LXR linux/arch/arm64/kvm/hyp/include/hyp/adjust

   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
  16static 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 */
  33static 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 */
  48static 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