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arm64: mm: Add additional parameter to uaccess_ttbr0_disable 

Add an extra temporary register parameter to uaccess_ttbr0_disable which
is about to be required for arm64 PAN support.

This patch doesn't introduce any functional change but ensures that the
kernel compiles once the KVM/ARM tree is merged with the arm64 tree by
ensuring a trivially mergable conflict with commit
6b88a32c7a
("arm64: kpti: Fix the interaction between ASID switching and software PAN").

Cc: Will Deacon <will.deacon@arm.com>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Acked-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
This commit is contained in:
Christoffer Dall 2018-01-17 12:35:27 +01:00
parent 448fadc8a4
commit 0482b50546
7 changed files with 11 additions and 11 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
arch/arm64/include/asm/asm-uaccess.h
View File

@ -25,7 +25,7 @@
isb
.endm
.macro uaccess_ttbr0_disable, tmp1
.macro uaccess_ttbr0_disable, tmp1, tmp2
alternative_if_not ARM64_HAS_PAN
__uaccess_ttbr0_disable \tmp1
alternative_else_nop_endif
@ -39,7 +39,7 @@ alternative_if_not ARM64_HAS_PAN
alternative_else_nop_endif
.endm
#else
.macro uaccess_ttbr0_disable, tmp1
.macro uaccess_ttbr0_disable, tmp1, tmp2
.endm
.macro uaccess_ttbr0_enable, tmp1, tmp2, tmp3
@ -49,8 +49,8 @@ alternative_else_nop_endif
/*
* These macros are no-ops when UAO is present.
*/
.macro uaccess_disable_not_uao, tmp1
uaccess_ttbr0_disable \tmp1
.macro uaccess_disable_not_uao, tmp1, tmp2
uaccess_ttbr0_disable \tmp1, \tmp2
alternative_if ARM64_ALT_PAN_NOT_UAO
SET_PSTATE_PAN(1)
alternative_else_nop_endif

2
arch/arm64/lib/clear_user.S
View File

@ -50,7 +50,7 @@ uao_user_alternative 9f, strh, sttrh, wzr, x0, 2
b.mi 5f
uao_user_alternative 9f, strb, sttrb, wzr, x0, 0
5: mov x0, #0
uaccess_disable_not_uao x2
uaccess_disable_not_uao x2, x3
ret
ENDPROC(__clear_user)

2
arch/arm64/lib/copy_from_user.S
View File

@ -67,7 +67,7 @@ ENTRY(__arch_copy_from_user)
uaccess_enable_not_uao x3, x4
add end, x0, x2
#include "copy_template.S"
uaccess_disable_not_uao x3
uaccess_disable_not_uao x3, x4
mov x0, #0 // Nothing to copy
ret
ENDPROC(__arch_copy_from_user)

2
arch/arm64/lib/copy_in_user.S
View File

@ -68,7 +68,7 @@ ENTRY(raw_copy_in_user)
uaccess_enable_not_uao x3, x4
add end, x0, x2
#include "copy_template.S"
uaccess_disable_not_uao x3
uaccess_disable_not_uao x3, x4
mov x0, #0
ret
ENDPROC(raw_copy_in_user)

2
arch/arm64/lib/copy_to_user.S
View File

@ -66,7 +66,7 @@ ENTRY(__arch_copy_to_user)
uaccess_enable_not_uao x3, x4
add end, x0, x2
#include "copy_template.S"
uaccess_disable_not_uao x3
uaccess_disable_not_uao x3, x4
mov x0, #0
ret
ENDPROC(__arch_copy_to_user)

4
arch/arm64/mm/cache.S
View File

@ -63,7 +63,7 @@ user_alt 9f, "dc cvau, x4", "dc civac, x4", ARM64_WORKAROUND_CLEAN_CACHE
invalidate_icache_by_line x0, x1, x2, x3, 9f
mov x0, #0
1:
uaccess_ttbr0_disable x1
uaccess_ttbr0_disable x1, x2
ret
9:
mov x0, #-EFAULT
@ -85,7 +85,7 @@ ENTRY(invalidate_icache_range)
invalidate_icache_by_line x0, x1, x2, x3, 2f
mov x0, xzr
1:
uaccess_ttbr0_disable x1
uaccess_ttbr0_disable x1, x2
ret
2:
mov x0, #-EFAULT

2
arch/arm64/xen/hypercall.S
View File

@ -107,6 +107,6 @@ ENTRY(privcmd_call)
/*
* Disable userspace access from kernel once the hyp call completed.
*/
uaccess_ttbr0_disable x6
uaccess_ttbr0_disable x6, x7
ret
ENDPROC(privcmd_call);