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From: Thomas Gleixner <tglx@linutronix.de>
To: LKML <linux-kernel@vger.kernel.org>
Cc: Dave Hansen <dave.hansen@linux.intel.com>,
	Andy Lutomirski <luto@kernel.org>, Ingo Molnar <mingo@kernel.org>,
	Borislav Petkov <bp@alien8.de>, Brian Gerst <brgerst@gmail.com>,
	Denys Vlasenko <dvlasenk@redhat.com>,
	"H. Peter Anvin" <hpa@zytor.com>,
	Josh Poimboeuf <jpoimboe@redhat.com>,
	Linus Torvalds <torvalds@linux-foundation.org>,
	Peter Zijlstra <peterz@infradead.org>,
	Rik van Riel <riel@redhat.com>,
	daniel.gruss@iaik.tugraz.at, hughd@google.com,
	keescook@google.com, linux-mm@kvack.org,
	michael.schwarz@iaik.tugraz.at, moritz.lipp@iaik.tugraz.at,
	richard.fellner@student.tugraz.at
Subject: [patch V2 5/5] x86/kaiser: Add boottime disable switch
Date: Mon, 27 Nov 2017 00:14:08 +0100	[thread overview]
Message-ID: <20171126232414.645128754@linutronix.de> (raw)
In-Reply-To: 20171126231403.657575796@linutronix.de

[-- Attachment #1: x86-kaiser--Add-boottime-disable-switch.patch --]
[-- Type: text/plain, Size: 6942 bytes --]

KAISER comes with overhead. The most expensive part is the CR3 switching in
the entry code.

Add a command line parameter which allows to disable KAISER at boot time.

Most code pathes simply check a variable, but the entry code uses a static
branch. The other code pathes cannot use a static branch because they are
used before jump label patching is possible. Not an issue as the code
pathes are not so performance sensitive as the entry/exit code.

This makes KAISER depend on JUMP_LABEL and on a GCC which supports
it, but that's a resonable requirement.

The PGD allocation is still 8k when CONFIG_KAISER is enabled. This can be
addressed on top of this.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
---
 arch/x86/entry/calling.h          |    7 +++++++
 arch/x86/include/asm/kaiser.h     |   10 ++++++++++
 arch/x86/include/asm/pgtable_64.h |    6 ++++++
 arch/x86/mm/dump_pagetables.c     |    5 ++++-
 arch/x86/mm/init.c                |    7 ++++---
 arch/x86/mm/kaiser.c              |   30 ++++++++++++++++++++++++++++++
 security/Kconfig                  |    2 +-
 7 files changed, 62 insertions(+), 5 deletions(-)

--- a/arch/x86/entry/calling.h
+++ b/arch/x86/entry/calling.h
@@ -210,18 +210,23 @@ For 32-bit we have the following convent
 .endm
 
 .macro SWITCH_TO_KERNEL_CR3 scratch_reg:req
+	STATIC_JUMP_IF_FALSE .Lend_\@, kaiser_enabled_key, def=1
 	mov	%cr3, \scratch_reg
 	ADJUST_KERNEL_CR3 \scratch_reg
 	mov	\scratch_reg, %cr3
+.Lend_\@:
 .endm
 
 .macro SWITCH_TO_USER_CR3 scratch_reg:req
+	STATIC_JUMP_IF_FALSE .Lend_\@, kaiser_enabled_key, def=1
 	mov	%cr3, \scratch_reg
 	ADJUST_USER_CR3 \scratch_reg
 	mov	\scratch_reg, %cr3
+.Lend_\@:
 .endm
 
 .macro SAVE_AND_SWITCH_TO_KERNEL_CR3 scratch_reg:req save_reg:req
+	STATIC_JUMP_IF_FALSE .Ldone_\@, kaiser_enabled_key, def=1
 	movq	%cr3, %r\scratch_reg
 	movq	%r\scratch_reg, \save_reg
 	/*
@@ -244,11 +249,13 @@ For 32-bit we have the following convent
 .endm
 
 .macro RESTORE_CR3 save_reg:req
+	STATIC_JUMP_IF_FALSE .Lend_\@, kaiser_enabled_key, def=1
 	/*
 	 * The CR3 write could be avoided when not changing its value,
 	 * but would require a CR3 read *and* a scratch register.
 	 */
 	movq	\save_reg, %cr3
+.Lend_\@:
 .endm
 
 #else /* CONFIG_KAISER=n: */
--- a/arch/x86/include/asm/kaiser.h
+++ b/arch/x86/include/asm/kaiser.h
@@ -56,6 +56,16 @@ extern void kaiser_remove_mapping(unsign
  */
 extern void kaiser_init(void);
 
+/* True if kaiser is enabled at boot time */
+extern struct static_key_true kaiser_enabled_key;
+extern bool kaiser_enabled;
+extern void kaiser_check_cmdline(void);
+
+#else /* CONFIG_KAISER */
+
+#define kaiser_enabled		(false)
+static inline void kaiser_check_cmdline(void) { }
+
 #endif
 
 #endif /* __ASSEMBLY__ */
--- a/arch/x86/include/asm/pgtable_64.h
+++ b/arch/x86/include/asm/pgtable_64.h
@@ -175,6 +175,9 @@ static inline p4d_t *shadow_to_kernel_p4
 {
 	return ptr_clear_bit(p4dp, KAISER_PGTABLE_SWITCH_BIT);
 }
+
+extern bool kaiser_enabled;
+
 #endif /* CONFIG_KAISER */
 
 /*
@@ -208,6 +211,9 @@ static inline bool pgd_userspace_access(
 static inline pgd_t kaiser_set_shadow_pgd(pgd_t *pgdp, pgd_t pgd)
 {
 #ifdef CONFIG_KAISER
+	if (!kaiser_enabled)
+		return pgd;
+
 	if (pgd_userspace_access(pgd)) {
 		if (pgdp_maps_userspace(pgdp)) {
 			/*
--- a/arch/x86/mm/dump_pagetables.c
+++ b/arch/x86/mm/dump_pagetables.c
@@ -20,6 +20,7 @@
 #include <linux/seq_file.h>
 
 #include <asm/pgtable.h>
+#include <asm/kaiser.h>
 
 /*
  * The dumper groups pagetable entries of the same type into one, and for
@@ -503,7 +504,7 @@ void ptdump_walk_pgd_level(struct seq_fi
 
 void ptdump_walk_pgd_level_debugfs(struct seq_file *m, pgd_t *pgd, bool shadow)
 {
-	if (shadow)
+	if (shadow && kaiser_enabled)
 		pgd += PTRS_PER_PGD;
 	ptdump_walk_pgd_level_core(m, pgd, false, false);
 }
@@ -514,6 +515,8 @@ void ptdump_walk_shadow_pgd_level_checkw
 #ifdef CONFIG_KAISER
 	pgd_t *pgd = (pgd_t *) &init_top_pgt;
 
+	if (!kaiser_enabled)
+		return;
 	pr_info("x86/mm: Checking shadow page tables\n");
 	pgd += PTRS_PER_PGD;
 	ptdump_walk_pgd_level_core(NULL, pgd, true, false);
--- a/arch/x86/mm/init.c
+++ b/arch/x86/mm/init.c
@@ -20,6 +20,7 @@
 #include <asm/kaslr.h>
 #include <asm/hypervisor.h>
 #include <asm/cpufeature.h>
+#include <asm/kaiser.h>
 
 /*
  * We need to define the tracepoints somewhere, and tlb.c
@@ -163,9 +164,8 @@ static int page_size_mask;
 
 static void enable_global_pages(void)
 {
-#ifndef CONFIG_KAISER
-	__supported_pte_mask |= _PAGE_GLOBAL;
-#endif
+	if (!kaiser_enabled)
+		__supported_pte_mask |= _PAGE_GLOBAL;
 }
 
 static void __init probe_page_size_mask(void)
@@ -656,6 +656,7 @@ void __init init_mem_mapping(void)
 {
 	unsigned long end;
 
+	kaiser_check_cmdline();
 	probe_page_size_mask();
 	setup_pcid();
 
--- a/arch/x86/mm/kaiser.c
+++ b/arch/x86/mm/kaiser.c
@@ -34,6 +34,7 @@
 #include <linux/mm.h>
 #include <linux/uaccess.h>
 
+#include <asm/cmdline.h>
 #include <asm/kaiser.h>
 #include <asm/pgtable.h>
 #include <asm/pgalloc.h>
@@ -44,6 +45,16 @@
 
 static pteval_t kaiser_pte_mask __ro_after_init = ~(_PAGE_NX | _PAGE_GLOBAL);
 
+/* Global flag for boot time kaiser enable/disable */
+bool kaiser_enabled __ro_after_init = true;
+DEFINE_STATIC_KEY_TRUE(kaiser_enabled_key);
+
+void __init kaiser_check_cmdline(void)
+{
+	if (cmdline_find_option_bool(boot_command_line, "nokaiser"))
+		kaiser_enabled = false;
+}
+
 /*
  * At runtime, the only things we map are some things for CPU
  * hotplug, and stacks for new processes.  No two CPUs will ever
@@ -252,6 +263,9 @@ int kaiser_add_user_map(const void *__st
 	unsigned long target_address;
 	pte_t *pte;
 
+	if (!kaiser_enabled)
+		return 0;
+
 	/* Clear not supported bits */
 	flags &= kaiser_pte_mask;
 
@@ -402,6 +416,9 @@ void __init kaiser_init(void)
 {
 	int cpu;
 
+	if (!kaiser_enabled)
+		return;
+
 	kaiser_init_all_pgds();
 
 	for_each_possible_cpu(cpu) {
@@ -436,6 +453,16 @@ void __init kaiser_init(void)
 	kaiser_add_mapping_cpu_entry(0);
 }
 
+static int __init kaiser_boottime_control(void)
+{
+	if (!kaiser_enabled) {
+		static_branch_disable(&kaiser_enabled_key);
+		pr_info("kaiser: Disabled on command line\n");
+	}
+	return 0;
+}
+subsys_initcall(kaiser_boottime_control);
+
 int kaiser_add_mapping(unsigned long addr, unsigned long size,
 		       unsigned long flags)
 {
@@ -446,6 +473,9 @@ void kaiser_remove_mapping(unsigned long
 {
 	unsigned long addr;
 
+	if (!kaiser_enabled)
+		return;
+
 	/* The shadow page tables always use small pages: */
 	for (addr = start; addr < start + size; addr += PAGE_SIZE) {
 		/*
--- a/security/Kconfig
+++ b/security/Kconfig
@@ -56,7 +56,7 @@ config SECURITY_NETWORK
 
 config KAISER
 	bool "Remove the kernel mapping in user mode"
-	depends on X86_64 && SMP && !PARAVIRT
+	depends on X86_64 && SMP && !PARAVIRT && JUMP_LABEL
 	help
 	  This feature reduces the number of hardware side channels by
 	  ensuring that the majority of kernel addresses are not mapped

WARNING: multiple messages have this Message-ID
From: Thomas Gleixner <tglx@linutronix.de>
To: LKML <linux-kernel@vger.kernel.org>
Cc: Dave Hansen <dave.hansen@linux.intel.com>,
	Andy Lutomirski <luto@kernel.org>, Ingo Molnar <mingo@kernel.org>,
	Borislav Petkov <bp@alien8.de>, Brian Gerst <brgerst@gmail.com>,
	Denys Vlasenko <dvlasenk@redhat.com>,
	"H. Peter Anvin" <hpa@zytor.com>,
	Josh Poimboeuf <jpoimboe@redhat.com>,
	Linus Torvalds <torvalds@linux-foundation.org>,
	Peter Zijlstra <peterz@infradead.org>,
	Rik van Riel <riel@redhat.com>,
	daniel.gruss@iaik.tugraz.at, hughd@google.com,
	keescook@google.com, linux-mm@kvack.org,
	michael.schwarz@iaik.tugraz.at, moritz.lipp@iaik.tugraz.at,
	richard.fellner@student.tugraz.at
Subject: [patch V2 5/5] x86/kaiser: Add boottime disable switch
Date: Mon, 27 Nov 2017 00:14:08 +0100	[thread overview]
Message-ID: <20171126232414.645128754@linutronix.de> (raw)
In-Reply-To: 20171126231403.657575796@linutronix.de

[-- Attachment #1: x86-kaiser--Add-boottime-disable-switch.patch --]
[-- Type: text/plain, Size: 7169 bytes --]

KAISER comes with overhead. The most expensive part is the CR3 switching in
the entry code.

Add a command line parameter which allows to disable KAISER at boot time.

Most code pathes simply check a variable, but the entry code uses a static
branch. The other code pathes cannot use a static branch because they are
used before jump label patching is possible. Not an issue as the code
pathes are not so performance sensitive as the entry/exit code.

This makes KAISER depend on JUMP_LABEL and on a GCC which supports
it, but that's a resonable requirement.

The PGD allocation is still 8k when CONFIG_KAISER is enabled. This can be
addressed on top of this.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
---
 arch/x86/entry/calling.h          |    7 +++++++
 arch/x86/include/asm/kaiser.h     |   10 ++++++++++
 arch/x86/include/asm/pgtable_64.h |    6 ++++++
 arch/x86/mm/dump_pagetables.c     |    5 ++++-
 arch/x86/mm/init.c                |    7 ++++---
 arch/x86/mm/kaiser.c              |   30 ++++++++++++++++++++++++++++++
 security/Kconfig                  |    2 +-
 7 files changed, 62 insertions(+), 5 deletions(-)

--- a/arch/x86/entry/calling.h
+++ b/arch/x86/entry/calling.h
@@ -210,18 +210,23 @@ For 32-bit we have the following convent
 .endm
 
 .macro SWITCH_TO_KERNEL_CR3 scratch_reg:req
+	STATIC_JUMP_IF_FALSE .Lend_\@, kaiser_enabled_key, def=1
 	mov	%cr3, \scratch_reg
 	ADJUST_KERNEL_CR3 \scratch_reg
 	mov	\scratch_reg, %cr3
+.Lend_\@:
 .endm
 
 .macro SWITCH_TO_USER_CR3 scratch_reg:req
+	STATIC_JUMP_IF_FALSE .Lend_\@, kaiser_enabled_key, def=1
 	mov	%cr3, \scratch_reg
 	ADJUST_USER_CR3 \scratch_reg
 	mov	\scratch_reg, %cr3
+.Lend_\@:
 .endm
 
 .macro SAVE_AND_SWITCH_TO_KERNEL_CR3 scratch_reg:req save_reg:req
+	STATIC_JUMP_IF_FALSE .Ldone_\@, kaiser_enabled_key, def=1
 	movq	%cr3, %r\scratch_reg
 	movq	%r\scratch_reg, \save_reg
 	/*
@@ -244,11 +249,13 @@ For 32-bit we have the following convent
 .endm
 
 .macro RESTORE_CR3 save_reg:req
+	STATIC_JUMP_IF_FALSE .Lend_\@, kaiser_enabled_key, def=1
 	/*
 	 * The CR3 write could be avoided when not changing its value,
 	 * but would require a CR3 read *and* a scratch register.
 	 */
 	movq	\save_reg, %cr3
+.Lend_\@:
 .endm
 
 #else /* CONFIG_KAISER=n: */
--- a/arch/x86/include/asm/kaiser.h
+++ b/arch/x86/include/asm/kaiser.h
@@ -56,6 +56,16 @@ extern void kaiser_remove_mapping(unsign
  */
 extern void kaiser_init(void);
 
+/* True if kaiser is enabled at boot time */
+extern struct static_key_true kaiser_enabled_key;
+extern bool kaiser_enabled;
+extern void kaiser_check_cmdline(void);
+
+#else /* CONFIG_KAISER */
+
+#define kaiser_enabled		(false)
+static inline void kaiser_check_cmdline(void) { }
+
 #endif
 
 #endif /* __ASSEMBLY__ */
--- a/arch/x86/include/asm/pgtable_64.h
+++ b/arch/x86/include/asm/pgtable_64.h
@@ -175,6 +175,9 @@ static inline p4d_t *shadow_to_kernel_p4
 {
 	return ptr_clear_bit(p4dp, KAISER_PGTABLE_SWITCH_BIT);
 }
+
+extern bool kaiser_enabled;
+
 #endif /* CONFIG_KAISER */
 
 /*
@@ -208,6 +211,9 @@ static inline bool pgd_userspace_access(
 static inline pgd_t kaiser_set_shadow_pgd(pgd_t *pgdp, pgd_t pgd)
 {
 #ifdef CONFIG_KAISER
+	if (!kaiser_enabled)
+		return pgd;
+
 	if (pgd_userspace_access(pgd)) {
 		if (pgdp_maps_userspace(pgdp)) {
 			/*
--- a/arch/x86/mm/dump_pagetables.c
+++ b/arch/x86/mm/dump_pagetables.c
@@ -20,6 +20,7 @@
 #include <linux/seq_file.h>
 
 #include <asm/pgtable.h>
+#include <asm/kaiser.h>
 
 /*
  * The dumper groups pagetable entries of the same type into one, and for
@@ -503,7 +504,7 @@ void ptdump_walk_pgd_level(struct seq_fi
 
 void ptdump_walk_pgd_level_debugfs(struct seq_file *m, pgd_t *pgd, bool shadow)
 {
-	if (shadow)
+	if (shadow && kaiser_enabled)
 		pgd += PTRS_PER_PGD;
 	ptdump_walk_pgd_level_core(m, pgd, false, false);
 }
@@ -514,6 +515,8 @@ void ptdump_walk_shadow_pgd_level_checkw
 #ifdef CONFIG_KAISER
 	pgd_t *pgd = (pgd_t *) &init_top_pgt;
 
+	if (!kaiser_enabled)
+		return;
 	pr_info("x86/mm: Checking shadow page tables\n");
 	pgd += PTRS_PER_PGD;
 	ptdump_walk_pgd_level_core(NULL, pgd, true, false);
--- a/arch/x86/mm/init.c
+++ b/arch/x86/mm/init.c
@@ -20,6 +20,7 @@
 #include <asm/kaslr.h>
 #include <asm/hypervisor.h>
 #include <asm/cpufeature.h>
+#include <asm/kaiser.h>
 
 /*
  * We need to define the tracepoints somewhere, and tlb.c
@@ -163,9 +164,8 @@ static int page_size_mask;
 
 static void enable_global_pages(void)
 {
-#ifndef CONFIG_KAISER
-	__supported_pte_mask |= _PAGE_GLOBAL;
-#endif
+	if (!kaiser_enabled)
+		__supported_pte_mask |= _PAGE_GLOBAL;
 }
 
 static void __init probe_page_size_mask(void)
@@ -656,6 +656,7 @@ void __init init_mem_mapping(void)
 {
 	unsigned long end;
 
+	kaiser_check_cmdline();
 	probe_page_size_mask();
 	setup_pcid();
 
--- a/arch/x86/mm/kaiser.c
+++ b/arch/x86/mm/kaiser.c
@@ -34,6 +34,7 @@
 #include <linux/mm.h>
 #include <linux/uaccess.h>
 
+#include <asm/cmdline.h>
 #include <asm/kaiser.h>
 #include <asm/pgtable.h>
 #include <asm/pgalloc.h>
@@ -44,6 +45,16 @@
 
 static pteval_t kaiser_pte_mask __ro_after_init = ~(_PAGE_NX | _PAGE_GLOBAL);
 
+/* Global flag for boot time kaiser enable/disable */
+bool kaiser_enabled __ro_after_init = true;
+DEFINE_STATIC_KEY_TRUE(kaiser_enabled_key);
+
+void __init kaiser_check_cmdline(void)
+{
+	if (cmdline_find_option_bool(boot_command_line, "nokaiser"))
+		kaiser_enabled = false;
+}
+
 /*
  * At runtime, the only things we map are some things for CPU
  * hotplug, and stacks for new processes.  No two CPUs will ever
@@ -252,6 +263,9 @@ int kaiser_add_user_map(const void *__st
 	unsigned long target_address;
 	pte_t *pte;
 
+	if (!kaiser_enabled)
+		return 0;
+
 	/* Clear not supported bits */
 	flags &= kaiser_pte_mask;
 
@@ -402,6 +416,9 @@ void __init kaiser_init(void)
 {
 	int cpu;
 
+	if (!kaiser_enabled)
+		return;
+
 	kaiser_init_all_pgds();
 
 	for_each_possible_cpu(cpu) {
@@ -436,6 +453,16 @@ void __init kaiser_init(void)
 	kaiser_add_mapping_cpu_entry(0);
 }
 
+static int __init kaiser_boottime_control(void)
+{
+	if (!kaiser_enabled) {
+		static_branch_disable(&kaiser_enabled_key);
+		pr_info("kaiser: Disabled on command line\n");
+	}
+	return 0;
+}
+subsys_initcall(kaiser_boottime_control);
+
 int kaiser_add_mapping(unsigned long addr, unsigned long size,
 		       unsigned long flags)
 {
@@ -446,6 +473,9 @@ void kaiser_remove_mapping(unsigned long
 {
 	unsigned long addr;
 
+	if (!kaiser_enabled)
+		return;
+
 	/* The shadow page tables always use small pages: */
 	for (addr = start; addr < start + size; addr += PAGE_SIZE) {
 		/*
--- a/security/Kconfig
+++ b/security/Kconfig
@@ -56,7 +56,7 @@ config SECURITY_NETWORK
 
 config KAISER
 	bool "Remove the kernel mapping in user mode"
-	depends on X86_64 && SMP && !PARAVIRT
+	depends on X86_64 && SMP && !PARAVIRT && JUMP_LABEL
 	help
 	  This feature reduces the number of hardware side channels by
 	  ensuring that the majority of kernel addresses are not mapped


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  parent reply	other threads:[~2017-11-26 23:26 UTC|newest]

Thread overview: 64+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-11-26 23:14 [patch V2 0/5] x86/kaiser: Boot time disabling and debug support Thomas Gleixner
2017-11-26 23:14 ` Thomas Gleixner
2017-11-26 23:14 ` [patch V2 1/5] x86/kaiser: Respect disabled CPU features Thomas Gleixner
2017-11-26 23:14   ` Thomas Gleixner
2017-11-27  9:57   ` Peter Zijlstra
2017-11-27  9:57     ` Peter Zijlstra
2017-11-27 11:47     ` Thomas Gleixner
2017-11-27 11:47       ` Thomas Gleixner
2017-11-27 12:31       ` Brian Gerst
2017-11-27 12:31         ` Brian Gerst
2017-11-27 13:18         ` Thomas Gleixner
2017-11-27 13:18           ` Thomas Gleixner
2017-11-27 18:11   ` Dave Hansen
2017-11-27 18:11     ` Dave Hansen
2017-11-27 18:37     ` Kees Cook
2017-11-27 18:37       ` Kees Cook
2017-11-26 23:14 ` [patch V2 2/5] x86/kaiser: Simplify disabling of global pages Thomas Gleixner
2017-11-26 23:14   ` Thomas Gleixner
2017-11-27 11:49   ` Thomas Gleixner
2017-11-27 11:49     ` Thomas Gleixner
2017-11-27 18:15   ` Dave Hansen
2017-11-27 18:15     ` Dave Hansen
2017-11-27 20:28     ` Thomas Gleixner
2017-11-27 20:28       ` Thomas Gleixner
2017-11-26 23:14 ` [patch V2 3/5] x86/dump_pagetables: Check KAISER shadow page table for WX pages Thomas Gleixner
2017-11-26 23:14   ` Thomas Gleixner
2017-11-27 18:17   ` Dave Hansen
2017-11-27 18:17     ` Dave Hansen
2017-11-26 23:14 ` [patch V2 4/5] x86/mm/debug_pagetables: Allow dumping current pagetables Thomas Gleixner
2017-11-26 23:14   ` Thomas Gleixner
2017-11-27  9:41   ` Peter Zijlstra
2017-11-27  9:41     ` Peter Zijlstra
2017-11-27 10:06     ` [PATCH] vfs: Add PERM_* symbolic helpers for common file mode/permissions Ingo Molnar
2017-11-27 10:06       ` Ingo Molnar
2017-11-27 19:21       ` Linus Torvalds
2017-11-27 19:21         ` Linus Torvalds
2017-11-28 10:54         ` Ingo Molnar
2017-11-28 10:54           ` Ingo Molnar
2017-11-28 11:12         ` Ingo Molnar
2017-11-28 11:12           ` Ingo Molnar
2017-11-29  8:52           ` Michael Ellerman
2017-11-29  8:52             ` Michael Ellerman
2017-11-27 18:18   ` [patch V2 4/5] x86/mm/debug_pagetables: Allow dumping current pagetables Dave Hansen
2017-11-27 18:18     ` Dave Hansen
2017-11-26 23:14 ` Thomas Gleixner [this message]
2017-11-26 23:14   ` [patch V2 5/5] x86/kaiser: Add boottime disable switch Thomas Gleixner
2017-11-27  9:48   ` Peter Zijlstra
2017-11-27  9:48     ` Peter Zijlstra
2017-11-27 10:22     ` Peter Zijlstra
2017-11-27 10:22       ` Peter Zijlstra
2017-11-27 11:50       ` Thomas Gleixner
2017-11-27 11:50         ` Thomas Gleixner
2017-11-27 12:49         ` Peter Zijlstra
2017-11-27 12:49           ` Peter Zijlstra
2017-11-27 21:43       ` Peter Zijlstra
2017-11-27 21:43         ` Peter Zijlstra
2017-11-27 18:22   ` Dave Hansen
2017-11-27 18:22     ` Dave Hansen
2017-11-27 19:00     ` Thomas Gleixner
2017-11-27 19:00       ` Thomas Gleixner
2017-11-27 19:18       ` Josh Poimboeuf
2017-11-27 19:18         ` Josh Poimboeuf
2017-11-27 20:47         ` Thomas Gleixner
2017-11-27 20:47           ` Thomas Gleixner

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