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Date: Thu, 18 Feb 2016 21:00:41 +0100 From: Borislav Petkov <bp@...en8.de> To: X86 ML <x86@...nel.org> Cc: LKML <linux-kernel@...r.kernel.org>, Andy Lutomirski <luto@...capital.net>, Boris Ostrovsky <boris.ostrovsky@...cle.com>, "Luis R. Rodriguez" <mcgrof@...nel.org> Subject: [PATCH] x86/ptdump: Remove paravirt_enabled() From: Borislav Petkov <bp@...e.de> 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. Signed-off-by: Borislav Petkov <bp@...e.de> Cc: Andy Lutomirski <luto@...capital.net> Cc: Boris Ostrovsky <boris.ostrovsky@...cle.com> Cc: "Luis R. Rodriguez" <mcgrof@...nel.org> --- 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 4a6f1d9b5106..99bfb192803f 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) -- 2.3.5
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