linux-kernel - [PATCH 4.1 39/65] kaiser: name that 0x1000 KAISER_SHADOW_PGD

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Message-Id: <20180306002538.1761-40-pasha.tatashin@oracle.com>
Date:   Mon,  5 Mar 2018 19:25:12 -0500
From:   Pavel Tatashin <pasha.tatashin@...cle.com>
To:     steven.sistare@...cle.com, daniel.m.jordan@...cle.com,
        linux-kernel@...r.kernel.org, Alexander.Levin@...rosoft.com,
        dan.j.williams@...el.com, sathyanarayanan.kuppuswamy@...el.com,
        pankaj.laxminarayan.bharadiya@...el.com, akuster@...sta.com,
        cminyard@...sta.com, pasha.tatashin@...cle.com,
        gregkh@...uxfoundation.org, stable@...r.kernel.org
Subject: [PATCH 4.1 39/65] kaiser: name that 0x1000 KAISER_SHADOW_PGD_OFFSET

From: Hugh Dickins <hughd@...gle.com>

There's a 0x1000 in various places, which looks better with a name.

Signed-off-by: Hugh Dickins <hughd@...gle.com>
Acked-by: Jiri Kosina <jkosina@...e.cz>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
(cherry picked from commit aeda21d77e22fb382c51fd3f6bbb18df69bc032f)
Signed-off-by: Pavel Tatashin <pasha.tatashin@...cle.com>

Conflicts:
	arch/x86/entry/entry_64.S (not in this tree)
	arch/x86/kernel/entry_64.S (patched instead of that)
---
 arch/x86/include/asm/kaiser.h | 7 +++++--
 arch/x86/kernel/entry_64.S    | 4 ++--
 2 files changed, 7 insertions(+), 4 deletions(-)

diff --git a/arch/x86/include/asm/kaiser.h b/arch/x86/include/asm/kaiser.h
index 7394ba9f9951..051acf678cda 100644
--- a/arch/x86/include/asm/kaiser.h
+++ b/arch/x86/include/asm/kaiser.h
@@ -13,13 +13,16 @@
  * A minimalistic kernel mapping holds the parts needed to be mapped in user
  * mode, such as the entry/exit functions of the user space, or the stacks.
  */
+
+#define KAISER_SHADOW_PGD_OFFSET 0x1000
+
 #ifdef __ASSEMBLY__
 #ifdef CONFIG_KAISER
 
 .macro _SWITCH_TO_KERNEL_CR3 reg
 movq %cr3, \reg
 #ifdef CONFIG_KAISER_REAL_SWITCH
-andq $(~0x1000), \reg
+andq $(~KAISER_SHADOW_PGD_OFFSET), \reg
 #endif
 movq \reg, %cr3
 .endm
@@ -27,7 +30,7 @@ movq \reg, %cr3
 .macro _SWITCH_TO_USER_CR3 reg
 movq %cr3, \reg
 #ifdef CONFIG_KAISER_REAL_SWITCH
-orq $(0x1000), \reg
+orq $(KAISER_SHADOW_PGD_OFFSET), \reg
 #endif
 movq \reg, %cr3
 .endm
diff --git a/arch/x86/kernel/entry_64.S b/arch/x86/kernel/entry_64.S
index 8e4056d4b1d6..5c6c11d9d779 100644
--- a/arch/x86/kernel/entry_64.S
+++ b/arch/x86/kernel/entry_64.S
@@ -1542,7 +1542,7 @@ ENTRY(nmi)
 	movq	%cr3, %rax
 	pushq	%rax
 #ifdef CONFIG_KAISER_REAL_SWITCH
-	andq	$(~0x1000), %rax
+	andq	$(~KAISER_SHADOW_PGD_OFFSET), %rax
 #endif
 	movq	%rax, %cr3
 #endif
@@ -1780,7 +1780,7 @@ end_repeat_nmi:
 	movq	%cr3, %rax
 	pushq	%rax
 #ifdef CONFIG_KAISER_REAL_SWITCH
-	andq	$(~0x1000), %rax
+	andq	$(~KAISER_SHADOW_PGD_OFFSET), %rax
 #endif
 	movq	%rax, %cr3
 #endif
-- 
2.16.2