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/* SPDX-License-Identifier: GPL-2.0 */ /* arch/arm64/include/asm/kvm_ptrauth.h: Guest/host ptrauth save/restore * Copyright 2019 Arm Limited * Authors: Mark Rutland <mark.rutland@arm.com> * Amit Daniel Kachhap <amit.kachhap@arm.com> */ #ifndef __ASM_KVM_PTRAUTH_H #define __ASM_KVM_PTRAUTH_H #ifdef __ASSEMBLY__ #include <asm/sysreg.h> #ifdef CONFIG_ARM64_PTR_AUTH #define PTRAUTH_REG_OFFSET(x) (x - CPU_APIAKEYLO_EL1) /* * CPU_AP*_EL1 values exceed immediate offset range (512) for stp * instruction so below macros takes CPU_APIAKEYLO_EL1 as base and * calculates the offset of the keys from this base to avoid an extra add * instruction. These macros assumes the keys offsets follow the order of * the sysreg enum in kvm_host.h. */ .macro ptrauth_save_state base, reg1, reg2 mrs_s \reg1, SYS_APIAKEYLO_EL1 mrs_s \reg2, SYS_APIAKEYHI_EL1 stp \reg1, \reg2, [\base, #PTRAUTH_REG_OFFSET(CPU_APIAKEYLO_EL1)] mrs_s \reg1, SYS_APIBKEYLO_EL1 mrs_s \reg2, SYS_APIBKEYHI_EL1 stp \reg1, \reg2, [\base, #PTRAUTH_REG_OFFSET(CPU_APIBKEYLO_EL1)] mrs_s \reg1, SYS_APDAKEYLO_EL1 mrs_s \reg2, SYS_APDAKEYHI_EL1 stp \reg1, \reg2, [\base, #PTRAUTH_REG_OFFSET(CPU_APDAKEYLO_EL1)] mrs_s \reg1, SYS_APDBKEYLO_EL1 mrs_s \reg2, SYS_APDBKEYHI_EL1 stp \reg1, \reg2, [\base, #PTRAUTH_REG_OFFSET(CPU_APDBKEYLO_EL1)] mrs_s \reg1, SYS_APGAKEYLO_EL1 mrs_s \reg2, SYS_APGAKEYHI_EL1 stp \reg1, \reg2, [\base, #PTRAUTH_REG_OFFSET(CPU_APGAKEYLO_EL1)] .endm .macro ptrauth_restore_state base, reg1, reg2 ldp \reg1, \reg2, [\base, #PTRAUTH_REG_OFFSET(CPU_APIAKEYLO_EL1)] msr_s SYS_APIAKEYLO_EL1, \reg1 msr_s SYS_APIAKEYHI_EL1, \reg2 ldp \reg1, \reg2, [\base, #PTRAUTH_REG_OFFSET(CPU_APIBKEYLO_EL1)] msr_s SYS_APIBKEYLO_EL1, \reg1 msr_s SYS_APIBKEYHI_EL1, \reg2 ldp \reg1, \reg2, [\base, #PTRAUTH_REG_OFFSET(CPU_APDAKEYLO_EL1)] msr_s SYS_APDAKEYLO_EL1, \reg1 msr_s SYS_APDAKEYHI_EL1, \reg2 ldp \reg1, \reg2, [\base, #PTRAUTH_REG_OFFSET(CPU_APDBKEYLO_EL1)] msr_s SYS_APDBKEYLO_EL1, \reg1 msr_s SYS_APDBKEYHI_EL1, \reg2 ldp \reg1, \reg2, [\base, #PTRAUTH_REG_OFFSET(CPU_APGAKEYLO_EL1)] msr_s SYS_APGAKEYLO_EL1, \reg1 msr_s SYS_APGAKEYHI_EL1, \reg2 .endm /* * Both ptrauth_switch_to_guest and ptrauth_switch_to_hyp macros will * check for the presence ARM64_HAS_ADDRESS_AUTH, which is defined as * (ARM64_HAS_ADDRESS_AUTH_ARCH || ARM64_HAS_ADDRESS_AUTH_IMP_DEF) and * then proceed ahead with the save/restore of Pointer Authentication * key registers if enabled for the guest. */ .macro ptrauth_switch_to_guest g_ctxt, reg1, reg2, reg3 alternative_if_not ARM64_HAS_ADDRESS_AUTH b .L__skip_switch\@ alternative_else_nop_endif mrs \reg1, hcr_el2 and \reg1, \reg1, #(HCR_API | HCR_APK) cbz \reg1, .L__skip_switch\@ add \reg1, \g_ctxt, #CPU_APIAKEYLO_EL1 ptrauth_restore_state \reg1, \reg2, \reg3 .L__skip_switch\@: .endm .macro ptrauth_switch_to_hyp g_ctxt, h_ctxt, reg1, reg2, reg3 alternative_if_not ARM64_HAS_ADDRESS_AUTH b .L__skip_switch\@ alternative_else_nop_endif mrs \reg1, hcr_el2 and \reg1, \reg1, #(HCR_API | HCR_APK) cbz \reg1, .L__skip_switch\@ add \reg1, \g_ctxt, #CPU_APIAKEYLO_EL1 ptrauth_save_state \reg1, \reg2, \reg3 add \reg1, \h_ctxt, #CPU_APIAKEYLO_EL1 ptrauth_restore_state \reg1, \reg2, \reg3 isb .L__skip_switch\@: .endm #else /* !CONFIG_ARM64_PTR_AUTH */ .macro ptrauth_switch_to_guest g_ctxt, reg1, reg2, reg3 .endm .macro ptrauth_switch_to_hyp g_ctxt, h_ctxt, reg1, reg2, reg3 .endm #endif /* CONFIG_ARM64_PTR_AUTH */ #endif /* __ASSEMBLY__ */ #endif /* __ASM_KVM_PTRAUTH_H */