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 25/30] x86, kaiser: add debugfs file to turn KAISER on/off at runtime
Date: Fri, 10 Nov 2017 11:31:53 -0800 [thread overview]
Message-ID: <20171110193153.D45596C9@viggo.jf.intel.com> (raw)
In-Reply-To: <20171110193058.BECA7D88@viggo.jf.intel.com>
From: Dave Hansen <dave.hansen@linux.intel.com>
This will be used in a few patches. Right now, it's not wired up
to do anything useful.
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/mm/kaiser.c | 48 ++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 48 insertions(+)
diff -puN arch/x86/mm/kaiser.c~kaiser-dynamic-debugfs arch/x86/mm/kaiser.c
--- a/arch/x86/mm/kaiser.c~kaiser-dynamic-debugfs 2017-11-10 11:22:18.900244925 -0800
+++ b/arch/x86/mm/kaiser.c 2017-11-10 11:22:18.904244925 -0800
@@ -29,6 +29,7 @@
#include <linux/string.h>
#include <linux/types.h>
#include <linux/bug.h>
+#include <linux/debugfs.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/spinlock.h>
@@ -457,3 +458,50 @@ void kaiser_remove_mapping(unsigned long
*/
__native_flush_tlb_global();
}
+
+int kaiser_enabled = 1;
+static ssize_t kaiser_enabled_read_file(struct file *file, char __user *user_buf,
+ size_t count, loff_t *ppos)
+{
+ char buf[32];
+ unsigned int len;
+
+ len = sprintf(buf, "%d\n", kaiser_enabled);
+ return simple_read_from_buffer(user_buf, count, ppos, buf, len);
+}
+
+static ssize_t kaiser_enabled_write_file(struct file *file,
+ const char __user *user_buf, size_t count, loff_t *ppos)
+{
+ char buf[32];
+ ssize_t len;
+ unsigned int enable;
+
+ len = min(count, sizeof(buf) - 1);
+ if (copy_from_user(buf, user_buf, len))
+ return -EFAULT;
+
+ buf[len] = '\0';
+ if (kstrtoint(buf, 0, &enable))
+ return -EINVAL;
+
+ if (enable > 1)
+ return -EINVAL;
+
+ WRITE_ONCE(kaiser_enabled, enable);
+ return count;
+}
+
+static const struct file_operations fops_kaiser_enabled = {
+ .read = kaiser_enabled_read_file,
+ .write = kaiser_enabled_write_file,
+ .llseek = default_llseek,
+};
+
+static int __init create_kaiser_enabled(void)
+{
+ debugfs_create_file("kaiser-enabled", S_IRUSR | S_IWUSR,
+ arch_debugfs_dir, NULL, &fops_kaiser_enabled);
+ return 0;
+}
+late_initcall(create_kaiser_enabled);
_
--
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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 ` Dave Hansen [this message]
2017-11-10 19:31 ` [PATCH 26/30] x86, kaiser: add a function to check for KAISER being enabled Dave Hansen
2017-11-10 19:31 ` [PATCH 27/30] x86, kaiser: un-poison PGDs at runtime 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 25/30] x86, kaiser: add debugfs file to turn KAISER on/off at runtime Dave Hansen
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