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Subject[tip: x86/urgent] x86/mm: Fix dump_pagetables with Xen PV
The following commit has been merged into the x86/urgent branch of tip:

Commit-ID: bba42affa732d6fd5bd5c9678e6deacde2de1547
Gitweb: https://git.kernel.org/tip/bba42affa732d6fd5bd5c9678e6deacde2de1547
Author: Juergen Gross <jgross@suse.com>
AuthorDate: Fri, 21 Feb 2020 11:38:51 +01:00
Committer: Thomas Gleixner <tglx@linutronix.de>
CommitterDate: Sat, 29 Feb 2020 12:43:10 +01:00

x86/mm: Fix dump_pagetables with Xen PV

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@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

---
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 64229da..69309cd 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
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