Patch "kaiser: name that 0x1000 KAISER_SHADOW_PGD_OFFSET" has been added to the 4.4-stable tree

Patch "kaiser: name that 0x1000 KAISER_SHADOW_PGD_OFFSET" has been added to the 4.4-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    kaiser: name that 0x1000 KAISER_SHADOW_PGD_OFFSET

to the 4.4-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     kaiser-name-that-0x1000-kaiser_shadow_pgd_offset.patch
and it can be found in the queue-4.4 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From foo@baz Wed Jan  3 18:58:12 CET 2018
From: Hugh Dickins <hughd@google.com>
Date: Sat, 9 Sep 2017 17:31:18 -0700
Subject: kaiser: name that 0x1000 KAISER_SHADOW_PGD_OFFSET

From: Hugh Dickins <hughd@google.com>


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

Signed-off-by: Hugh Dickins <hughd@google.com>
Acked-by: Jiri Kosina <jkosina@suse.cz>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 arch/x86/entry/entry_64.S     |    4 ++--
 arch/x86/include/asm/kaiser.h |    7 +++++--
 2 files changed, 7 insertions(+), 4 deletions(-)

--- a/arch/x86/entry/entry_64.S
+++ b/arch/x86/entry/entry_64.S
@@ -1292,7 +1292,7 @@ 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
@@ -1535,7 +1535,7 @@ 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
--- 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


Patches currently in stable-queue which might be from hughd@google.com are

queue-4.4/kaiser-vmstat-show-nr_kaisertable-as-nr_overhead.patch
queue-4.4/kaiser-add-nokaiser-boot-option-using-alternative.patch
queue-4.4/kaiser-fix-unlikely-error-in-alloc_ldt_struct.patch
queue-4.4/kaiser-_pgd_alloc-without-__gfp_repeat-to-avoid-stalls.patch
queue-4.4/kaiser-kaiser_flush_tlb_on_return_to_user-check-pcid.patch
queue-4.4/x86-paravirt-dont-patch-flush_tlb_single.patch
queue-4.4/kaiser-merged-update.patch
queue-4.4/kaiser-delete-kaiser_real_switch-option.patch
queue-4.4/kaiser-kaiser_remove_mapping-move-along-the-pgd.patch
queue-4.4/kaiser-fix-perf-crashes.patch
queue-4.4/kaiser-drop-is_atomic-arg-to-kaiser_pagetable_walk.patch
queue-4.4/kaiser-load_new_mm_cr3-let-switch_user_cr3-flush-user.patch
queue-4.4/kaiser-enhanced-by-kernel-and-user-pcids.patch
queue-4.4/kaiser-x86_cr3_pcid_noflush-and-x86_cr3_pcid_user.patch
queue-4.4/kaiser-use-alternative-instead-of-x86_cr3_pcid_noflush.patch
queue-4.4/kaiser-stack-map-page_size-at-thread_size-page_size.patch
queue-4.4/kaiser-name-that-0x1000-kaiser_shadow_pgd_offset.patch
queue-4.4/kaiser-fix-regs-to-do_nmi-ifndef-config_kaiser.patch
queue-4.4/kaiser-do-not-set-_page_nx-on-pgd_none.patch
queue-4.4/kaiser-tidied-up-asm-kaiser.h-somewhat.patch
queue-4.4/kaiser-cleanups-while-trying-for-gold-link.patch
queue-4.4/kaiser-tidied-up-kaiser_add-remove_mapping-slightly.patch
queue-4.4/kaiser-fix-build-and-fixme-in-alloc_ldt_struct.patch
queue-4.4/kaiser-kernel-address-isolation.patch
queue-4.4/kaiser-enomem-if-kaiser_pagetable_walk-null.patch
queue-4.4/kaiser-asm-tlbflush.h-handle-nopge-at-lower-level.patch
queue-4.4/kaiser-paranoid_entry-pass-cr3-need-to-paranoid_exit.patch
queue-4.4/kaiser-kaiser-depends-on-smp.patch
queue-4.4/kaiser-pcid-0-for-kernel-and-128-for-user.patch