---[ UEFI runtime start ]---
    0x0000000020002000-0x0000000020003000 0x00000000be732000 4K PTE D A . . . W R V
    0x0000000020018000-0x0000000020019000 0x00000000be738000 4K PTE D A . . . W R V
    0x000000002002c000-0x000000002002d000 0x00000000be73c000 4K PTE D A . . . W R V
    0x0000000020031000-0x0000000020032000 0x00000000bff61000 4K PTE D A . . X W R V
    ---[ UEFI runtime end ]---

    Signed-off-by: Atish Patra <atish.patra@wdc.com>
    ---
    arch/riscv/mm/ptdump.c | 48 ++++++++++++++++++++++++++++++++++++------
    1 file changed, 42 insertions(+), 6 deletions(-)

    diff --git a/arch/riscv/mm/ptdump.c b/arch/riscv/mm/ptdump.c
    index 0831c2e61a8f..ace74dec7492 100644
    --- a/arch/riscv/mm/ptdump.c
    +++ b/arch/riscv/mm/ptdump.c
    @@ -3,6 +3,7 @@
    * Copyright (C) 2019 SiFive
    */

    +#include <linux/efi.h>
    #include <linux/init.h>
    #include <linux/debugfs.h>
    #include <linux/seq_file.h>
    @@ -49,6 +50,14 @@ struct addr_marker {
    const char *name;
    };

    +/* Private information for debugfs */
    +struct ptd_mm_info {
    + struct mm_struct *mm;
    + const struct addr_marker *markers;
    + unsigned long base_addr;
    + unsigned long end;
    +};
    +
    static struct addr_marker address_markers[] = {
    #ifdef CONFIG_KASAN
    {KASAN_SHADOW_START, "Kasan shadow start"},
    @@ -68,6 +77,28 @@ static struct addr_marker address_markers[] = {
    {-1, NULL},
    };

    +static struct ptd_mm_info kernel_ptd_info = {
    + .mm = &init_mm,
    + .markers = address_markers,
    + .base_addr = KERN_VIRT_START,
    + .end = ULONG_MAX,
    +};
    +
    +#ifdef CONFIG_EFI
    +static struct addr_marker efi_addr_markers[] = {
    + { 0, "UEFI runtime start" },
    + { SZ_1G, "UEFI runtime end" },
    + { -1, NULL }
    +};
    +
    +static struct ptd_mm_info efi_ptd_info = {
    + .mm = &efi_mm,
    + .markers = efi_addr_markers,
    + .base_addr = 0,
    + .end = SZ_2G,
    +};
    +#endif
    +
    /* Page Table Entry */
    struct prot_bits {
    u64 mask;
    @@ -245,22 +276,22 @@ static void note_page(struct ptdump_state *pt_st, unsigned long addr,
    }
    }

    -static void ptdump_walk(struct seq_file *s)
    +static void ptdump_walk(struct seq_file *s, struct ptd_mm_info *pinfo)
    {
    struct pg_state st = {
    .seq = s,
    - .marker = address_markers,
    + .marker = pinfo->markers,
    .level = -1,
    .ptdump = {
    .note_page = note_page,
    .range = (struct ptdump_range[]) {
    - {KERN_VIRT_START, ULONG_MAX},
    + {pinfo->base_addr, pinfo->end},
    {0, 0}
    }
    }
    };

    - ptdump_walk_pgd(&st.ptdump, &init_mm, NULL);
    + ptdump_walk_pgd(&st.ptdump, pinfo->mm, NULL);
    }

    void ptdump_check_wx(void)
    @@ -293,7 +324,7 @@ void ptdump_check_wx(void)

    static int ptdump_show(struct seq_file *m, void *v)
    {
    - ptdump_walk(m);
    + ptdump_walk(m, m->private);

    return 0;
    }
    @@ -308,8 +339,13 @@ static int ptdump_init(void)
    for (j = 0; j < ARRAY_SIZE(pte_bits); j++)
    pg_level[i].mask |= pte_bits[j].mask;

    - debugfs_create_file("kernel_page_tables", 0400, NULL, NULL,
    + debugfs_create_file("kernel_page_tables", 0400, NULL, &kernel_ptd_info,
    &ptdump_fops);
    +#ifdef CONFIG_EFI
    + if (efi_enabled(EFI_RUNTIME_SERVICES))
    + debugfs_create_file("efi_page_tables", 0400, NULL, &efi_ptd_info,
    + &ptdump_fops);
    +#endif

    return 0;
    }
    --
    2.24.0
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