This is a note to let you know that I've just added the patch titled
kaiser: delete KAISER_REAL_SWITCH option
to the 4.9-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-delete-kaiser_real_switch-option.patch
and it can be found in the queue-4.9 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From foo@baz Wed Jan 3 20:37:21 CET 2018
From: Hugh Dickins <hughd@xxxxxxxxxx>
Date: Sun, 3 Sep 2017 18:30:43 -0700
Subject: kaiser: delete KAISER_REAL_SWITCH option
From: Hugh Dickins <hughd@xxxxxxxxxx>
We fail to see what CONFIG_KAISER_REAL_SWITCH is for: it seems to be
left over from early development, and now just obscures tricky parts
of the code. Delete it before adding PCIDs, or nokaiser boot option.
(Or if there is some good reason to keep the option, then it needs
a help text - and a "depends on KAISER", so that all those without
KAISER are not asked the question. But we'd much rather delete it.)
Signed-off-by: Hugh Dickins <hughd@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/x86/entry/entry_64.S | 4 ----
arch/x86/include/asm/kaiser.h | 4 ----
security/Kconfig | 4 ----
3 files changed, 12 deletions(-)
--- a/arch/x86/entry/entry_64.S
+++ b/arch/x86/entry/entry_64.S
@@ -1317,9 +1317,7 @@ ENTRY(nmi)
/* %rax is saved above, so OK to clobber here */
movq %cr3, %rax
pushq %rax
-#ifdef CONFIG_KAISER_REAL_SWITCH
andq $(~KAISER_SHADOW_PGD_OFFSET), %rax
-#endif
movq %rax, %cr3
#endif
call do_nmi
@@ -1560,9 +1558,7 @@ end_repeat_nmi:
/* %rax is saved above, so OK to clobber here */
movq %cr3, %rax
pushq %rax
-#ifdef CONFIG_KAISER_REAL_SWITCH
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
@@ -21,17 +21,13 @@
.macro _SWITCH_TO_KERNEL_CR3 reg
movq %cr3, \reg
-#ifdef CONFIG_KAISER_REAL_SWITCH
andq $(~KAISER_SHADOW_PGD_OFFSET), \reg
-#endif
movq \reg, %cr3
.endm
.macro _SWITCH_TO_USER_CR3 reg
movq %cr3, \reg
-#ifdef CONFIG_KAISER_REAL_SWITCH
orq $(KAISER_SHADOW_PGD_OFFSET), \reg
-#endif
movq \reg, %cr3
.endm
--- a/security/Kconfig
+++ b/security/Kconfig
@@ -41,10 +41,6 @@ config KAISER
If you are unsure how to answer this question, answer Y.
-config KAISER_REAL_SWITCH
- bool "KAISER: actually switch page tables"
- default y
-
config SECURITYFS
bool "Enable the securityfs filesystem"
help
Patches currently in stable-queue which might be from hughd@xxxxxxxxxx are
queue-4.9/kaiser-vmstat-show-nr_kaisertable-as-nr_overhead.patch
queue-4.9/kaiser-add-nokaiser-boot-option-using-alternative.patch
queue-4.9/kaiser-fix-unlikely-error-in-alloc_ldt_struct.patch
queue-4.9/kaiser-kaiser_flush_tlb_on_return_to_user-check-pcid.patch
queue-4.9/x86-paravirt-dont-patch-flush_tlb_single.patch
queue-4.9/kaiser-merged-update.patch
queue-4.9/kaiser-delete-kaiser_real_switch-option.patch
queue-4.9/kaiser-kaiser_remove_mapping-move-along-the-pgd.patch
queue-4.9/kaiser-fix-perf-crashes.patch
queue-4.9/kaiser-drop-is_atomic-arg-to-kaiser_pagetable_walk.patch
queue-4.9/kaiser-load_new_mm_cr3-let-switch_user_cr3-flush-user.patch
queue-4.9/kaiser-enhanced-by-kernel-and-user-pcids.patch
queue-4.9/kaiser-x86_cr3_pcid_noflush-and-x86_cr3_pcid_user.patch
queue-4.9/kaiser-align-addition-to-x86-mm-makefile.patch
queue-4.9/kaiser-use-alternative-instead-of-x86_cr3_pcid_noflush.patch
queue-4.9/kaiser-stack-map-page_size-at-thread_size-page_size.patch
queue-4.9/kaiser-name-that-0x1000-kaiser_shadow_pgd_offset.patch
queue-4.9/kaiser-fix-regs-to-do_nmi-ifndef-config_kaiser.patch
queue-4.9/kaiser-do-not-set-_page_nx-on-pgd_none.patch
queue-4.9/kaiser-tidied-up-asm-kaiser.h-somewhat.patch
queue-4.9/kaiser-cleanups-while-trying-for-gold-link.patch
queue-4.9/kaiser-tidied-up-kaiser_add-remove_mapping-slightly.patch
queue-4.9/kaiser-fix-build-and-fixme-in-alloc_ldt_struct.patch
queue-4.9/kaiser-kernel-address-isolation.patch
queue-4.9/kaiser-enomem-if-kaiser_pagetable_walk-null.patch
queue-4.9/kaiser-asm-tlbflush.h-handle-nopge-at-lower-level.patch
queue-4.9/kaiser-paranoid_entry-pass-cr3-need-to-paranoid_exit.patch
queue-4.9/kaiser-kaiser-depends-on-smp.patch
queue-4.9/kaiser-pcid-0-for-kernel-and-128-for-user.patch