Commit b176862f authored Feb 18, 2016 by Borislav Petkov Committed by Ingo Molnar Feb 20, 2016

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@oracle.com> # Under Xen, as PV guest
Signed-off-by: Borislav Petkov <bp@suse.de>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Luis R. Rodriguez <mcgrof@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/1455825641-19585-1-git-send-email-bp@alien8.de


Signed-off-by: Ingo Molnar <mingo@kernel.org>

parent e2c7698c

arch/x86/mm/dump_pagetables.c

+5 −6

Original line number	Diff line number	Diff line
		@@ -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) &&
		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)