Commit-ID: b176862fca8625b0a8bee207bca9b611413e5e24
Gitweb: http://git.kernel.org/tip/b176862fca8625b0a8bee207bca9b611413e5e24
Author: Borislav Petkov <bp@xxxxxxx>
AuthorDate: Thu, 18 Feb 2016 21:00:41 +0100
Committer: Ingo Molnar <mingo@xxxxxxxxxx>
CommitDate: Sat, 20 Feb 2016 12:25:45 +0100
x86/mm/ptdump: Remove paravirt_enabled()
is_hypervisor_range() can simply check if the PGD index is
within ffff800000000000 - ffff87ffffffffff which is the range
reserved for a hypervisor. That range is practically an ABI, see
Documentation/x86/x86_64/mm.txt.
Tested-by: Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx> # Under Xen, as PV guest
Signed-off-by: Borislav Petkov <bp@xxxxxxx>
Cc: Andy Lutomirski <luto@xxxxxxxxxxxxxx>
Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Cc: Luis R. Rodriguez <mcgrof@xxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Link: http://lkml.kernel.org/r/1455825641-19585-1-git-send-email-bp@xxxxxxxxx
Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
---
arch/x86/mm/dump_pagetables.c | 11 +++++------
1 file changed, 5 insertions(+), 6 deletions(-)
diff --git a/arch/x86/mm/dump_pagetables.c b/arch/x86/mm/dump_pagetables.c
index 4a6f1d9..99bfb19 100644
--- a/arch/x86/mm/dump_pagetables.c
+++ b/arch/x86/mm/dump_pagetables.c
@@ -358,20 +358,19 @@ static void walk_pud_level(struct seq_file *m, struct pg_state *st, pgd_t addr,
#define pgd_none(a) pud_none(__pud(pgd_val(a)))
#endif
-#ifdef CONFIG_X86_64
static inline bool is_hypervisor_range(int idx)
{
+#ifdef CONFIG_X86_64
/*
* ffff800000000000 - ffff87ffffffffff is reserved for
* the hypervisor.
*/
- return paravirt_enabled() &&
- (idx >= pgd_index(__PAGE_OFFSET) - 16) &&
- (idx < pgd_index(__PAGE_OFFSET));
-}
+ return (idx >= pgd_index(__PAGE_OFFSET) - 16) &&
+ (idx < pgd_index(__PAGE_OFFSET));
#else
-static inline bool is_hypervisor_range(int idx) { return false; }
+ return false;
#endif
+}
static void ptdump_walk_pgd_level_core(struct seq_file *m, pgd_t *pgd,
bool checkwx)
--
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