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b90e483938
The kernel does not use any keys besides IA so we don't need to install IB/DA/DB/GA on kernel exit if we arrange to install them on task switch instead, which we can expect to happen an order of magnitude less often. Furthermore we can avoid installing the user IA in the case where the user task has IA disabled and just leave the kernel IA installed. This also lets us avoid needing to install IA on kernel entry. On an Apple M1 under a hypervisor, the overhead of kernel entry/exit has been measured to be reduced by 15.6ns in the case where IA is enabled, and 31.9ns in the case where IA is disabled. Signed-off-by: Peter Collingbourne <pcc@google.com> Link: https://linux-review.googlesource.com/id/Ieddf6b580d23c9e0bed45a822dabe72d2ffc9a8e Link: https://lore.kernel.org/r/2d653d055f38f779937f2b92f8ddd5cf9e4af4f4.1616123271.git.pcc@google.com Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
80 lines
2.2 KiB
C
80 lines
2.2 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef __ASM_ASM_POINTER_AUTH_H
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#define __ASM_ASM_POINTER_AUTH_H
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#include <asm/alternative.h>
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#include <asm/asm-offsets.h>
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#include <asm/cpufeature.h>
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#include <asm/sysreg.h>
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#ifdef CONFIG_ARM64_PTR_AUTH
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/*
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* thread.keys_user.ap* as offset exceeds the #imm offset range
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* so use the base value of ldp as thread.keys_user and offset as
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* thread.keys_user.ap*.
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*/
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.macro __ptrauth_keys_install_user tsk, tmp1, tmp2, tmp3
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mov \tmp1, #THREAD_KEYS_USER
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add \tmp1, \tsk, \tmp1
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ldp \tmp2, \tmp3, [\tmp1, #PTRAUTH_USER_KEY_APIA]
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msr_s SYS_APIAKEYLO_EL1, \tmp2
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msr_s SYS_APIAKEYHI_EL1, \tmp3
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.endm
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.macro __ptrauth_keys_install_kernel_nosync tsk, tmp1, tmp2, tmp3
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mov \tmp1, #THREAD_KEYS_KERNEL
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add \tmp1, \tsk, \tmp1
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ldp \tmp2, \tmp3, [\tmp1, #PTRAUTH_KERNEL_KEY_APIA]
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msr_s SYS_APIAKEYLO_EL1, \tmp2
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msr_s SYS_APIAKEYHI_EL1, \tmp3
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.endm
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.macro ptrauth_keys_install_kernel_nosync tsk, tmp1, tmp2, tmp3
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alternative_if ARM64_HAS_ADDRESS_AUTH
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__ptrauth_keys_install_kernel_nosync \tsk, \tmp1, \tmp2, \tmp3
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alternative_else_nop_endif
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.endm
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.macro ptrauth_keys_install_kernel tsk, tmp1, tmp2, tmp3
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alternative_if ARM64_HAS_ADDRESS_AUTH
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__ptrauth_keys_install_kernel_nosync \tsk, \tmp1, \tmp2, \tmp3
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isb
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alternative_else_nop_endif
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.endm
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.macro __ptrauth_keys_init_cpu tsk, tmp1, tmp2, tmp3
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mrs \tmp1, id_aa64isar1_el1
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ubfx \tmp1, \tmp1, #ID_AA64ISAR1_APA_SHIFT, #8
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cbz \tmp1, .Lno_addr_auth\@
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mov_q \tmp1, (SCTLR_ELx_ENIA | SCTLR_ELx_ENIB | \
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SCTLR_ELx_ENDA | SCTLR_ELx_ENDB)
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mrs \tmp2, sctlr_el1
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orr \tmp2, \tmp2, \tmp1
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msr sctlr_el1, \tmp2
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__ptrauth_keys_install_kernel_nosync \tsk, \tmp1, \tmp2, \tmp3
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isb
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.Lno_addr_auth\@:
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.endm
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.macro ptrauth_keys_init_cpu tsk, tmp1, tmp2, tmp3
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alternative_if_not ARM64_HAS_ADDRESS_AUTH
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b .Lno_addr_auth\@
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alternative_else_nop_endif
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__ptrauth_keys_init_cpu \tsk, \tmp1, \tmp2, \tmp3
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.Lno_addr_auth\@:
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.endm
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#else /* CONFIG_ARM64_PTR_AUTH */
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.macro ptrauth_keys_install_user tsk, tmp1, tmp2, tmp3
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.endm
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.macro ptrauth_keys_install_kernel_nosync tsk, tmp1, tmp2, tmp3
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.endm
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.macro ptrauth_keys_install_kernel tsk, tmp1, tmp2, tmp3
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.endm
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#endif /* CONFIG_ARM64_PTR_AUTH */
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#endif /* __ASM_ASM_POINTER_AUTH_H */
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