diff options
Diffstat (limited to '')
| -rw-r--r-- | arch/arm64/include/asm/kvm_emulate.h | 531 |
1 files changed, 531 insertions, 0 deletions
diff --git a/arch/arm64/include/asm/kvm_emulate.h b/arch/arm64/include/asm/kvm_emulate.h new file mode 100644 index 000000000..4bca3d10a --- /dev/null +++ b/arch/arm64/include/asm/kvm_emulate.h @@ -0,0 +1,531 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * Copyright (C) 2012,2013 - ARM Ltd + * Author: Marc Zyngier <marc.zyngier@arm.com> + * + * Derived from arch/arm/include/kvm_emulate.h + * Copyright (C) 2012 - Virtual Open Systems and Columbia University + * Author: Christoffer Dall <c.dall@virtualopensystems.com> + */ + +#ifndef __ARM64_KVM_EMULATE_H__ +#define __ARM64_KVM_EMULATE_H__ + +#include <linux/kvm_host.h> + +#include <asm/debug-monitors.h> +#include <asm/esr.h> +#include <asm/kvm_arm.h> +#include <asm/kvm_hyp.h> +#include <asm/ptrace.h> +#include <asm/cputype.h> +#include <asm/virt.h> + +unsigned long *vcpu_reg32(const struct kvm_vcpu *vcpu, u8 reg_num); +unsigned long vcpu_read_spsr32(const struct kvm_vcpu *vcpu); +void vcpu_write_spsr32(struct kvm_vcpu *vcpu, unsigned long v); + +bool kvm_condition_valid32(const struct kvm_vcpu *vcpu); +void kvm_skip_instr32(struct kvm_vcpu *vcpu, bool is_wide_instr); + +void kvm_inject_undefined(struct kvm_vcpu *vcpu); +void kvm_inject_vabt(struct kvm_vcpu *vcpu); +void kvm_inject_dabt(struct kvm_vcpu *vcpu, unsigned long addr); +void kvm_inject_pabt(struct kvm_vcpu *vcpu, unsigned long addr); +void kvm_inject_undef32(struct kvm_vcpu *vcpu); +void kvm_inject_dabt32(struct kvm_vcpu *vcpu, unsigned long addr); +void kvm_inject_pabt32(struct kvm_vcpu *vcpu, unsigned long addr); + +static __always_inline bool vcpu_el1_is_32bit(struct kvm_vcpu *vcpu) +{ + return !(vcpu->arch.hcr_el2 & HCR_RW); +} + +static inline void vcpu_reset_hcr(struct kvm_vcpu *vcpu) +{ + vcpu->arch.hcr_el2 = HCR_GUEST_FLAGS; + if (is_kernel_in_hyp_mode()) + vcpu->arch.hcr_el2 |= HCR_E2H; + if (cpus_have_const_cap(ARM64_HAS_RAS_EXTN)) { + /* route synchronous external abort exceptions to EL2 */ + vcpu->arch.hcr_el2 |= HCR_TEA; + /* trap error record accesses */ + vcpu->arch.hcr_el2 |= HCR_TERR; + } + + if (cpus_have_const_cap(ARM64_HAS_STAGE2_FWB)) { + vcpu->arch.hcr_el2 |= HCR_FWB; + } else { + /* + * For non-FWB CPUs, we trap VM ops (HCR_EL2.TVM) until M+C + * get set in SCTLR_EL1 such that we can detect when the guest + * MMU gets turned on and do the necessary cache maintenance + * then. + */ + vcpu->arch.hcr_el2 |= HCR_TVM; + } + + if (test_bit(KVM_ARM_VCPU_EL1_32BIT, vcpu->arch.features)) + vcpu->arch.hcr_el2 &= ~HCR_RW; + + /* + * TID3: trap feature register accesses that we virtualise. + * For now this is conditional, since no AArch32 feature regs + * are currently virtualised. + */ + if (!vcpu_el1_is_32bit(vcpu)) + vcpu->arch.hcr_el2 |= HCR_TID3; + + if (cpus_have_const_cap(ARM64_MISMATCHED_CACHE_TYPE) || + vcpu_el1_is_32bit(vcpu)) + vcpu->arch.hcr_el2 |= HCR_TID2; +} + +static inline unsigned long *vcpu_hcr(struct kvm_vcpu *vcpu) +{ + return (unsigned long *)&vcpu->arch.hcr_el2; +} + +static inline void vcpu_clear_wfx_traps(struct kvm_vcpu *vcpu) +{ + vcpu->arch.hcr_el2 &= ~HCR_TWE; + if (atomic_read(&vcpu->arch.vgic_cpu.vgic_v3.its_vpe.vlpi_count) || + vcpu->kvm->arch.vgic.nassgireq) + vcpu->arch.hcr_el2 &= ~HCR_TWI; + else + vcpu->arch.hcr_el2 |= HCR_TWI; +} + +static inline void vcpu_set_wfx_traps(struct kvm_vcpu *vcpu) +{ + vcpu->arch.hcr_el2 |= HCR_TWE; + vcpu->arch.hcr_el2 |= HCR_TWI; +} + +static inline void vcpu_ptrauth_enable(struct kvm_vcpu *vcpu) +{ + vcpu->arch.hcr_el2 |= (HCR_API | HCR_APK); +} + +static inline void vcpu_ptrauth_disable(struct kvm_vcpu *vcpu) +{ + vcpu->arch.hcr_el2 &= ~(HCR_API | HCR_APK); +} + +static inline unsigned long vcpu_get_vsesr(struct kvm_vcpu *vcpu) +{ + return vcpu->arch.vsesr_el2; +} + +static inline void vcpu_set_vsesr(struct kvm_vcpu *vcpu, u64 vsesr) +{ + vcpu->arch.vsesr_el2 = vsesr; +} + +static __always_inline unsigned long *vcpu_pc(const struct kvm_vcpu *vcpu) +{ + return (unsigned long *)&vcpu_gp_regs(vcpu)->pc; +} + +static __always_inline unsigned long *vcpu_cpsr(const struct kvm_vcpu *vcpu) +{ + return (unsigned long *)&vcpu_gp_regs(vcpu)->pstate; +} + +static __always_inline bool vcpu_mode_is_32bit(const struct kvm_vcpu *vcpu) +{ + return !!(*vcpu_cpsr(vcpu) & PSR_MODE32_BIT); +} + +static __always_inline bool kvm_condition_valid(const struct kvm_vcpu *vcpu) +{ + if (vcpu_mode_is_32bit(vcpu)) + return kvm_condition_valid32(vcpu); + + return true; +} + +static inline void vcpu_set_thumb(struct kvm_vcpu *vcpu) +{ + *vcpu_cpsr(vcpu) |= PSR_AA32_T_BIT; +} + +/* + * vcpu_get_reg and vcpu_set_reg should always be passed a register number + * coming from a read of ESR_EL2. Otherwise, it may give the wrong result on + * AArch32 with banked registers. + */ +static __always_inline unsigned long vcpu_get_reg(const struct kvm_vcpu *vcpu, + u8 reg_num) +{ + return (reg_num == 31) ? 0 : vcpu_gp_regs(vcpu)->regs[reg_num]; +} + +static __always_inline void vcpu_set_reg(struct kvm_vcpu *vcpu, u8 reg_num, + unsigned long val) +{ + if (reg_num != 31) + vcpu_gp_regs(vcpu)->regs[reg_num] = val; +} + +static inline unsigned long vcpu_read_spsr(const struct kvm_vcpu *vcpu) +{ + if (vcpu_mode_is_32bit(vcpu)) + return vcpu_read_spsr32(vcpu); + + if (vcpu->arch.sysregs_loaded_on_cpu) + return read_sysreg_el1(SYS_SPSR); + else + return __vcpu_sys_reg(vcpu, SPSR_EL1); +} + +static inline void vcpu_write_spsr(struct kvm_vcpu *vcpu, unsigned long v) +{ + if (vcpu_mode_is_32bit(vcpu)) { + vcpu_write_spsr32(vcpu, v); + return; + } + + if (vcpu->arch.sysregs_loaded_on_cpu) + write_sysreg_el1(v, SYS_SPSR); + else + __vcpu_sys_reg(vcpu, SPSR_EL1) = v; +} + +/* + * The layout of SPSR for an AArch32 state is different when observed from an + * AArch64 SPSR_ELx or an AArch32 SPSR_*. This function generates the AArch32 + * view given an AArch64 view. + * + * In ARM DDI 0487E.a see: + * + * - The AArch64 view (SPSR_EL2) in section C5.2.18, page C5-426 + * - The AArch32 view (SPSR_abt) in section G8.2.126, page G8-6256 + * - The AArch32 view (SPSR_und) in section G8.2.132, page G8-6280 + * + * Which show the following differences: + * + * | Bit | AA64 | AA32 | Notes | + * +-----+------+------+-----------------------------| + * | 24 | DIT | J | J is RES0 in ARMv8 | + * | 21 | SS | DIT | SS doesn't exist in AArch32 | + * + * ... and all other bits are (currently) common. + */ +static inline unsigned long host_spsr_to_spsr32(unsigned long spsr) +{ + const unsigned long overlap = BIT(24) | BIT(21); + unsigned long dit = !!(spsr & PSR_AA32_DIT_BIT); + + spsr &= ~overlap; + + spsr |= dit << 21; + + return spsr; +} + +static inline bool vcpu_mode_priv(const struct kvm_vcpu *vcpu) +{ + u32 mode; + + if (vcpu_mode_is_32bit(vcpu)) { + mode = *vcpu_cpsr(vcpu) & PSR_AA32_MODE_MASK; + return mode > PSR_AA32_MODE_USR; + } + + mode = *vcpu_cpsr(vcpu) & PSR_MODE_MASK; + + return mode != PSR_MODE_EL0t; +} + +static __always_inline u32 kvm_vcpu_get_esr(const struct kvm_vcpu *vcpu) +{ + return vcpu->arch.fault.esr_el2; +} + +static __always_inline int kvm_vcpu_get_condition(const struct kvm_vcpu *vcpu) +{ + u32 esr = kvm_vcpu_get_esr(vcpu); + + if (esr & ESR_ELx_CV) + return (esr & ESR_ELx_COND_MASK) >> ESR_ELx_COND_SHIFT; + + return -1; +} + +static __always_inline unsigned long kvm_vcpu_get_hfar(const struct kvm_vcpu *vcpu) +{ + return vcpu->arch.fault.far_el2; +} + +static __always_inline phys_addr_t kvm_vcpu_get_fault_ipa(const struct kvm_vcpu *vcpu) +{ + return ((phys_addr_t)vcpu->arch.fault.hpfar_el2 & HPFAR_MASK) << 8; +} + +static inline u64 kvm_vcpu_get_disr(const struct kvm_vcpu *vcpu) +{ + return vcpu->arch.fault.disr_el1; +} + +static inline u32 kvm_vcpu_hvc_get_imm(const struct kvm_vcpu *vcpu) +{ + return kvm_vcpu_get_esr(vcpu) & ESR_ELx_xVC_IMM_MASK; +} + +static __always_inline bool kvm_vcpu_dabt_isvalid(const struct kvm_vcpu *vcpu) +{ + return !!(kvm_vcpu_get_esr(vcpu) & ESR_ELx_ISV); +} + +static inline unsigned long kvm_vcpu_dabt_iss_nisv_sanitized(const struct kvm_vcpu *vcpu) +{ + return kvm_vcpu_get_esr(vcpu) & (ESR_ELx_CM | ESR_ELx_WNR | ESR_ELx_FSC); +} + +static inline bool kvm_vcpu_dabt_issext(const struct kvm_vcpu *vcpu) +{ + return !!(kvm_vcpu_get_esr(vcpu) & ESR_ELx_SSE); +} + +static inline bool kvm_vcpu_dabt_issf(const struct kvm_vcpu *vcpu) +{ + return !!(kvm_vcpu_get_esr(vcpu) & ESR_ELx_SF); +} + +static __always_inline int kvm_vcpu_dabt_get_rd(const struct kvm_vcpu *vcpu) +{ + return (kvm_vcpu_get_esr(vcpu) & ESR_ELx_SRT_MASK) >> ESR_ELx_SRT_SHIFT; +} + +static __always_inline bool kvm_vcpu_abt_iss1tw(const struct kvm_vcpu *vcpu) +{ + return !!(kvm_vcpu_get_esr(vcpu) & ESR_ELx_S1PTW); +} + +/* Always check for S1PTW *before* using this. */ +static __always_inline bool kvm_vcpu_dabt_iswrite(const struct kvm_vcpu *vcpu) +{ + return kvm_vcpu_get_esr(vcpu) & ESR_ELx_WNR; +} + +static inline bool kvm_vcpu_dabt_is_cm(const struct kvm_vcpu *vcpu) +{ + return !!(kvm_vcpu_get_esr(vcpu) & ESR_ELx_CM); +} + +static __always_inline unsigned int kvm_vcpu_dabt_get_as(const struct kvm_vcpu *vcpu) +{ + return 1 << ((kvm_vcpu_get_esr(vcpu) & ESR_ELx_SAS) >> ESR_ELx_SAS_SHIFT); +} + +/* This one is not specific to Data Abort */ +static __always_inline bool kvm_vcpu_trap_il_is32bit(const struct kvm_vcpu *vcpu) +{ + return !!(kvm_vcpu_get_esr(vcpu) & ESR_ELx_IL); +} + +static __always_inline u8 kvm_vcpu_trap_get_class(const struct kvm_vcpu *vcpu) +{ + return ESR_ELx_EC(kvm_vcpu_get_esr(vcpu)); +} + +static inline bool kvm_vcpu_trap_is_iabt(const struct kvm_vcpu *vcpu) +{ + return kvm_vcpu_trap_get_class(vcpu) == ESR_ELx_EC_IABT_LOW; +} + +static inline bool kvm_vcpu_trap_is_exec_fault(const struct kvm_vcpu *vcpu) +{ + return kvm_vcpu_trap_is_iabt(vcpu) && !kvm_vcpu_abt_iss1tw(vcpu); +} + +static __always_inline u8 kvm_vcpu_trap_get_fault(const struct kvm_vcpu *vcpu) +{ + return kvm_vcpu_get_esr(vcpu) & ESR_ELx_FSC; +} + +static __always_inline u8 kvm_vcpu_trap_get_fault_type(const struct kvm_vcpu *vcpu) +{ + return kvm_vcpu_get_esr(vcpu) & ESR_ELx_FSC_TYPE; +} + +static __always_inline u8 kvm_vcpu_trap_get_fault_level(const struct kvm_vcpu *vcpu) +{ + return kvm_vcpu_get_esr(vcpu) & ESR_ELx_FSC_LEVEL; +} + +static __always_inline bool kvm_vcpu_abt_issea(const struct kvm_vcpu *vcpu) +{ + switch (kvm_vcpu_trap_get_fault(vcpu)) { + case FSC_SEA: + case FSC_SEA_TTW0: + case FSC_SEA_TTW1: + case FSC_SEA_TTW2: + case FSC_SEA_TTW3: + case FSC_SECC: + case FSC_SECC_TTW0: + case FSC_SECC_TTW1: + case FSC_SECC_TTW2: + case FSC_SECC_TTW3: + return true; + default: + return false; + } +} + +static __always_inline int kvm_vcpu_sys_get_rt(struct kvm_vcpu *vcpu) +{ + u32 esr = kvm_vcpu_get_esr(vcpu); + return ESR_ELx_SYS64_ISS_RT(esr); +} + +static inline bool kvm_is_write_fault(struct kvm_vcpu *vcpu) +{ + if (kvm_vcpu_abt_iss1tw(vcpu)) { + /* + * Only a permission fault on a S1PTW should be + * considered as a write. Otherwise, page tables baked + * in a read-only memslot will result in an exception + * being delivered in the guest. + * + * The drawback is that we end-up faulting twice if the + * guest is using any of HW AF/DB: a translation fault + * to map the page containing the PT (read only at + * first), then a permission fault to allow the flags + * to be set. + */ + switch (kvm_vcpu_trap_get_fault_type(vcpu)) { + case ESR_ELx_FSC_PERM: + return true; + default: + return false; + } + } + + if (kvm_vcpu_trap_is_iabt(vcpu)) + return false; + + return kvm_vcpu_dabt_iswrite(vcpu); +} + +static inline unsigned long kvm_vcpu_get_mpidr_aff(struct kvm_vcpu *vcpu) +{ + return vcpu_read_sys_reg(vcpu, MPIDR_EL1) & MPIDR_HWID_BITMASK; +} + +static inline void kvm_vcpu_set_be(struct kvm_vcpu *vcpu) +{ + if (vcpu_mode_is_32bit(vcpu)) { + *vcpu_cpsr(vcpu) |= PSR_AA32_E_BIT; + } else { + u64 sctlr = vcpu_read_sys_reg(vcpu, SCTLR_EL1); + sctlr |= (1 << 25); + vcpu_write_sys_reg(vcpu, sctlr, SCTLR_EL1); + } +} + +static inline bool kvm_vcpu_is_be(struct kvm_vcpu *vcpu) +{ + if (vcpu_mode_is_32bit(vcpu)) + return !!(*vcpu_cpsr(vcpu) & PSR_AA32_E_BIT); + + return !!(vcpu_read_sys_reg(vcpu, SCTLR_EL1) & (1 << 25)); +} + +static inline unsigned long vcpu_data_guest_to_host(struct kvm_vcpu *vcpu, + unsigned long data, + unsigned int len) +{ + if (kvm_vcpu_is_be(vcpu)) { + switch (len) { + case 1: + return data & 0xff; + case 2: + return be16_to_cpu(data & 0xffff); + case 4: + return be32_to_cpu(data & 0xffffffff); + default: + return be64_to_cpu(data); + } + } else { + switch (len) { + case 1: + return data & 0xff; + case 2: + return le16_to_cpu(data & 0xffff); + case 4: + return le32_to_cpu(data & 0xffffffff); + default: + return le64_to_cpu(data); + } + } + + return data; /* Leave LE untouched */ +} + +static inline unsigned long vcpu_data_host_to_guest(struct kvm_vcpu *vcpu, + unsigned long data, + unsigned int len) +{ + if (kvm_vcpu_is_be(vcpu)) { + switch (len) { + case 1: + return data & 0xff; + case 2: + return cpu_to_be16(data & 0xffff); + case 4: + return cpu_to_be32(data & 0xffffffff); + default: + return cpu_to_be64(data); + } + } else { + switch (len) { + case 1: + return data & 0xff; + case 2: + return cpu_to_le16(data & 0xffff); + case 4: + return cpu_to_le32(data & 0xffffffff); + default: + return cpu_to_le64(data); + } + } + + return data; /* Leave LE untouched */ +} + +static __always_inline void kvm_skip_instr(struct kvm_vcpu *vcpu, bool is_wide_instr) +{ + if (vcpu_mode_is_32bit(vcpu)) { + kvm_skip_instr32(vcpu, is_wide_instr); + } else { + *vcpu_pc(vcpu) += 4; + *vcpu_cpsr(vcpu) &= ~PSR_BTYPE_MASK; + } + + /* advance the singlestep state machine */ + *vcpu_cpsr(vcpu) &= ~DBG_SPSR_SS; +} + +/* + * Skip an instruction which has been emulated at hyp while most guest sysregs + * are live. + */ +static __always_inline void __kvm_skip_instr(struct kvm_vcpu *vcpu) +{ + *vcpu_pc(vcpu) = read_sysreg_el2(SYS_ELR); + vcpu_gp_regs(vcpu)->pstate = read_sysreg_el2(SYS_SPSR); + + kvm_skip_instr(vcpu, kvm_vcpu_trap_il_is32bit(vcpu)); + + write_sysreg_el2(vcpu_gp_regs(vcpu)->pstate, SYS_SPSR); + write_sysreg_el2(*vcpu_pc(vcpu), SYS_ELR); +} + +static inline bool vcpu_has_feature(struct kvm_vcpu *vcpu, int feature) +{ + return test_bit(feature, vcpu->arch.features); +} + +#endif /* __ARM64_KVM_EMULATE_H__ */ |