112 lines
3.6 KiB
C
112 lines
3.6 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/* arch/arm64/include/asm/kvm_ptrauth.h: Guest/host ptrauth save/restore
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* Copyright 2019 Arm Limited
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* Authors: Mark Rutland <mark.rutland@arm.com>
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* Amit Daniel Kachhap <amit.kachhap@arm.com>
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*/
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#ifndef __ASM_KVM_PTRAUTH_H
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#define __ASM_KVM_PTRAUTH_H
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#ifdef __ASSEMBLY__
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#include <asm/sysreg.h>
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#ifdef CONFIG_ARM64_PTR_AUTH
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#define PTRAUTH_REG_OFFSET(x) (x - CPU_APIAKEYLO_EL1)
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/*
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* CPU_AP*_EL1 values exceed immediate offset range (512) for stp
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* instruction so below macros takes CPU_APIAKEYLO_EL1 as base and
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* calculates the offset of the keys from this base to avoid an extra add
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* instruction. These macros assumes the keys offsets follow the order of
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* the sysreg enum in kvm_host.h.
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*/
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.macro ptrauth_save_state base, reg1, reg2
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mrs_s \reg1, SYS_APIAKEYLO_EL1
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mrs_s \reg2, SYS_APIAKEYHI_EL1
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stp \reg1, \reg2, [\base, #PTRAUTH_REG_OFFSET(CPU_APIAKEYLO_EL1)]
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mrs_s \reg1, SYS_APIBKEYLO_EL1
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mrs_s \reg2, SYS_APIBKEYHI_EL1
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stp \reg1, \reg2, [\base, #PTRAUTH_REG_OFFSET(CPU_APIBKEYLO_EL1)]
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mrs_s \reg1, SYS_APDAKEYLO_EL1
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mrs_s \reg2, SYS_APDAKEYHI_EL1
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stp \reg1, \reg2, [\base, #PTRAUTH_REG_OFFSET(CPU_APDAKEYLO_EL1)]
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mrs_s \reg1, SYS_APDBKEYLO_EL1
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mrs_s \reg2, SYS_APDBKEYHI_EL1
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stp \reg1, \reg2, [\base, #PTRAUTH_REG_OFFSET(CPU_APDBKEYLO_EL1)]
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mrs_s \reg1, SYS_APGAKEYLO_EL1
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mrs_s \reg2, SYS_APGAKEYHI_EL1
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stp \reg1, \reg2, [\base, #PTRAUTH_REG_OFFSET(CPU_APGAKEYLO_EL1)]
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.endm
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.macro ptrauth_restore_state base, reg1, reg2
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ldp \reg1, \reg2, [\base, #PTRAUTH_REG_OFFSET(CPU_APIAKEYLO_EL1)]
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msr_s SYS_APIAKEYLO_EL1, \reg1
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msr_s SYS_APIAKEYHI_EL1, \reg2
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ldp \reg1, \reg2, [\base, #PTRAUTH_REG_OFFSET(CPU_APIBKEYLO_EL1)]
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msr_s SYS_APIBKEYLO_EL1, \reg1
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msr_s SYS_APIBKEYHI_EL1, \reg2
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ldp \reg1, \reg2, [\base, #PTRAUTH_REG_OFFSET(CPU_APDAKEYLO_EL1)]
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msr_s SYS_APDAKEYLO_EL1, \reg1
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msr_s SYS_APDAKEYHI_EL1, \reg2
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ldp \reg1, \reg2, [\base, #PTRAUTH_REG_OFFSET(CPU_APDBKEYLO_EL1)]
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msr_s SYS_APDBKEYLO_EL1, \reg1
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msr_s SYS_APDBKEYHI_EL1, \reg2
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ldp \reg1, \reg2, [\base, #PTRAUTH_REG_OFFSET(CPU_APGAKEYLO_EL1)]
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msr_s SYS_APGAKEYLO_EL1, \reg1
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msr_s SYS_APGAKEYHI_EL1, \reg2
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.endm
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/*
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* Both ptrauth_switch_to_guest and ptrauth_switch_to_host macros will
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* check for the presence of one of the cpufeature flag
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* ARM64_HAS_ADDRESS_AUTH_ARCH or ARM64_HAS_ADDRESS_AUTH_IMP_DEF and
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* then proceed ahead with the save/restore of Pointer Authentication
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* key registers.
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*/
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.macro ptrauth_switch_to_guest g_ctxt, reg1, reg2, reg3
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alternative_if ARM64_HAS_ADDRESS_AUTH_ARCH
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b 1000f
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alternative_else_nop_endif
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alternative_if_not ARM64_HAS_ADDRESS_AUTH_IMP_DEF
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b 1001f
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alternative_else_nop_endif
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1000:
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ldr \reg1, [\g_ctxt, #(VCPU_HCR_EL2 - VCPU_CONTEXT)]
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and \reg1, \reg1, #(HCR_API | HCR_APK)
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cbz \reg1, 1001f
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add \reg1, \g_ctxt, #CPU_APIAKEYLO_EL1
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ptrauth_restore_state \reg1, \reg2, \reg3
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1001:
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.endm
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.macro ptrauth_switch_to_host g_ctxt, h_ctxt, reg1, reg2, reg3
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alternative_if ARM64_HAS_ADDRESS_AUTH_ARCH
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b 2000f
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alternative_else_nop_endif
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alternative_if_not ARM64_HAS_ADDRESS_AUTH_IMP_DEF
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b 2001f
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alternative_else_nop_endif
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2000:
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ldr \reg1, [\g_ctxt, #(VCPU_HCR_EL2 - VCPU_CONTEXT)]
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and \reg1, \reg1, #(HCR_API | HCR_APK)
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cbz \reg1, 2001f
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add \reg1, \g_ctxt, #CPU_APIAKEYLO_EL1
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ptrauth_save_state \reg1, \reg2, \reg3
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add \reg1, \h_ctxt, #CPU_APIAKEYLO_EL1
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ptrauth_restore_state \reg1, \reg2, \reg3
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isb
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2001:
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.endm
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#else /* !CONFIG_ARM64_PTR_AUTH */
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.macro ptrauth_switch_to_guest g_ctxt, reg1, reg2, reg3
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.endm
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.macro ptrauth_switch_to_host g_ctxt, h_ctxt, reg1, reg2, reg3
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.endm
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#endif /* CONFIG_ARM64_PTR_AUTH */
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#endif /* __ASSEMBLY__ */
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#endif /* __ASM_KVM_PTRAUTH_H */
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