[Xen-devel] [PATCH] x86/mm: fix dump_pagetables with Xen PV

[Juergen Gross <jgross@xxxxxxxx>]

Commit 2ae27137b2db89 ("x86: mm: convert dump_pagetables to use
walk_page_range") broke Xen PV guests as the hypervisor reserved hole
in the memory map was not taken into account.

Fix that by starting the kernel range only at GUARD_HOLE_END_ADDR.

Fixes: 2ae27137b2db89 ("x86: mm: convert dump_pagetables to use 
walk_page_range")
Reported-by: Julien Grall <julien@xxxxxxx>
Signed-off-by: Juergen Gross <jgross@xxxxxxxx>
---
 arch/x86/mm/dump_pagetables.c | 7 +------
 1 file changed, 1 insertion(+), 6 deletions(-)

diff --git a/arch/x86/mm/dump_pagetables.c b/arch/x86/mm/dump_pagetables.c
index 64229dad7eab..69309cd56fdf 100644
--- a/arch/x86/mm/dump_pagetables.c
+++ b/arch/x86/mm/dump_pagetables.c
@@ -363,13 +363,8 @@ static void ptdump_walk_pgd_level_core(struct seq_file *m,
 {
        const struct ptdump_range ptdump_ranges[] = {
 #ifdef CONFIG_X86_64
-
-#define normalize_addr_shift (64 - (__VIRTUAL_MASK_SHIFT + 1))
-#define normalize_addr(u) ((signed long)((u) << normalize_addr_shift) >> \
-                          normalize_addr_shift)
-
        {0, PTRS_PER_PGD * PGD_LEVEL_MULT / 2},
-       {normalize_addr(PTRS_PER_PGD * PGD_LEVEL_MULT / 2), ~0UL},
+       {GUARD_HOLE_END_ADDR, ~0UL},
 #else
        {0, ~0UL},
 #endif
-- 
2.16.4


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