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/kvm_mmu.h>
  24 #include <asm/kvm_perf_event.h>
  25 #include <asm/sysreg.h>
  26
  27 #define __hyp_text __section(.hyp.text) notrace
  28
  29 static inline unsigned long __kern_hyp_va(unsigned long v)
  30 {
  31         asm volatile(ALTERNATIVE("and %0, %0, %1",
  32                                  "nop",
  33                                  ARM64_HAS_VIRT_HOST_EXTN)
  34                      : "+r" (v) : "i" (HYP_PAGE_OFFSET_MASK));
  35         return v;
  36 }
  37
  38 #define kern_hyp_va(v) (typeof(v))(__kern_hyp_va((unsigned long)(v)))
  39
  40 static inline unsigned long __hyp_kern_va(unsigned long v)
  41 {
  42         u64 offset = PAGE_OFFSET - HYP_PAGE_OFFSET;
  43         asm volatile(ALTERNATIVE("add %0, %0, %1",
  44                                  "nop",
  45                                  ARM64_HAS_VIRT_HOST_EXTN)
  46                      : "+r" (v) : "r" (offset));
  47         return v;
  48 }
  49
  50 #define hyp_kern_va(v) (typeof(v))(__hyp_kern_va((unsigned long)(v)))
  51
  52 #define read_sysreg_elx(r,nvh,vh)                                       \
  53         ({                                                              \
  54                 u64 reg;                                                \
  55                 asm volatile(ALTERNATIVE("mrs %0, " __stringify(r##nvh),\
  56                                          "mrs_s %0, " __stringify(r##vh),\
  57                                          ARM64_HAS_VIRT_HOST_EXTN)      \
  58                              : "=r" (reg));                             \
  59                 reg;                                                    \
  60         })
  61
  62 #define write_sysreg_elx(v,r,nvh,vh)                                    \
  63         do {                                                            \
  64                 u64 __val = (u64)(v);                                   \
  65                 asm volatile(ALTERNATIVE("msr " __stringify(r##nvh) ", %x0",\
  66                                          "msr_s " __stringify(r##vh) ", %x0",\
  67                                          ARM64_HAS_VIRT_HOST_EXTN)      \
  68                                          : : "rZ" (__val));             \
  69         } while (0)
  70
  71 /*
  72  * Unified accessors for registers that have a different encoding
  73  * between VHE and non-VHE. They must be specified without their "ELx"
  74  * encoding.
  75  */
  76 #define read_sysreg_el2(r)                                              \
  77         ({                                                              \
  78                 u64 reg;                                                \
  79                 asm volatile(ALTERNATIVE("mrs %0, " __stringify(r##_EL2),\
  80                                          "mrs %0, " __stringify(r##_EL1),\
  81                                          ARM64_HAS_VIRT_HOST_EXTN)      \
  82                              : "=r" (reg));                             \
  83                 reg;                                                    \
  84         })
  85
  86 #define write_sysreg_el2(v,r)                                           \
  87         do {                                                            \
  88                 u64 __val = (u64)(v);                                   \
  89                 asm volatile(ALTERNATIVE("msr " __stringify(r##_EL2) ", %x0",\
  90                                          "msr " __stringify(r##_EL1) ", %x0",\
  91                                          ARM64_HAS_VIRT_HOST_EXTN)      \
  92                                          : : "rZ" (__val));             \
  93         } while (0)
  94
  95 #define read_sysreg_el0(r)      read_sysreg_elx(r, _EL0, _EL02)
  96 #define write_sysreg_el0(v,r)   write_sysreg_elx(v, r, _EL0, _EL02)
  97 #define read_sysreg_el1(r)      read_sysreg_elx(r, _EL1, _EL12)
  98 #define write_sysreg_el1(v,r)   write_sysreg_elx(v, r, _EL1, _EL12)
  99
 100 /* The VHE specific system registers and their encoding */
 101 #define sctlr_EL12              sys_reg(3, 5, 1, 0, 0)
 102 #define cpacr_EL12              sys_reg(3, 5, 1, 0, 2)
 103 #define ttbr0_EL12              sys_reg(3, 5, 2, 0, 0)
 104 #define ttbr1_EL12              sys_reg(3, 5, 2, 0, 1)
 105 #define tcr_EL12                sys_reg(3, 5, 2, 0, 2)
 106 #define afsr0_EL12              sys_reg(3, 5, 5, 1, 0)
 107 #define afsr1_EL12              sys_reg(3, 5, 5, 1, 1)
 108 #define esr_EL12                sys_reg(3, 5, 5, 2, 0)
 109 #define far_EL12                sys_reg(3, 5, 6, 0, 0)
 110 #define mair_EL12               sys_reg(3, 5, 10, 2, 0)
 111 #define amair_EL12              sys_reg(3, 5, 10, 3, 0)
 112 #define vbar_EL12               sys_reg(3, 5, 12, 0, 0)
 113 #define contextidr_EL12         sys_reg(3, 5, 13, 0, 1)
 114 #define cntkctl_EL12            sys_reg(3, 5, 14, 1, 0)
 115 #define cntp_tval_EL02          sys_reg(3, 5, 14, 2, 0)
 116 #define cntp_ctl_EL02           sys_reg(3, 5, 14, 2, 1)
 117 #define cntp_cval_EL02          sys_reg(3, 5, 14, 2, 2)
 118 #define cntv_tval_EL02          sys_reg(3, 5, 14, 3, 0)
 119 #define cntv_ctl_EL02           sys_reg(3, 5, 14, 3, 1)
 120 #define cntv_cval_EL02          sys_reg(3, 5, 14, 3, 2)
 121 #define spsr_EL12               sys_reg(3, 5, 4, 0, 0)
 122 #define elr_EL12                sys_reg(3, 5, 4, 0, 1)
 123
 124 /**
 125  * hyp_alternate_select - Generates patchable code sequences that are
 126  * used to switch between two implementations of a function, depending
 127  * on the availability of a feature.
 128  *
 129  * @fname: a symbol name that will be defined as a function returning a
 130  * function pointer whose type will match @orig and @alt
 131  * @orig: A pointer to the default function, as returned by @fname when
 132  * @cond doesn't hold
 133  * @alt: A pointer to the alternate function, as returned by @fname
 134  * when @cond holds
 135  * @cond: a CPU feature (as described in asm/cpufeature.h)
 136  */
 137 #define hyp_alternate_select(fname, orig, alt, cond)                    \
 138 typeof(orig) * __hyp_text fname(void)                                   \
 139 {                                                                       \
 140         typeof(alt) *val = orig;                                        \
 141         asm volatile(ALTERNATIVE("nop           \n",                    \
 142                                  "mov   %0, %1  \n",                    \
 143                                  cond)                                  \
 144                      : "+r" (val) : "r" (alt));                         \
 145         return val;                                                     \
 146 }
 147
 148 void __vgic_v2_save_state(struct kvm_vcpu *vcpu);
 149 void __vgic_v2_restore_state(struct kvm_vcpu *vcpu);
 150
 151 void __vgic_v3_save_state(struct kvm_vcpu *vcpu);
 152 void __vgic_v3_restore_state(struct kvm_vcpu *vcpu);
 153
 154 void __timer_save_state(struct kvm_vcpu *vcpu);
 155 void __timer_restore_state(struct kvm_vcpu *vcpu);
 156
 157 void __sysreg_save_host_state(struct kvm_cpu_context *ctxt);
 158 void __sysreg_restore_host_state(struct kvm_cpu_context *ctxt);
 159 void __sysreg_save_guest_state(struct kvm_cpu_context *ctxt);
 160 void __sysreg_restore_guest_state(struct kvm_cpu_context *ctxt);
 161 void __sysreg32_save_state(struct kvm_vcpu *vcpu);
 162 void __sysreg32_restore_state(struct kvm_vcpu *vcpu);
 163
 164 void __debug_save_state(struct kvm_vcpu *vcpu,
 165                         struct kvm_guest_debug_arch *dbg,
 166                         struct kvm_cpu_context *ctxt);
 167 void __debug_restore_state(struct kvm_vcpu *vcpu,
 168                            struct kvm_guest_debug_arch *dbg,
 169                            struct kvm_cpu_context *ctxt);
 170 void __debug_cond_save_host_state(struct kvm_vcpu *vcpu);
 171 void __debug_cond_restore_host_state(struct kvm_vcpu *vcpu);
 172
 173 void __fpsimd_save_state(struct user_fpsimd_state *fp_regs);
 174 void __fpsimd_restore_state(struct user_fpsimd_state *fp_regs);
 175 bool __fpsimd_enabled(void);
 176
 177 u64 __guest_enter(struct kvm_vcpu *vcpu, struct kvm_cpu_context *host_ctxt);
 178 void __noreturn __hyp_do_panic(unsigned long, ...);
 179
 180 #endif /* __ARM64_KVM_HYP_H__ */
 181