LXR linux/arch/arm64/include/asm/kvm

   1/* SPDX-License-Identifier: GPL-2.0-only */
   2/*
   3 * Copyright (C) 2015 - ARM Ltd
   4 * Author: Marc Zyngier <marc.zyngier@arm.com>
   5 */
   6
   7#ifndef __ARM64_KVM_HYP_H__
   8#define __ARM64_KVM_HYP_H__
   9
  10#include <linux/compiler.h>
  11#include <linux/kvm_host.h>
  12#include <asm/alternative.h>
  13#include <asm/sysreg.h>
  14
  15DECLARE_PER_CPU(struct kvm_cpu_context, kvm_hyp_ctxt);
  16DECLARE_PER_CPU(unsigned long, kvm_hyp_vector);
  17DECLARE_PER_CPU(struct kvm_nvhe_init_params, kvm_init_params);
  18
  19#define read_sysreg_elx(r,nvh,vh)                                       \
  20        ({                                                              \
  21                u64 reg;                                                \
  22                asm volatile(ALTERNATIVE(__mrs_s("%0", r##nvh), \
  23                                         __mrs_s("%0", r##vh),          \
  24                                         ARM64_HAS_VIRT_HOST_EXTN)      \
  25                             : "=r" (reg));                             \
  26                reg;                                                    \
  27        })
  28
  29#define write_sysreg_elx(v,r,nvh,vh)                                    \
  30        do {                                                            \
  31                u64 __val = (u64)(v);                                   \
  32                asm volatile(ALTERNATIVE(__msr_s(r##nvh, "%x0"),        \
  33                                         __msr_s(r##vh, "%x0"),         \
  34                                         ARM64_HAS_VIRT_HOST_EXTN)      \
  35                                         : : "rZ" (__val));             \
  36        } while (0)
  37
  38/*
  39 * Unified accessors for registers that have a different encoding
  40 * between VHE and non-VHE. They must be specified without their "ELx"
  41 * encoding, but with the SYS_ prefix, as defined in asm/sysreg.h.
  42 */
  43
  44#define read_sysreg_el0(r)      read_sysreg_elx(r, _EL0, _EL02)
  45#define write_sysreg_el0(v,r)   write_sysreg_elx(v, r, _EL0, _EL02)
  46#define read_sysreg_el1(r)      read_sysreg_elx(r, _EL1, _EL12)
  47#define write_sysreg_el1(v,r)   write_sysreg_elx(v, r, _EL1, _EL12)
  48#define read_sysreg_el2(r)      read_sysreg_elx(r, _EL2, _EL1)
  49#define write_sysreg_el2(v,r)   write_sysreg_elx(v, r, _EL2, _EL1)
  50
  51/*
  52 * Without an __arch_swab32(), we fall back to ___constant_swab32(), but the
  53 * static inline can allow the compiler to out-of-line this. KVM always wants
  54 * the macro version as its always inlined.
  55 */
  56#define __kvm_swab32(x) ___constant_swab32(x)
  57
  58int __vgic_v2_perform_cpuif_access(struct kvm_vcpu *vcpu);
  59
  60void __vgic_v3_save_state(struct vgic_v3_cpu_if *cpu_if);
  61void __vgic_v3_restore_state(struct vgic_v3_cpu_if *cpu_if);
  62void __vgic_v3_activate_traps(struct vgic_v3_cpu_if *cpu_if);
  63void __vgic_v3_deactivate_traps(struct vgic_v3_cpu_if *cpu_if);
  64void __vgic_v3_save_aprs(struct vgic_v3_cpu_if *cpu_if);
  65void __vgic_v3_restore_aprs(struct vgic_v3_cpu_if *cpu_if);
  66int __vgic_v3_perform_cpuif_access(struct kvm_vcpu *vcpu);
  67
  68#ifdef __KVM_NVHE_HYPERVISOR__
  69void __timer_enable_traps(struct kvm_vcpu *vcpu);
  70void __timer_disable_traps(struct kvm_vcpu *vcpu);
  71#endif
  72
  73#ifdef __KVM_NVHE_HYPERVISOR__
  74void __sysreg_save_state_nvhe(struct kvm_cpu_context *ctxt);
  75void __sysreg_restore_state_nvhe(struct kvm_cpu_context *ctxt);
  76#else
  77void sysreg_save_host_state_vhe(struct kvm_cpu_context *ctxt);
  78void sysreg_restore_host_state_vhe(struct kvm_cpu_context *ctxt);
  79void sysreg_save_guest_state_vhe(struct kvm_cpu_context *ctxt);
  80void sysreg_restore_guest_state_vhe(struct kvm_cpu_context *ctxt);
  81#endif
  82
  83void __debug_switch_to_guest(struct kvm_vcpu *vcpu);
  84void __debug_switch_to_host(struct kvm_vcpu *vcpu);
  85
  86#ifdef __KVM_NVHE_HYPERVISOR__
  87void __debug_save_host_buffers_nvhe(struct kvm_vcpu *vcpu);
  88void __debug_restore_host_buffers_nvhe(struct kvm_vcpu *vcpu);
  89#endif
  90
  91void __fpsimd_save_state(struct user_fpsimd_state *fp_regs);
  92void __fpsimd_restore_state(struct user_fpsimd_state *fp_regs);
  93void __sve_save_state(void *sve_pffr, u32 *fpsr);
  94void __sve_restore_state(void *sve_pffr, u32 *fpsr);
  95
  96#ifndef __KVM_NVHE_HYPERVISOR__
  97void activate_traps_vhe_load(struct kvm_vcpu *vcpu);
  98void deactivate_traps_vhe_put(struct kvm_vcpu *vcpu);
  99#endif
 100
 101u64 __guest_enter(struct kvm_vcpu *vcpu);
 102
 103bool kvm_host_psci_handler(struct kvm_cpu_context *host_ctxt);
 104
 105#ifdef __KVM_NVHE_HYPERVISOR__
 106void __noreturn __hyp_do_panic(struct kvm_cpu_context *host_ctxt, u64 spsr,
 107                               u64 elr, u64 par);
 108#endif
 109
 110#ifdef __KVM_NVHE_HYPERVISOR__
 111void __pkvm_init_switch_pgd(phys_addr_t phys, unsigned long size,
 112                            phys_addr_t pgd, void *sp, void *cont_fn);
 113int __pkvm_init(phys_addr_t phys, unsigned long size, unsigned long nr_cpus,
 114                unsigned long *per_cpu_base, u32 hyp_va_bits);
 115void __noreturn __host_enter(struct kvm_cpu_context *host_ctxt);
 116#endif
 117
 118extern u64 kvm_nvhe_sym(id_aa64mmfr0_el1_sys_val);
 119extern u64 kvm_nvhe_sym(id_aa64mmfr1_el1_sys_val);
 120
 121#endif /* __ARM64_KVM_HYP_H__ */
 122