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x86/mm: Fix dump_pagetables with Xen PV

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Commit 2ae27137b2 ("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: 2ae27137b2 ("x86: mm: convert dump_pagetables to use walk_page_range")
Reported-by: Julien Grall <julien@xen.org>
Signed-off-by: Juergen Gross <jgross@suse.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Tested-by: Julien Grall <julien@xen.org>
Link: https://lkml.kernel.org/r/20200221103851.7855-1-jgross@suse.com
This commit is contained in:
Juergen Gross 2020-02-21 11:38:51 +01:00 • committed by Thomas Gleixner
parent 99bcd4a6e5
commit bba42affa7
1 changed files with 1 additions and 6 deletions
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7
arch/x86/mm/dump_pagetables.c
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@ -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