From: Ingo Molnar <mingo@kernel.org>
To: linux-kernel@vger.kernel.org
Cc: Dave Hansen <dave.hansen@linux.intel.com>,
Andy Lutomirski <luto@amacapital.net>,
Thomas Gleixner <tglx@linutronix.de>,
"H . Peter Anvin" <hpa@zytor.com>,
Peter Zijlstra <peterz@infradead.org>,
Borislav Petkov <bp@alien8.de>,
Linus Torvalds <torvalds@linux-foundation.org>
Subject: [PATCH 39/43] x86/mm/kaiser: Add debugfs file to turn KAISER on/off at runtime
Date: Fri, 24 Nov 2017 10:14:44 +0100 [thread overview]
Message-ID: <20171124091448.7649-40-mingo@kernel.org> (raw)
In-Reply-To: <20171124091448.7649-1-mingo@kernel.org>
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: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Daniel Gruss <daniel.gruss@iaik.tugraz.at>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Kees Cook <keescook@google.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Michael Schwarz <michael.schwarz@iaik.tugraz.at>
Cc: Moritz Lipp <moritz.lipp@iaik.tugraz.at>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Richard Fellner <richard.fellner@student.tugraz.at>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-mm@kvack.org
Link: http://lkml.kernel.org/r/20171123003517.8EAB76E0@viggo.jf.intel.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---
arch/x86/mm/kaiser.c | 48 ++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 48 insertions(+)
diff --git a/arch/x86/mm/kaiser.c b/arch/x86/mm/kaiser.c
index 4665dd724efb..968d5b62d597 100644
--- a/arch/x86/mm/kaiser.c
+++ b/arch/x86/mm/kaiser.c
@@ -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/spinlock.h>
#include <linux/mm.h>
@@ -470,3 +471,50 @@ void kaiser_remove_mapping(unsigned long start, unsigned long size)
*/
__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);
--
2.14.1
next prev parent reply other threads:[~2017-11-24 9:17 UTC|newest]
Thread overview: 79+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-11-24 9:14 [PATCH 00/43] x86 entry-stack and Kaiser series, 2017/11/24 version Ingo Molnar
2017-11-24 9:14 ` [PATCH 01/43] x86/decoder: Add new TEST instruction pattern Ingo Molnar
2017-11-24 10:38 ` Borislav Petkov
2017-12-02 7:39 ` Robert Elliott (Persistent Memory)
2017-11-24 9:14 ` [PATCH 02/43] x86/entry/64: Allocate and enable the SYSENTER stack Ingo Molnar
2017-11-24 9:14 ` [PATCH 03/43] x86/dumpstack: Add get_stack_info() support for " Ingo Molnar
2017-11-24 9:14 ` [PATCH 04/43] x86/gdt: Put per-cpu GDT remaps in ascending order Ingo Molnar
2017-11-24 9:14 ` [PATCH 05/43] x86/fixmap: Generalize the GDT fixmap mechanism Ingo Molnar
2017-11-24 11:00 ` Borislav Petkov
2017-11-24 9:14 ` [PATCH 06/43] x86/kasan/64: Teach KASAN about the cpu_entry_area Ingo Molnar
2017-11-24 9:14 ` [PATCH 07/43] x86/entry: Fix assumptions that the HW TSS is at the beginning of cpu_tss Ingo Molnar
2017-11-24 9:14 ` [PATCH 08/43] x86/dumpstack: Handle stack overflow on all stacks Ingo Molnar
2017-11-24 9:14 ` [PATCH 09/43] x86/entry: Move SYSENTER_stack to the beginning of struct tss_struct Ingo Molnar
2017-11-24 11:44 ` Borislav Petkov
2017-11-24 9:14 ` [PATCH 10/43] x86/entry: Remap the TSS into the cpu entry area Ingo Molnar
2017-11-24 9:14 ` [PATCH 11/43] x86/entry/64: Separate cpu_current_top_of_stack from TSS.sp0 Ingo Molnar
2017-11-24 14:19 ` Borislav Petkov
2017-11-24 9:14 ` [PATCH 12/43] x86/espfix/64: Stop assuming that pt_regs is on the entry stack Ingo Molnar
2017-11-24 9:14 ` [PATCH 13/43] x86/entry/64: Use a percpu trampoline stack for IDT entries Ingo Molnar
2017-11-24 11:27 ` Thomas Gleixner
2017-11-24 9:14 ` [PATCH 14/43] x86/entry/64: Return to userspace from the trampoline stack Ingo Molnar
2017-11-24 13:46 ` Thomas Gleixner
2017-11-24 9:14 ` [PATCH 15/43] x86/entry/64: Create a percpu SYSCALL entry trampoline Ingo Molnar
2017-11-24 13:52 ` Thomas Gleixner
2017-11-24 9:14 ` [PATCH 16/43] x86/irq: Remove an old outdated comment about context tracking races Ingo Molnar
2017-11-24 13:53 ` Thomas Gleixner
2017-11-24 9:14 ` [PATCH 17/43] x86/irq/64: Print the offending IP in the stack overflow warning Ingo Molnar
2017-11-24 14:22 ` Thomas Gleixner
2017-11-24 9:14 ` [PATCH 18/43] x86/entry/64: Move the IST stacks into cpu_entry_area Ingo Molnar
2017-11-24 14:23 ` Thomas Gleixner
2017-11-24 9:14 ` [PATCH 19/43] x86/entry/64: Remove the SYSENTER stack canary Ingo Molnar
2017-11-24 14:23 ` Thomas Gleixner
2017-11-24 9:14 ` [PATCH 20/43] x86/entry: Clean up SYSENTER_stack code Ingo Molnar
2017-11-24 14:24 ` Thomas Gleixner
2017-11-24 9:14 ` [PATCH 21/43] x86/mm/kaiser: Disable global pages by default with KAISER Ingo Molnar
2017-11-24 9:14 ` [PATCH 22/43] x86/mm/kaiser: Prepare assembly for entry/exit CR3 switching Ingo Molnar
2017-11-24 12:05 ` Peter Zijlstra
2017-11-24 12:17 ` Ingo Molnar
2017-11-24 12:45 ` Peter Zijlstra
2017-11-24 13:04 ` Thomas Gleixner
2017-11-24 9:14 ` [PATCH 23/43] x86/mm/kaiser: Introduce user-mapped per-cpu areas Ingo Molnar
2017-11-24 9:14 ` [PATCH 24/43] x86/mm/kaiser: Mark per-cpu data structures required for entry/exit Ingo Molnar
2017-11-24 9:14 ` [PATCH 25/43] x86/mm/kaiser: Unmap kernel from userspace page tables (core patch) Ingo Molnar
2017-11-24 12:13 ` Peter Zijlstra
2017-11-24 13:46 ` Ingo Molnar
2017-11-24 12:16 ` Peter Zijlstra
2017-11-24 16:33 ` Dave Hansen
2017-11-26 15:13 ` Ingo Molnar
2017-11-24 13:30 ` Peter Zijlstra
2017-11-26 15:15 ` Ingo Molnar
2017-11-27 8:59 ` [PATCH] x86/mm/kaiser: Use the other page_table_lock pattern Peter Zijlstra
2017-11-27 8:59 ` [PATCH] mm: Unify page_table_lock allocation pattern Peter Zijlstra
2017-11-24 9:14 ` [PATCH 26/43] x86/mm/kaiser: Allow NX poison to be set in p4d/pgd Ingo Molnar
2017-11-24 9:14 ` [PATCH 27/43] x86/mm/kaiser: Make sure static PGDs are 8k in size Ingo Molnar
2017-11-24 9:14 ` [PATCH 28/43] x86/mm/kaiser: Map CPU entry area Ingo Molnar
2017-11-24 13:43 ` Peter Zijlstra
2017-11-24 9:14 ` [PATCH 29/43] x86/mm/kaiser: Map dynamically-allocated LDTs Ingo Molnar
2017-11-24 9:14 ` [PATCH 30/43] x86/mm/kaiser: Map espfix structures Ingo Molnar
2017-11-24 13:47 ` Peter Zijlstra
2017-11-24 16:17 ` Andy Lutomirski
2017-11-27 9:14 ` Peter Zijlstra
2017-11-27 15:35 ` Peter Zijlstra
2017-11-24 9:14 ` [PATCH 31/43] x86/mm/kaiser: Map entry stack variable Ingo Molnar
2017-11-24 9:14 ` [PATCH 32/43] x86/mm/kaiser: Map virtually-addressed performance monitoring buffers Ingo Molnar
2017-11-24 9:14 ` [PATCH 33/43] x86/mm: Move CR3 construction functions Ingo Molnar
2017-11-24 9:14 ` [PATCH 34/43] x86/mm: Remove hard-coded ASID limit checks Ingo Molnar
2017-11-24 9:14 ` [PATCH 35/43] x86/mm: Put mmu-to-h/w ASID translation in one place Ingo Molnar
2017-11-24 9:14 ` [PATCH 36/43] x86/mm: Allow flushing for future ASID switches Ingo Molnar
2017-11-24 9:14 ` [PATCH 37/43] x86/mm/kaiser: Use PCID feature to make user and kernel switches faster Ingo Molnar
2017-11-24 9:14 ` [PATCH 38/43] x86/mm/kaiser: Disable native VSYSCALL Ingo Molnar
2017-11-24 9:14 ` Ingo Molnar [this message]
2017-11-24 9:14 ` [PATCH 40/43] x86/mm/kaiser: Add a function to check for KAISER being enabled Ingo Molnar
2017-11-24 9:14 ` [PATCH 41/43] x86/mm/kaiser: Un-poison PGDs at runtime Ingo Molnar
2017-11-24 9:14 ` [PATCH 42/43] x86/mm/kaiser: Allow KAISER to be enabled/disabled " Ingo Molnar
2017-11-24 9:14 ` [PATCH 43/43] x86/mm/kaiser: Add Kconfig Ingo Molnar
2017-11-24 13:55 ` [PATCH 00/43] x86 entry-stack and Kaiser series, 2017/11/24 version Ingo Molnar
2017-11-24 15:23 ` Thomas Gleixner
2017-11-24 17:19 ` Ingo Molnar
2017-11-24 17:23 [PATCH 00/43] x86 entry-stack and Kaiser series, 2017/11/24, v2 version Ingo Molnar
2017-11-24 17:24 ` [PATCH 39/43] x86/mm/kaiser: Add debugfs file to turn KAISER on/off at runtime Ingo Molnar
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