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