kaiser: delete KAISER_REAL_SWITCH option

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.)

Signed-off-by: Hugh Dickins <hughd@google.com>
Acked-by: Jiri Kosina <jkosina@suse.cz>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/arch/x86/entry/entry_64.S b/arch/x86/entry/entry_64.S
index 82661cd..a058e0f 100644 (file)
--- a/arch/x86/entry/entry_64.S
+++ b/arch/x86/entry/entry_64.S
@@ -1291,9 +1291,7 @@ 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
@@ -1534,9 +1532,7 @@ 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
 

diff --git a/arch/x86/include/asm/kaiser.h b/arch/x86/include/asm/kaiser.h
index 051acf6..e0fc45e 100644 (file)
--- 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
 

diff --git a/security/Kconfig b/security/Kconfig
index 0d54e3c..8d5d240 100644 (file)
--- 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