arch/arm64/include/asm/kvm_hyp.h

   1 /*
   2  * Copyright (C) 2015 - ARM Ltd
   3  * Author: Marc Zyngier <marc.zyngier@arm.com>
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License version 2 as
   7  * published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  16  */
  17
  18 #ifndef __ARM64_KVM_HYP_H__
  19 #define __ARM64_KVM_HYP_H__
  20
  21 #include <linux/compiler.h>
  22 #include <linux/kvm_host.h>
  23 #include <asm/sysreg.h>
  24
  25 #define __hyp_text __section(.hyp.text) notrace
  26
  27 #define read_sysreg_elx(r,nvh,vh)                                       \
  28         ({                                                              \
  29                 u64 reg;                                                \
  30                 asm volatile(ALTERNATIVE("mrs %0, " __stringify(r##nvh),\
  31                                          "mrs_s %0, " __stringify(r##vh),\
  32                                          ARM64_HAS_VIRT_HOST_EXTN)      \
  33                              : "=r" (reg));                             \
  34                 reg;                                                    \
  35         })
  36
  37 #define write_sysreg_elx(v,r,nvh,vh)                                    \
  38         do {                                                            \
  39                 u64 __val = (u64)(v);                                   \
  40                 asm volatile(ALTERNATIVE("msr " __stringify(r##nvh) ", %x0",\
  41                                          "msr_s " __stringify(r##vh) ", %x0",\
  42                                          ARM64_HAS_VIRT_HOST_EXTN)      \
  43                                          : : "rZ" (__val));             \
  44         } while (0)
  45
  46 /*
  47  * Unified accessors for registers that have a different encoding
  48  * between VHE and non-VHE. They must be specified without their "ELx"
  49  * encoding.
  50  */
  51 #define read_sysreg_el2(r)                                              \
  52         ({                                                              \
  53                 u64 reg;                                                \
  54                 asm volatile(ALTERNATIVE("mrs %0, " __stringify(r##_EL2),\
  55                                          "mrs %0, " __stringify(r##_EL1),\
  56                                          ARM64_HAS_VIRT_HOST_EXTN)      \
  57                              : "=r" (reg));                             \
  58                 reg;                                                    \
  59         })
  60
  61 #define write_sysreg_el2(v,r)                                           \
  62         do {                                                            \
  63                 u64 __val = (u64)(v);                                   \
  64                 asm volatile(ALTERNATIVE("msr " __stringify(r##_EL2) ", %x0",\
  65                                          "msr " __stringify(r##_EL1) ", %x0",\
  66                                          ARM64_HAS_VIRT_HOST_EXTN)      \
  67                                          : : "rZ" (__val));             \
  68         } while (0)
  69
  70 #define read_sysreg_el0(r)      read_sysreg_elx(r, _EL0, _EL02)
  71 #define write_sysreg_el0(v,r)   write_sysreg_elx(v, r, _EL0, _EL02)
  72 #define read_sysreg_el1(r)      read_sysreg_elx(r, _EL1, _EL12)
  73 #define write_sysreg_el1(v,r)   write_sysreg_elx(v, r, _EL1, _EL12)
  74
  75 /* The VHE specific system registers and their encoding */
  76 #define sctlr_EL12              sys_reg(3, 5, 1, 0, 0)
  77 #define cpacr_EL12              sys_reg(3, 5, 1, 0, 2)
  78 #define ttbr0_EL12              sys_reg(3, 5, 2, 0, 0)
  79 #define ttbr1_EL12              sys_reg(3, 5, 2, 0, 1)
  80 #define tcr_EL12                sys_reg(3, 5, 2, 0, 2)
  81 #define afsr0_EL12              sys_reg(3, 5, 5, 1, 0)
  82 #define afsr1_EL12              sys_reg(3, 5, 5, 1, 1)
  83 #define esr_EL12                sys_reg(3, 5, 5, 2, 0)
  84 #define far_EL12                sys_reg(3, 5, 6, 0, 0)
  85 #define mair_EL12               sys_reg(3, 5, 10, 2, 0)
  86 #define amair_EL12              sys_reg(3, 5, 10, 3, 0)
  87 #define vbar_EL12               sys_reg(3, 5, 12, 0, 0)
  88 #define contextidr_EL12         sys_reg(3, 5, 13, 0, 1)
  89 #define cntkctl_EL12            sys_reg(3, 5, 14, 1, 0)
  90 #define cntp_tval_EL02          sys_reg(3, 5, 14, 2, 0)
  91 #define cntp_ctl_EL02           sys_reg(3, 5, 14, 2, 1)
  92 #define cntp_cval_EL02          sys_reg(3, 5, 14, 2, 2)
  93 #define cntv_tval_EL02          sys_reg(3, 5, 14, 3, 0)
  94 #define cntv_ctl_EL02           sys_reg(3, 5, 14, 3, 1)
  95 #define cntv_cval_EL02          sys_reg(3, 5, 14, 3, 2)
  96 #define spsr_EL12               sys_reg(3, 5, 4, 0, 0)
  97 #define elr_EL12                sys_reg(3, 5, 4, 0, 1)
  98
  99 /**
 100  * hyp_alternate_select - Generates patchable code sequences that are
 101  * used to switch between two implementations of a function, depending
 102  * on the availability of a feature.
 103  *
 104  * @fname: a symbol name that will be defined as a function returning a
 105  * function pointer whose type will match @orig and @alt
 106  * @orig: A pointer to the default function, as returned by @fname when
 107  * @cond doesn't hold
 108  * @alt: A pointer to the alternate function, as returned by @fname
 109  * when @cond holds
 110  * @cond: a CPU feature (as described in asm/cpufeature.h)
 111  */
 112 #define hyp_alternate_select(fname, orig, alt, cond)                    \
 113 typeof(orig) * __hyp_text fname(void)                                   \
 114 {                                                                       \
 115         typeof(alt) *val = orig;                                        \
 116         asm volatile(ALTERNATIVE("nop           \n",                    \
 117                                  "mov   %0, %1  \n",                    \
 118                                  cond)                                  \
 119                      : "+r" (val) : "r" (alt));                         \
 120         return val;                                                     \
 121 }
 122
 123 int __vgic_v2_perform_cpuif_access(struct kvm_vcpu *vcpu);
 124
 125 void __vgic_v3_save_state(struct kvm_vcpu *vcpu);
 126 void __vgic_v3_restore_state(struct kvm_vcpu *vcpu);
 127 void __vgic_v3_activate_traps(struct kvm_vcpu *vcpu);
 128 void __vgic_v3_deactivate_traps(struct kvm_vcpu *vcpu);
 129 void __vgic_v3_save_aprs(struct kvm_vcpu *vcpu);
 130 void __vgic_v3_restore_aprs(struct kvm_vcpu *vcpu);
 131 int __vgic_v3_perform_cpuif_access(struct kvm_vcpu *vcpu);
 132
 133 void __timer_enable_traps(struct kvm_vcpu *vcpu);
 134 void __timer_disable_traps(struct kvm_vcpu *vcpu);
 135
 136 void __sysreg_save_state_nvhe(struct kvm_cpu_context *ctxt);
 137 void __sysreg_restore_state_nvhe(struct kvm_cpu_context *ctxt);
 138 void sysreg_save_host_state_vhe(struct kvm_cpu_context *ctxt);
 139 void sysreg_restore_host_state_vhe(struct kvm_cpu_context *ctxt);
 140 void sysreg_save_guest_state_vhe(struct kvm_cpu_context *ctxt);
 141 void sysreg_restore_guest_state_vhe(struct kvm_cpu_context *ctxt);
 142 void __sysreg32_save_state(struct kvm_vcpu *vcpu);
 143 void __sysreg32_restore_state(struct kvm_vcpu *vcpu);
 144
 145 void __debug_switch_to_guest(struct kvm_vcpu *vcpu);
 146 void __debug_switch_to_host(struct kvm_vcpu *vcpu);
 147
 148 void __fpsimd_save_state(struct user_fpsimd_state *fp_regs);
 149 void __fpsimd_restore_state(struct user_fpsimd_state *fp_regs);
 150 bool __fpsimd_enabled(void);
 151
 152 void activate_traps_vhe_load(struct kvm_vcpu *vcpu);
 153 void deactivate_traps_vhe_put(void);
 154
 155 u64 __guest_enter(struct kvm_vcpu *vcpu, struct kvm_cpu_context *host_ctxt);
 156 void __noreturn __hyp_do_panic(unsigned long, ...);
 157
 158 /*
 159  * Must be called from hyp code running at EL2 with an updated VTTBR
 160  * and interrupts disabled.
 161  */
 162 static __always_inline void __hyp_text __load_guest_stage2(struct kvm *kvm)
 163 {
 164         write_sysreg(kvm->arch.vtcr, vtcr_el2);
 165         write_sysreg(kvm->arch.vttbr, vttbr_el2);
 166 }
 167
 168 #endif /* __ARM64_KVM_HYP_H__ */
 169