arch/arm64/include/asm/kvm_nested.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef __ARM64_KVM_NESTED_H
   3 #define __ARM64_KVM_NESTED_H
   4
   5 #include <linux/bitfield.h>
   6 #include <linux/kvm_host.h>
   7 #include <asm/kvm_emulate.h>
   8
   9 static inline bool vcpu_has_nv(const struct kvm_vcpu *vcpu)
  10 {
  11         return (!__is_defined(__KVM_NVHE_HYPERVISOR__) &&
  12                 cpus_have_final_cap(ARM64_HAS_NESTED_VIRT) &&
  13                 vcpu_has_feature(vcpu, KVM_ARM_VCPU_HAS_EL2));
  14 }
  15
  16 /* Translation helpers from non-VHE EL2 to EL1 */
  17 static inline u64 tcr_el2_ps_to_tcr_el1_ips(u64 tcr_el2)
  18 {
  19         return (u64)FIELD_GET(TCR_EL2_PS_MASK, tcr_el2) << TCR_IPS_SHIFT;
  20 }
  21
  22 static inline u64 translate_tcr_el2_to_tcr_el1(u64 tcr)
  23 {
  24         return TCR_EPD1_MASK |                          /* disable TTBR1_EL1 */
  25                ((tcr & TCR_EL2_TBI) ? TCR_TBI0 : 0) |
  26                tcr_el2_ps_to_tcr_el1_ips(tcr) |
  27                (tcr & TCR_EL2_TG0_MASK) |
  28                (tcr & TCR_EL2_ORGN0_MASK) |
  29                (tcr & TCR_EL2_IRGN0_MASK) |
  30                (tcr & TCR_EL2_T0SZ_MASK);
  31 }
  32
  33 static inline u64 translate_cptr_el2_to_cpacr_el1(u64 cptr_el2)
  34 {
  35         u64 cpacr_el1 = 0;
  36
  37         if (cptr_el2 & CPTR_EL2_TTA)
  38                 cpacr_el1 |= CPACR_ELx_TTA;
  39         if (!(cptr_el2 & CPTR_EL2_TFP))
  40                 cpacr_el1 |= CPACR_ELx_FPEN;
  41         if (!(cptr_el2 & CPTR_EL2_TZ))
  42                 cpacr_el1 |= CPACR_ELx_ZEN;
  43
  44         return cpacr_el1;
  45 }
  46
  47 static inline u64 translate_sctlr_el2_to_sctlr_el1(u64 val)
  48 {
  49         /* Only preserve the minimal set of bits we support */
  50         val &= (SCTLR_ELx_M | SCTLR_ELx_A | SCTLR_ELx_C | SCTLR_ELx_SA |
  51                 SCTLR_ELx_I | SCTLR_ELx_IESB | SCTLR_ELx_WXN | SCTLR_ELx_EE);
  52         val |= SCTLR_EL1_RES1;
  53
  54         return val;
  55 }
  56
  57 static inline u64 translate_ttbr0_el2_to_ttbr0_el1(u64 ttbr0)
  58 {
  59         /* Clear the ASID field */
  60         return ttbr0 & ~GENMASK_ULL(63, 48);
  61 }
  62
  63
  64 int kvm_init_nv_sysregs(struct kvm *kvm);
  65
  66 #endif /* __ARM64_KVM_NESTED_H */