arch/arm64/kvm/hyp/include/hyp/sysreg-sr.h

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (C) 2012-2015 - ARM Ltd
   4  * Author: Marc Zyngier <marc.zyngier@arm.com>
   5  */
   6
   7 #ifndef __ARM64_KVM_HYP_SYSREG_SR_H__
   8 #define __ARM64_KVM_HYP_SYSREG_SR_H__
   9
  10 #include <linux/compiler.h>
  11 #include <linux/kvm_host.h>
  12
  13 #include <asm/kprobes.h>
  14 #include <asm/kvm_asm.h>
  15 #include <asm/kvm_emulate.h>
  16 #include <asm/kvm_hyp.h>
  17
  18 static inline void __sysreg_save_common_state(struct kvm_cpu_context *ctxt)
  19 {
  20         ctxt_sys_reg(ctxt, MDSCR_EL1)   = read_sysreg(mdscr_el1);
  21 }
  22
  23 static inline void __sysreg_save_user_state(struct kvm_cpu_context *ctxt)
  24 {
  25         ctxt_sys_reg(ctxt, TPIDR_EL0)   = read_sysreg(tpidr_el0);
  26         ctxt_sys_reg(ctxt, TPIDRRO_EL0) = read_sysreg(tpidrro_el0);
  27 }
  28
  29 static inline void __sysreg_save_el1_state(struct kvm_cpu_context *ctxt)
  30 {
  31         ctxt_sys_reg(ctxt, CSSELR_EL1)  = read_sysreg(csselr_el1);
  32         ctxt_sys_reg(ctxt, SCTLR_EL1)   = read_sysreg_el1(SYS_SCTLR);
  33         ctxt_sys_reg(ctxt, CPACR_EL1)   = read_sysreg_el1(SYS_CPACR);
  34         ctxt_sys_reg(ctxt, TTBR0_EL1)   = read_sysreg_el1(SYS_TTBR0);
  35         ctxt_sys_reg(ctxt, TTBR1_EL1)   = read_sysreg_el1(SYS_TTBR1);
  36         ctxt_sys_reg(ctxt, TCR_EL1)     = read_sysreg_el1(SYS_TCR);
  37         ctxt_sys_reg(ctxt, ESR_EL1)     = read_sysreg_el1(SYS_ESR);
  38         ctxt_sys_reg(ctxt, AFSR0_EL1)   = read_sysreg_el1(SYS_AFSR0);
  39         ctxt_sys_reg(ctxt, AFSR1_EL1)   = read_sysreg_el1(SYS_AFSR1);
  40         ctxt_sys_reg(ctxt, FAR_EL1)     = read_sysreg_el1(SYS_FAR);
  41         ctxt_sys_reg(ctxt, MAIR_EL1)    = read_sysreg_el1(SYS_MAIR);
  42         ctxt_sys_reg(ctxt, VBAR_EL1)    = read_sysreg_el1(SYS_VBAR);
  43         ctxt_sys_reg(ctxt, CONTEXTIDR_EL1) = read_sysreg_el1(SYS_CONTEXTIDR);
  44         ctxt_sys_reg(ctxt, AMAIR_EL1)   = read_sysreg_el1(SYS_AMAIR);
  45         ctxt_sys_reg(ctxt, CNTKCTL_EL1) = read_sysreg_el1(SYS_CNTKCTL);
  46         ctxt_sys_reg(ctxt, PAR_EL1)     = read_sysreg(par_el1);
  47         ctxt_sys_reg(ctxt, TPIDR_EL1)   = read_sysreg(tpidr_el1);
  48
  49         ctxt_sys_reg(ctxt, SP_EL1)      = read_sysreg(sp_el1);
  50         ctxt_sys_reg(ctxt, ELR_EL1)     = read_sysreg_el1(SYS_ELR);
  51         ctxt_sys_reg(ctxt, SPSR_EL1)    = read_sysreg_el1(SYS_SPSR);
  52 }
  53
  54 static inline void __sysreg_save_el2_return_state(struct kvm_cpu_context *ctxt)
  55 {
  56         ctxt->regs.pc                   = read_sysreg_el2(SYS_ELR);
  57         ctxt->regs.pstate               = read_sysreg_el2(SYS_SPSR);
  58
  59         if (cpus_have_final_cap(ARM64_HAS_RAS_EXTN))
  60                 ctxt_sys_reg(ctxt, DISR_EL1) = read_sysreg_s(SYS_VDISR_EL2);
  61 }
  62
  63 static inline void __sysreg_restore_common_state(struct kvm_cpu_context *ctxt)
  64 {
  65         write_sysreg(ctxt_sys_reg(ctxt, MDSCR_EL1),  mdscr_el1);
  66 }
  67
  68 static inline void __sysreg_restore_user_state(struct kvm_cpu_context *ctxt)
  69 {
  70         write_sysreg(ctxt_sys_reg(ctxt, TPIDR_EL0),     tpidr_el0);
  71         write_sysreg(ctxt_sys_reg(ctxt, TPIDRRO_EL0),   tpidrro_el0);
  72 }
  73
  74 static inline void __sysreg_restore_el1_state(struct kvm_cpu_context *ctxt)
  75 {
  76         write_sysreg(ctxt_sys_reg(ctxt, MPIDR_EL1),     vmpidr_el2);
  77         write_sysreg(ctxt_sys_reg(ctxt, CSSELR_EL1),    csselr_el1);
  78
  79         if (has_vhe() ||
  80             !cpus_have_final_cap(ARM64_WORKAROUND_SPECULATIVE_AT)) {
  81                 write_sysreg_el1(ctxt_sys_reg(ctxt, SCTLR_EL1), SYS_SCTLR);
  82                 write_sysreg_el1(ctxt_sys_reg(ctxt, TCR_EL1),   SYS_TCR);
  83         } else  if (!ctxt->__hyp_running_vcpu) {
  84                 /*
  85                  * Must only be done for guest registers, hence the context
  86                  * test. We're coming from the host, so SCTLR.M is already
  87                  * set. Pairs with nVHE's __activate_traps().
  88                  */
  89                 write_sysreg_el1((ctxt_sys_reg(ctxt, TCR_EL1) |
  90                                   TCR_EPD1_MASK | TCR_EPD0_MASK),
  91                                  SYS_TCR);
  92                 isb();
  93         }
  94
  95         write_sysreg_el1(ctxt_sys_reg(ctxt, CPACR_EL1), SYS_CPACR);
  96         write_sysreg_el1(ctxt_sys_reg(ctxt, TTBR0_EL1), SYS_TTBR0);
  97         write_sysreg_el1(ctxt_sys_reg(ctxt, TTBR1_EL1), SYS_TTBR1);
  98         write_sysreg_el1(ctxt_sys_reg(ctxt, ESR_EL1),   SYS_ESR);
  99         write_sysreg_el1(ctxt_sys_reg(ctxt, AFSR0_EL1), SYS_AFSR0);
 100         write_sysreg_el1(ctxt_sys_reg(ctxt, AFSR1_EL1), SYS_AFSR1);
 101         write_sysreg_el1(ctxt_sys_reg(ctxt, FAR_EL1),   SYS_FAR);
 102         write_sysreg_el1(ctxt_sys_reg(ctxt, MAIR_EL1),  SYS_MAIR);
 103         write_sysreg_el1(ctxt_sys_reg(ctxt, VBAR_EL1),  SYS_VBAR);
 104         write_sysreg_el1(ctxt_sys_reg(ctxt, CONTEXTIDR_EL1), SYS_CONTEXTIDR);
 105         write_sysreg_el1(ctxt_sys_reg(ctxt, AMAIR_EL1), SYS_AMAIR);
 106         write_sysreg_el1(ctxt_sys_reg(ctxt, CNTKCTL_EL1), SYS_CNTKCTL);
 107         write_sysreg(ctxt_sys_reg(ctxt, PAR_EL1),       par_el1);
 108         write_sysreg(ctxt_sys_reg(ctxt, TPIDR_EL1),     tpidr_el1);
 109
 110         if (!has_vhe() &&
 111             cpus_have_final_cap(ARM64_WORKAROUND_SPECULATIVE_AT) &&
 112             ctxt->__hyp_running_vcpu) {
 113                 /*
 114                  * Must only be done for host registers, hence the context
 115                  * test. Pairs with nVHE's __deactivate_traps().
 116                  */
 117                 isb();
 118                 /*
 119                  * At this stage, and thanks to the above isb(), S2 is
 120                  * deconfigured and disabled. We can now restore the host's
 121                  * S1 configuration: SCTLR, and only then TCR.
 122                  */
 123                 write_sysreg_el1(ctxt_sys_reg(ctxt, SCTLR_EL1), SYS_SCTLR);
 124                 isb();
 125                 write_sysreg_el1(ctxt_sys_reg(ctxt, TCR_EL1),   SYS_TCR);
 126         }
 127
 128         write_sysreg(ctxt_sys_reg(ctxt, SP_EL1),        sp_el1);
 129         write_sysreg_el1(ctxt_sys_reg(ctxt, ELR_EL1),   SYS_ELR);
 130         write_sysreg_el1(ctxt_sys_reg(ctxt, SPSR_EL1),  SYS_SPSR);
 131 }
 132
 133 static inline void __sysreg_restore_el2_return_state(struct kvm_cpu_context *ctxt)
 134 {
 135         u64 pstate = ctxt->regs.pstate;
 136         u64 mode = pstate & PSR_AA32_MODE_MASK;
 137
 138         /*
 139          * Safety check to ensure we're setting the CPU up to enter the guest
 140          * in a less privileged mode.
 141          *
 142          * If we are attempting a return to EL2 or higher in AArch64 state,
 143          * program SPSR_EL2 with M=EL2h and the IL bit set which ensures that
 144          * we'll take an illegal exception state exception immediately after
 145          * the ERET to the guest.  Attempts to return to AArch32 Hyp will
 146          * result in an illegal exception return because EL2's execution state
 147          * is determined by SCR_EL3.RW.
 148          */
 149         if (!(mode & PSR_MODE32_BIT) && mode >= PSR_MODE_EL2t)
 150                 pstate = PSR_MODE_EL2h | PSR_IL_BIT;
 151
 152         write_sysreg_el2(ctxt->regs.pc,                 SYS_ELR);
 153         write_sysreg_el2(pstate,                        SYS_SPSR);
 154
 155         if (cpus_have_final_cap(ARM64_HAS_RAS_EXTN))
 156                 write_sysreg_s(ctxt_sys_reg(ctxt, DISR_EL1), SYS_VDISR_EL2);
 157 }
 158
 159 static inline void __sysreg32_save_state(struct kvm_vcpu *vcpu)
 160 {
 161         if (!vcpu_el1_is_32bit(vcpu))
 162                 return;
 163
 164         vcpu->arch.ctxt.spsr_abt = read_sysreg(spsr_abt);
 165         vcpu->arch.ctxt.spsr_und = read_sysreg(spsr_und);
 166         vcpu->arch.ctxt.spsr_irq = read_sysreg(spsr_irq);
 167         vcpu->arch.ctxt.spsr_fiq = read_sysreg(spsr_fiq);
 168
 169         __vcpu_sys_reg(vcpu, DACR32_EL2) = read_sysreg(dacr32_el2);
 170         __vcpu_sys_reg(vcpu, IFSR32_EL2) = read_sysreg(ifsr32_el2);
 171
 172         if (has_vhe() || vcpu->arch.flags & KVM_ARM64_DEBUG_DIRTY)
 173                 __vcpu_sys_reg(vcpu, DBGVCR32_EL2) = read_sysreg(dbgvcr32_el2);
 174 }
 175
 176 static inline void __sysreg32_restore_state(struct kvm_vcpu *vcpu)
 177 {
 178         if (!vcpu_el1_is_32bit(vcpu))
 179                 return;
 180
 181         write_sysreg(vcpu->arch.ctxt.spsr_abt, spsr_abt);
 182         write_sysreg(vcpu->arch.ctxt.spsr_und, spsr_und);
 183         write_sysreg(vcpu->arch.ctxt.spsr_irq, spsr_irq);
 184         write_sysreg(vcpu->arch.ctxt.spsr_fiq, spsr_fiq);
 185
 186         write_sysreg(__vcpu_sys_reg(vcpu, DACR32_EL2), dacr32_el2);
 187         write_sysreg(__vcpu_sys_reg(vcpu, IFSR32_EL2), ifsr32_el2);
 188
 189         if (has_vhe() || vcpu->arch.flags & KVM_ARM64_DEBUG_DIRTY)
 190                 write_sysreg(__vcpu_sys_reg(vcpu, DBGVCR32_EL2), dbgvcr32_el2);
 191 }
 192
 193 #endif /* __ARM64_KVM_HYP_SYSREG_SR_H__ */