From: Dave Hansen <dave.hansen@linux.intel.com>
To: linux-kernel@vger.kernel.org
Cc: linux-mm@kvack.org, dave.hansen@linux.intel.com,
moritz.lipp@iaik.tugraz.at, daniel.gruss@iaik.tugraz.at,
michael.schwarz@iaik.tugraz.at,
richard.fellner@student.tugraz.at, luto@kernel.org,
torvalds@linux-foundation.org, keescook@google.com,
hughd@google.com, x86@kernel.org
Subject: [PATCH 26/30] x86, kaiser: add a function to check for KAISER being enabled
Date: Fri, 10 Nov 2017 11:31:55 -0800 [thread overview]
Message-ID: <20171110193155.D088AF1D@viggo.jf.intel.com> (raw)
In-Reply-To: <20171110193058.BECA7D88@viggo.jf.intel.com>
From: Dave Hansen <dave.hansen@linux.intel.com>
Currently, all of the checks for KAISER are compile-time checks.
Runtime checks are needed for turning it on/off at runtime.
Add a function to do that.
Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Moritz Lipp <moritz.lipp@iaik.tugraz.at>
Cc: Daniel Gruss <daniel.gruss@iaik.tugraz.at>
Cc: Michael Schwarz <michael.schwarz@iaik.tugraz.at>
Cc: Richard Fellner <richard.fellner@student.tugraz.at>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Kees Cook <keescook@google.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: x86@kernel.org
---
b/arch/x86/include/asm/kaiser.h | 5 +++++
b/include/linux/kaiser.h | 4 ++++
2 files changed, 9 insertions(+)
diff -puN arch/x86/include/asm/kaiser.h~kaiser-dynamic-check-func arch/x86/include/asm/kaiser.h
--- a/arch/x86/include/asm/kaiser.h~kaiser-dynamic-check-func 2017-11-10 11:22:19.435244924 -0800
+++ b/arch/x86/include/asm/kaiser.h 2017-11-10 11:22:19.440244924 -0800
@@ -50,6 +50,11 @@ extern void kaiser_remove_mapping(unsign
*/
extern void kaiser_init(void);
+static inline bool kaiser_active(void)
+{
+ extern int kaiser_enabled;
+ return kaiser_enabled;
+}
#endif
#endif /* __ASSEMBLY__ */
diff -puN include/linux/kaiser.h~kaiser-dynamic-check-func include/linux/kaiser.h
--- a/include/linux/kaiser.h~kaiser-dynamic-check-func 2017-11-10 11:22:19.437244924 -0800
+++ b/include/linux/kaiser.h 2017-11-10 11:22:19.440244924 -0800
@@ -25,5 +25,9 @@ static inline int kaiser_add_mapping(uns
return 0;
}
+static inline bool kaiser_active(void)
+{
+ return 0;
+}
#endif /* !CONFIG_KAISER */
#endif /* _INCLUDE_KAISER_H */
_
--
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next prev parent reply other threads:[~2017-11-10 19:32 UTC|newest]
Thread overview: 76+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-11-10 19:30 [PATCH 00/30] [v3] KAISER: unmap most of the kernel from userspace page tables Dave Hansen
2017-11-10 19:31 ` [PATCH 01/30] x86, mm: do not set _PAGE_USER for init_mm " Dave Hansen
2017-11-10 19:31 ` [PATCH 02/30] x86, tlb: Make CR4-based TLB flushes more robust Dave Hansen
2017-11-10 19:31 ` [PATCH 03/30] x86/mm: Document X86_CR4_PGE toggling behavior Dave Hansen
2017-11-10 19:31 ` [PATCH 04/30] x86, kaiser: disable global pages by default with KAISER Dave Hansen
2017-11-14 19:38 ` Rik van Riel
2017-11-26 14:48 ` Ingo Molnar
2017-11-27 11:37 ` Thomas Gleixner
2017-11-27 13:20 ` [PATCH v2] x86/mm/kaiser: Disable " Ingo Molnar
2017-11-27 13:23 ` Thomas Gleixner
2017-11-27 13:27 ` Ingo Molnar
2017-11-10 19:31 ` [PATCH 05/30] x86, kaiser: prepare assembly for entry/exit CR3 switching Dave Hansen
2017-11-20 12:17 ` Thomas Gleixner
2017-11-10 19:31 ` [PATCH 06/30] x86, kaiser: introduce user-mapped per-cpu areas Dave Hansen
2017-11-10 19:31 ` [PATCH 07/30] x86, kaiser: mark per-cpu data structures required for entry/exit Dave Hansen
2017-11-10 19:31 ` [PATCH 08/30] x86, kaiser: unmap kernel from userspace page tables (core patch) Dave Hansen
2017-11-20 17:21 ` Thomas Gleixner
2017-11-22 22:45 ` Dave Hansen
2017-11-22 22:50 ` Dave Hansen
2017-11-22 22:54 ` Dave Hansen
2017-11-22 23:11 ` Dave Hansen
2017-11-10 19:31 ` [PATCH 09/30] x86, kaiser: only populate shadow page tables for userspace Dave Hansen
2017-11-20 20:12 ` Thomas Gleixner
2017-11-21 7:05 ` Ingo Molnar
2017-11-21 22:09 ` Dave Hansen
2017-11-22 3:44 ` Andy Lutomirski
2017-11-22 23:30 ` Dave Hansen
2017-11-10 19:31 ` [PATCH 10/30] x86, kaiser: allow NX poison to be set in p4d/pgd Dave Hansen
2017-11-10 19:31 ` [PATCH 11/30] x86, kaiser: make sure static PGDs are 8k in size Dave Hansen
2017-11-10 19:31 ` [PATCH 12/30] x86, kaiser: map GDT into user page tables Dave Hansen
2017-11-20 20:22 ` Thomas Gleixner
2017-11-20 20:46 ` Andy Lutomirski
2017-11-20 20:55 ` Thomas Gleixner
2017-11-21 21:19 ` Dave Hansen
2017-11-21 22:46 ` Andy Lutomirski
2017-11-21 23:17 ` Dave Hansen
2017-11-21 23:32 ` Andy Lutomirski
2017-11-21 23:42 ` Dave Hansen
2017-11-22 0:17 ` Andy Lutomirski
2017-11-22 0:37 ` Dave Hansen
2017-11-21 22:12 ` Dave Hansen
2017-11-10 19:31 ` [PATCH 13/30] x86, kaiser: map dynamically-allocated LDTs Dave Hansen
2017-11-10 19:31 ` [PATCH 14/30] x86, kaiser: map espfix structures Dave Hansen
2017-11-10 19:31 ` [PATCH 15/30] x86, kaiser: map entry stack variables Dave Hansen
2017-11-10 19:31 ` [PATCH 16/30] x86, kaiser: map trace interrupt entry Dave Hansen
2017-11-10 19:31 ` [PATCH 17/30] x86, kaiser: map debug IDT tables Dave Hansen
2017-11-20 20:40 ` Thomas Gleixner
2017-11-21 22:16 ` Dave Hansen
2017-11-20 20:44 ` Andy Lutomirski
2017-11-20 20:54 ` Thomas Gleixner
2017-11-10 19:31 ` [PATCH 18/30] x86, kaiser: map virtually-addressed performance monitoring buffers Dave Hansen
2017-11-14 18:20 ` Peter Zijlstra
2017-11-14 18:28 ` Dave Hansen
2017-11-14 19:10 ` Hugh Dickins
2017-11-14 19:24 ` Andy Lutomirski
2017-11-15 9:41 ` Peter Zijlstra
2017-11-10 19:31 ` [PATCH 19/30] x86, mm: Move CR3 construction functions Dave Hansen
2017-11-10 19:31 ` [PATCH 20/30] x86, mm: remove hard-coded ASID limit checks Dave Hansen
2017-11-20 20:47 ` Thomas Gleixner
2017-11-10 19:31 ` [PATCH 21/30] x86, mm: put mmu-to-h/w ASID translation in one place Dave Hansen
2017-11-10 22:03 ` Andy Lutomirski
2017-11-10 22:09 ` Dave Hansen
2017-11-10 22:10 ` Andy Lutomirski
2017-11-10 19:31 ` [PATCH 22/30] x86, pcid, kaiser: allow flushing for future ASID switches Dave Hansen
2017-11-10 19:31 ` [PATCH 23/30] x86, kaiser: use PCID feature to make user and kernel switches faster Dave Hansen
2017-11-16 19:19 ` Andrea Arcangeli
2017-11-16 19:25 ` Dave Hansen
2017-11-10 19:31 ` [PATCH 24/30] x86, kaiser: disable native VSYSCALL Dave Hansen
2017-11-10 19:31 ` [PATCH 25/30] x86, kaiser: add debugfs file to turn KAISER on/off at runtime Dave Hansen
2017-11-10 19:31 ` Dave Hansen [this message]
2017-11-10 19:31 ` [PATCH 27/30] x86, kaiser: un-poison PGDs " Dave Hansen
2017-11-10 19:31 ` [PATCH 28/30] x86, kaiser: allow KAISER to be enabled/disabled " Dave Hansen
2017-11-10 19:32 ` [PATCH 29/30] x86, kaiser: add Kconfig Dave Hansen
2017-11-10 19:32 ` [PATCH 30/30] x86, kaiser, xen: Dynamically disable KAISER when running under Xen PV Dave Hansen
2017-11-20 16:02 ` [PATCH 00/30] [v3] KAISER: unmap most of the kernel from userspace page tables Juerg Haefliger
-- strict thread matches above, loose matches on Subject: below --
2017-11-08 19:46 [PATCH 00/30] [v2] " Dave Hansen
2017-11-08 19:47 ` [PATCH 26/30] x86, kaiser: add a function to check for KAISER being enabled Dave Hansen
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