arch/arm64/kvm/hyp/sysreg-sr.c

   1 /*
   2  * Copyright (C) 2012-2015 - 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 #include <linux/compiler.h>
  19 #include <linux/kvm_host.h>
  20
  21 #include <asm/kvm_asm.h>
  22 #include <asm/kvm_mmu.h>
  23
  24 #include "hyp.h"
  25
  26 /*
  27  * Non-VHE: Both host and guest must save everything.
  28  *
  29  * VHE: Host must save tpidr*_el[01], actlr_el1, sp0, pc, pstate, and
  30  * guest must save everything.
  31  */
  32
  33 static void __hyp_text __sysreg_save_common_state(struct kvm_cpu_context *ctxt)
  34 {
  35         ctxt->sys_regs[ACTLR_EL1]       = read_sysreg(actlr_el1);
  36         ctxt->sys_regs[TPIDR_EL0]       = read_sysreg(tpidr_el0);
  37         ctxt->sys_regs[TPIDRRO_EL0]     = read_sysreg(tpidrro_el0);
  38         ctxt->sys_regs[TPIDR_EL1]       = read_sysreg(tpidr_el1);
  39         ctxt->gp_regs.regs.sp           = read_sysreg(sp_el0);
  40         ctxt->gp_regs.regs.pc           = read_sysreg_el2(elr);
  41         ctxt->gp_regs.regs.pstate       = read_sysreg_el2(spsr);
  42 }
  43
  44 static void __hyp_text __sysreg_save_state(struct kvm_cpu_context *ctxt)
  45 {
  46         ctxt->sys_regs[MPIDR_EL1]       = read_sysreg(vmpidr_el2);
  47         ctxt->sys_regs[CSSELR_EL1]      = read_sysreg(csselr_el1);
  48         ctxt->sys_regs[SCTLR_EL1]       = read_sysreg_el1(sctlr);
  49         ctxt->sys_regs[CPACR_EL1]       = read_sysreg_el1(cpacr);
  50         ctxt->sys_regs[TTBR0_EL1]       = read_sysreg_el1(ttbr0);
  51         ctxt->sys_regs[TTBR1_EL1]       = read_sysreg_el1(ttbr1);
  52         ctxt->sys_regs[TCR_EL1]         = read_sysreg_el1(tcr);
  53         ctxt->sys_regs[ESR_EL1]         = read_sysreg_el1(esr);
  54         ctxt->sys_regs[AFSR0_EL1]       = read_sysreg_el1(afsr0);
  55         ctxt->sys_regs[AFSR1_EL1]       = read_sysreg_el1(afsr1);
  56         ctxt->sys_regs[FAR_EL1]         = read_sysreg_el1(far);
  57         ctxt->sys_regs[MAIR_EL1]        = read_sysreg_el1(mair);
  58         ctxt->sys_regs[VBAR_EL1]        = read_sysreg_el1(vbar);
  59         ctxt->sys_regs[CONTEXTIDR_EL1]  = read_sysreg_el1(contextidr);
  60         ctxt->sys_regs[AMAIR_EL1]       = read_sysreg_el1(amair);
  61         ctxt->sys_regs[CNTKCTL_EL1]     = read_sysreg_el1(cntkctl);
  62         ctxt->sys_regs[PAR_EL1]         = read_sysreg(par_el1);
  63         ctxt->sys_regs[MDSCR_EL1]       = read_sysreg(mdscr_el1);
  64
  65         ctxt->gp_regs.sp_el1            = read_sysreg(sp_el1);
  66         ctxt->gp_regs.elr_el1           = read_sysreg_el1(elr);
  67         ctxt->gp_regs.spsr[KVM_SPSR_EL1]= read_sysreg_el1(spsr);
  68 }
  69
  70 void __hyp_text __sysreg_save_host_state(struct kvm_cpu_context *ctxt)
  71 {
  72         __sysreg_save_state(ctxt);
  73         __sysreg_save_common_state(ctxt);
  74 }
  75
  76 void __hyp_text __sysreg_save_guest_state(struct kvm_cpu_context *ctxt)
  77 {
  78         __sysreg_save_state(ctxt);
  79         __sysreg_save_common_state(ctxt);
  80 }
  81
  82 static void __hyp_text __sysreg_restore_common_state(struct kvm_cpu_context *ctxt)
  83 {
  84         write_sysreg(ctxt->sys_regs[ACTLR_EL1],   actlr_el1);
  85         write_sysreg(ctxt->sys_regs[TPIDR_EL0],   tpidr_el0);
  86         write_sysreg(ctxt->sys_regs[TPIDRRO_EL0], tpidrro_el0);
  87         write_sysreg(ctxt->sys_regs[TPIDR_EL1],   tpidr_el1);
  88         write_sysreg(ctxt->gp_regs.regs.sp,       sp_el0);
  89         write_sysreg_el2(ctxt->gp_regs.regs.pc,   elr);
  90         write_sysreg_el2(ctxt->gp_regs.regs.pstate, spsr);
  91 }
  92
  93 static void __hyp_text __sysreg_restore_state(struct kvm_cpu_context *ctxt)
  94 {
  95         write_sysreg(ctxt->sys_regs[MPIDR_EL1],         vmpidr_el2);
  96         write_sysreg(ctxt->sys_regs[CSSELR_EL1],        csselr_el1);
  97         write_sysreg_el1(ctxt->sys_regs[SCTLR_EL1],     sctlr);
  98         write_sysreg_el1(ctxt->sys_regs[CPACR_EL1],     cpacr);
  99         write_sysreg_el1(ctxt->sys_regs[TTBR0_EL1],     ttbr0);
 100         write_sysreg_el1(ctxt->sys_regs[TTBR1_EL1],     ttbr1);
 101         write_sysreg_el1(ctxt->sys_regs[TCR_EL1],       tcr);
 102         write_sysreg_el1(ctxt->sys_regs[ESR_EL1],       esr);
 103         write_sysreg_el1(ctxt->sys_regs[AFSR0_EL1],     afsr0);
 104         write_sysreg_el1(ctxt->sys_regs[AFSR1_EL1],     afsr1);
 105         write_sysreg_el1(ctxt->sys_regs[FAR_EL1],       far);
 106         write_sysreg_el1(ctxt->sys_regs[MAIR_EL1],      mair);
 107         write_sysreg_el1(ctxt->sys_regs[VBAR_EL1],      vbar);
 108         write_sysreg_el1(ctxt->sys_regs[CONTEXTIDR_EL1],contextidr);
 109         write_sysreg_el1(ctxt->sys_regs[AMAIR_EL1],     amair);
 110         write_sysreg_el1(ctxt->sys_regs[CNTKCTL_EL1],   cntkctl);
 111         write_sysreg(ctxt->sys_regs[PAR_EL1],           par_el1);
 112         write_sysreg(ctxt->sys_regs[MDSCR_EL1],         mdscr_el1);
 113
 114         write_sysreg(ctxt->gp_regs.sp_el1,              sp_el1);
 115         write_sysreg_el1(ctxt->gp_regs.elr_el1,         elr);
 116         write_sysreg_el1(ctxt->gp_regs.spsr[KVM_SPSR_EL1],spsr);
 117 }
 118
 119 void __hyp_text __sysreg_restore_host_state(struct kvm_cpu_context *ctxt)
 120 {
 121         __sysreg_restore_state(ctxt);
 122         __sysreg_restore_common_state(ctxt);
 123 }
 124
 125 void __hyp_text __sysreg_restore_guest_state(struct kvm_cpu_context *ctxt)
 126 {
 127         __sysreg_restore_state(ctxt);
 128         __sysreg_restore_common_state(ctxt);
 129 }
 130
 131 void __hyp_text __sysreg32_save_state(struct kvm_vcpu *vcpu)
 132 {
 133         u64 *spsr, *sysreg;
 134
 135         if (read_sysreg(hcr_el2) & HCR_RW)
 136                 return;
 137
 138         spsr = vcpu->arch.ctxt.gp_regs.spsr;
 139         sysreg = vcpu->arch.ctxt.sys_regs;
 140
 141         spsr[KVM_SPSR_ABT] = read_sysreg(spsr_abt);
 142         spsr[KVM_SPSR_UND] = read_sysreg(spsr_und);
 143         spsr[KVM_SPSR_IRQ] = read_sysreg(spsr_irq);
 144         spsr[KVM_SPSR_FIQ] = read_sysreg(spsr_fiq);
 145
 146         sysreg[DACR32_EL2] = read_sysreg(dacr32_el2);
 147         sysreg[IFSR32_EL2] = read_sysreg(ifsr32_el2);
 148
 149         if (__fpsimd_enabled())
 150                 sysreg[FPEXC32_EL2] = read_sysreg(fpexc32_el2);
 151
 152         if (vcpu->arch.debug_flags & KVM_ARM64_DEBUG_DIRTY)
 153                 sysreg[DBGVCR32_EL2] = read_sysreg(dbgvcr32_el2);
 154 }
 155
 156 void __hyp_text __sysreg32_restore_state(struct kvm_vcpu *vcpu)
 157 {
 158         u64 *spsr, *sysreg;
 159
 160         if (read_sysreg(hcr_el2) & HCR_RW)
 161                 return;
 162
 163         spsr = vcpu->arch.ctxt.gp_regs.spsr;
 164         sysreg = vcpu->arch.ctxt.sys_regs;
 165
 166         write_sysreg(spsr[KVM_SPSR_ABT], spsr_abt);
 167         write_sysreg(spsr[KVM_SPSR_UND], spsr_und);
 168         write_sysreg(spsr[KVM_SPSR_IRQ], spsr_irq);
 169         write_sysreg(spsr[KVM_SPSR_FIQ], spsr_fiq);
 170
 171         write_sysreg(sysreg[DACR32_EL2], dacr32_el2);
 172         write_sysreg(sysreg[IFSR32_EL2], ifsr32_el2);
 173
 174         if (vcpu->arch.debug_flags & KVM_ARM64_DEBUG_DIRTY)
 175                 write_sysreg(sysreg[DBGVCR32_EL2], dbgvcr32_el2);
 176 }