| 1 | // SPDX-License-Identifier: GPL-2.0-only |
|---|---|
| 2 | /* |
| 3 | * Guest PC manipulation helpers |
| 4 | * |
| 5 | * Copyright (C) 2012,2013 - ARM Ltd |
| 6 | * Copyright (C) 2020 - Google LLC |
| 7 | * Author: Marc Zyngier <maz@kernel.org> |
| 8 | */ |
| 9 | |
| 10 | #ifndef __ARM64_KVM_HYP_ADJUST_PC_H__ |
| 11 | #define __ARM64_KVM_HYP_ADJUST_PC_H__ |
| 12 | |
| 13 | #include <asm/kvm_emulate.h> |
| 14 | #include <asm/kvm_host.h> |
| 15 | |
| 16 | static inline void kvm_skip_instr(struct kvm_vcpu *vcpu) |
| 17 | { |
| 18 | if (vcpu_mode_is_32bit(vcpu)) { |
| 19 | kvm_skip_instr32(vcpu); |
| 20 | } else { |
| 21 | *vcpu_pc(vcpu) += 4; |
| 22 | *vcpu_cpsr(vcpu) &= ~PSR_BTYPE_MASK; |
| 23 | } |
| 24 | |
| 25 | /* advance the singlestep state machine */ |
| 26 | *vcpu_cpsr(vcpu) &= ~DBG_SPSR_SS; |
| 27 | } |
| 28 | |
| 29 | /* |
| 30 | * Skip an instruction which has been emulated at hyp while most guest sysregs |
| 31 | * are live. |
| 32 | */ |
| 33 | static inline void __kvm_skip_instr(struct kvm_vcpu *vcpu) |
| 34 | { |
| 35 | *vcpu_pc(vcpu) = read_sysreg_el2(SYS_ELR); |
| 36 | vcpu_gp_regs(vcpu)->pstate = read_sysreg_el2(SYS_SPSR); |
| 37 | |
| 38 | kvm_skip_instr(vcpu); |
| 39 | |
| 40 | write_sysreg_el2(vcpu_gp_regs(vcpu)->pstate, SYS_SPSR); |
| 41 | write_sysreg_el2(*vcpu_pc(vcpu), SYS_ELR); |
| 42 | } |
| 43 | |
| 44 | /* |
| 45 | * Skip an instruction while host sysregs are live. |
| 46 | * Assumes host is always 64-bit. |
| 47 | */ |
| 48 | static inline void kvm_skip_host_instr(void) |
| 49 | { |
| 50 | write_sysreg_el2(read_sysreg_el2(SYS_ELR) + 4, SYS_ELR); |
| 51 | } |
| 52 | |
| 53 | #endif |
| 54 |