574 lines
14 KiB
C
574 lines
14 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* Copyright (C) 2012,2013 - ARM Ltd
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* Author: Marc Zyngier <marc.zyngier@arm.com>
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*
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* Derived from arch/arm/include/kvm_emulate.h
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* Copyright (C) 2012 - Virtual Open Systems and Columbia University
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* Author: Christoffer Dall <c.dall@virtualopensystems.com>
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*/
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#ifndef __ARM64_KVM_EMULATE_H__
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#define __ARM64_KVM_EMULATE_H__
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#include <linux/kvm_host.h>
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#include <asm/debug-monitors.h>
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#include <asm/esr.h>
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#include <asm/kvm_arm.h>
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#include <asm/kvm_hyp.h>
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#include <asm/ptrace.h>
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#include <asm/cputype.h>
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#include <asm/virt.h>
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#define CURRENT_EL_SP_EL0_VECTOR 0x0
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#define CURRENT_EL_SP_ELx_VECTOR 0x200
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#define LOWER_EL_AArch64_VECTOR 0x400
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#define LOWER_EL_AArch32_VECTOR 0x600
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enum exception_type {
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except_type_sync = 0,
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except_type_irq = 0x80,
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except_type_fiq = 0x100,
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except_type_serror = 0x180,
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};
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#define kvm_exception_type_names \
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{ except_type_sync, "SYNC" }, \
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{ except_type_irq, "IRQ" }, \
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{ except_type_fiq, "FIQ" }, \
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{ except_type_serror, "SERROR" }
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bool kvm_condition_valid32(const struct kvm_vcpu *vcpu);
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void kvm_skip_instr32(struct kvm_vcpu *vcpu);
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void kvm_inject_undefined(struct kvm_vcpu *vcpu);
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void kvm_inject_vabt(struct kvm_vcpu *vcpu);
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void kvm_inject_dabt(struct kvm_vcpu *vcpu, unsigned long addr);
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void kvm_inject_pabt(struct kvm_vcpu *vcpu, unsigned long addr);
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void kvm_inject_size_fault(struct kvm_vcpu *vcpu);
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void kvm_vcpu_wfi(struct kvm_vcpu *vcpu);
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void kvm_emulate_nested_eret(struct kvm_vcpu *vcpu);
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int kvm_inject_nested_sync(struct kvm_vcpu *vcpu, u64 esr_el2);
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int kvm_inject_nested_irq(struct kvm_vcpu *vcpu);
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#if defined(__KVM_VHE_HYPERVISOR__) || defined(__KVM_NVHE_HYPERVISOR__)
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static __always_inline bool vcpu_el1_is_32bit(struct kvm_vcpu *vcpu)
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{
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return !(vcpu->arch.hcr_el2 & HCR_RW);
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}
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#else
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static __always_inline bool vcpu_el1_is_32bit(struct kvm_vcpu *vcpu)
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{
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struct kvm *kvm = vcpu->kvm;
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WARN_ON_ONCE(!test_bit(KVM_ARCH_FLAG_REG_WIDTH_CONFIGURED,
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&kvm->arch.flags));
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return test_bit(KVM_ARCH_FLAG_EL1_32BIT, &kvm->arch.flags);
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}
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#endif
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static inline void vcpu_reset_hcr(struct kvm_vcpu *vcpu)
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{
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vcpu->arch.hcr_el2 = HCR_GUEST_FLAGS;
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if (is_kernel_in_hyp_mode())
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vcpu->arch.hcr_el2 |= HCR_E2H;
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if (cpus_have_const_cap(ARM64_HAS_RAS_EXTN)) {
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/* route synchronous external abort exceptions to EL2 */
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vcpu->arch.hcr_el2 |= HCR_TEA;
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/* trap error record accesses */
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vcpu->arch.hcr_el2 |= HCR_TERR;
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}
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if (cpus_have_const_cap(ARM64_HAS_STAGE2_FWB)) {
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vcpu->arch.hcr_el2 |= HCR_FWB;
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} else {
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/*
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* For non-FWB CPUs, we trap VM ops (HCR_EL2.TVM) until M+C
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* get set in SCTLR_EL1 such that we can detect when the guest
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* MMU gets turned on and do the necessary cache maintenance
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* then.
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*/
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vcpu->arch.hcr_el2 |= HCR_TVM;
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}
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if (vcpu_el1_is_32bit(vcpu))
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vcpu->arch.hcr_el2 &= ~HCR_RW;
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if (kvm_has_mte(vcpu->kvm))
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vcpu->arch.hcr_el2 |= HCR_ATA;
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}
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static inline unsigned long *vcpu_hcr(struct kvm_vcpu *vcpu)
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{
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return (unsigned long *)&vcpu->arch.hcr_el2;
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}
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static inline void vcpu_clear_wfx_traps(struct kvm_vcpu *vcpu)
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{
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vcpu->arch.hcr_el2 &= ~HCR_TWE;
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if (atomic_read(&vcpu->arch.vgic_cpu.vgic_v3.its_vpe.vlpi_count) ||
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vcpu->kvm->arch.vgic.nassgireq)
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vcpu->arch.hcr_el2 &= ~HCR_TWI;
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else
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vcpu->arch.hcr_el2 |= HCR_TWI;
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}
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static inline void vcpu_set_wfx_traps(struct kvm_vcpu *vcpu)
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{
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vcpu->arch.hcr_el2 |= HCR_TWE;
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vcpu->arch.hcr_el2 |= HCR_TWI;
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}
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static inline void vcpu_ptrauth_enable(struct kvm_vcpu *vcpu)
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{
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vcpu->arch.hcr_el2 |= (HCR_API | HCR_APK);
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}
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static inline void vcpu_ptrauth_disable(struct kvm_vcpu *vcpu)
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{
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vcpu->arch.hcr_el2 &= ~(HCR_API | HCR_APK);
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}
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static inline unsigned long vcpu_get_vsesr(struct kvm_vcpu *vcpu)
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{
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return vcpu->arch.vsesr_el2;
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}
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static inline void vcpu_set_vsesr(struct kvm_vcpu *vcpu, u64 vsesr)
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{
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vcpu->arch.vsesr_el2 = vsesr;
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}
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static __always_inline unsigned long *vcpu_pc(const struct kvm_vcpu *vcpu)
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{
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return (unsigned long *)&vcpu_gp_regs(vcpu)->pc;
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}
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static __always_inline unsigned long *vcpu_cpsr(const struct kvm_vcpu *vcpu)
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{
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return (unsigned long *)&vcpu_gp_regs(vcpu)->pstate;
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}
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static __always_inline bool vcpu_mode_is_32bit(const struct kvm_vcpu *vcpu)
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{
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return !!(*vcpu_cpsr(vcpu) & PSR_MODE32_BIT);
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}
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static __always_inline bool kvm_condition_valid(const struct kvm_vcpu *vcpu)
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{
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if (vcpu_mode_is_32bit(vcpu))
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return kvm_condition_valid32(vcpu);
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return true;
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}
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static inline void vcpu_set_thumb(struct kvm_vcpu *vcpu)
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{
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*vcpu_cpsr(vcpu) |= PSR_AA32_T_BIT;
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}
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/*
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* vcpu_get_reg and vcpu_set_reg should always be passed a register number
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* coming from a read of ESR_EL2. Otherwise, it may give the wrong result on
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* AArch32 with banked registers.
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*/
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static __always_inline unsigned long vcpu_get_reg(const struct kvm_vcpu *vcpu,
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u8 reg_num)
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{
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return (reg_num == 31) ? 0 : vcpu_gp_regs(vcpu)->regs[reg_num];
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}
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static __always_inline void vcpu_set_reg(struct kvm_vcpu *vcpu, u8 reg_num,
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unsigned long val)
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{
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if (reg_num != 31)
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vcpu_gp_regs(vcpu)->regs[reg_num] = val;
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}
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static inline bool vcpu_is_el2_ctxt(const struct kvm_cpu_context *ctxt)
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{
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switch (ctxt->regs.pstate & (PSR_MODE32_BIT | PSR_MODE_MASK)) {
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case PSR_MODE_EL2h:
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case PSR_MODE_EL2t:
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return true;
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default:
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return false;
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}
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}
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static inline bool vcpu_is_el2(const struct kvm_vcpu *vcpu)
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{
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return vcpu_is_el2_ctxt(&vcpu->arch.ctxt);
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}
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static inline bool __vcpu_el2_e2h_is_set(const struct kvm_cpu_context *ctxt)
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{
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return ctxt_sys_reg(ctxt, HCR_EL2) & HCR_E2H;
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}
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static inline bool vcpu_el2_e2h_is_set(const struct kvm_vcpu *vcpu)
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{
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return __vcpu_el2_e2h_is_set(&vcpu->arch.ctxt);
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}
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static inline bool __vcpu_el2_tge_is_set(const struct kvm_cpu_context *ctxt)
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{
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return ctxt_sys_reg(ctxt, HCR_EL2) & HCR_TGE;
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}
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static inline bool vcpu_el2_tge_is_set(const struct kvm_vcpu *vcpu)
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{
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return __vcpu_el2_tge_is_set(&vcpu->arch.ctxt);
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}
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static inline bool __is_hyp_ctxt(const struct kvm_cpu_context *ctxt)
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{
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/*
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* We are in a hypervisor context if the vcpu mode is EL2 or
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* E2H and TGE bits are set. The latter means we are in the user space
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* of the VHE kernel. ARMv8.1 ARM describes this as 'InHost'
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*
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* Note that the HCR_EL2.{E2H,TGE}={0,1} isn't really handled in the
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* rest of the KVM code, and will result in a misbehaving guest.
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*/
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return vcpu_is_el2_ctxt(ctxt) ||
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(__vcpu_el2_e2h_is_set(ctxt) && __vcpu_el2_tge_is_set(ctxt)) ||
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__vcpu_el2_tge_is_set(ctxt);
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}
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static inline bool is_hyp_ctxt(const struct kvm_vcpu *vcpu)
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{
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return __is_hyp_ctxt(&vcpu->arch.ctxt);
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}
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/*
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* The layout of SPSR for an AArch32 state is different when observed from an
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* AArch64 SPSR_ELx or an AArch32 SPSR_*. This function generates the AArch32
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* view given an AArch64 view.
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*
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* In ARM DDI 0487E.a see:
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*
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* - The AArch64 view (SPSR_EL2) in section C5.2.18, page C5-426
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* - The AArch32 view (SPSR_abt) in section G8.2.126, page G8-6256
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* - The AArch32 view (SPSR_und) in section G8.2.132, page G8-6280
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*
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* Which show the following differences:
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*
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* | Bit | AA64 | AA32 | Notes |
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* +-----+------+------+-----------------------------|
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* | 24 | DIT | J | J is RES0 in ARMv8 |
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* | 21 | SS | DIT | SS doesn't exist in AArch32 |
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*
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* ... and all other bits are (currently) common.
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*/
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static inline unsigned long host_spsr_to_spsr32(unsigned long spsr)
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{
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const unsigned long overlap = BIT(24) | BIT(21);
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unsigned long dit = !!(spsr & PSR_AA32_DIT_BIT);
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spsr &= ~overlap;
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spsr |= dit << 21;
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return spsr;
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}
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static inline bool vcpu_mode_priv(const struct kvm_vcpu *vcpu)
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{
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u32 mode;
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if (vcpu_mode_is_32bit(vcpu)) {
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mode = *vcpu_cpsr(vcpu) & PSR_AA32_MODE_MASK;
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return mode > PSR_AA32_MODE_USR;
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}
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mode = *vcpu_cpsr(vcpu) & PSR_MODE_MASK;
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return mode != PSR_MODE_EL0t;
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}
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static __always_inline u64 kvm_vcpu_get_esr(const struct kvm_vcpu *vcpu)
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{
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return vcpu->arch.fault.esr_el2;
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}
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static __always_inline int kvm_vcpu_get_condition(const struct kvm_vcpu *vcpu)
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{
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u64 esr = kvm_vcpu_get_esr(vcpu);
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if (esr & ESR_ELx_CV)
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return (esr & ESR_ELx_COND_MASK) >> ESR_ELx_COND_SHIFT;
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return -1;
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}
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static __always_inline unsigned long kvm_vcpu_get_hfar(const struct kvm_vcpu *vcpu)
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{
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return vcpu->arch.fault.far_el2;
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}
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static __always_inline phys_addr_t kvm_vcpu_get_fault_ipa(const struct kvm_vcpu *vcpu)
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{
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return ((phys_addr_t)vcpu->arch.fault.hpfar_el2 & HPFAR_MASK) << 8;
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}
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static inline u64 kvm_vcpu_get_disr(const struct kvm_vcpu *vcpu)
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{
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return vcpu->arch.fault.disr_el1;
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}
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static inline u32 kvm_vcpu_hvc_get_imm(const struct kvm_vcpu *vcpu)
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{
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return kvm_vcpu_get_esr(vcpu) & ESR_ELx_xVC_IMM_MASK;
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}
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static __always_inline bool kvm_vcpu_dabt_isvalid(const struct kvm_vcpu *vcpu)
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{
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return !!(kvm_vcpu_get_esr(vcpu) & ESR_ELx_ISV);
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}
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static inline unsigned long kvm_vcpu_dabt_iss_nisv_sanitized(const struct kvm_vcpu *vcpu)
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{
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return kvm_vcpu_get_esr(vcpu) & (ESR_ELx_CM | ESR_ELx_WNR | ESR_ELx_FSC);
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}
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static inline bool kvm_vcpu_dabt_issext(const struct kvm_vcpu *vcpu)
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{
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return !!(kvm_vcpu_get_esr(vcpu) & ESR_ELx_SSE);
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}
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static inline bool kvm_vcpu_dabt_issf(const struct kvm_vcpu *vcpu)
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{
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return !!(kvm_vcpu_get_esr(vcpu) & ESR_ELx_SF);
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}
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static __always_inline int kvm_vcpu_dabt_get_rd(const struct kvm_vcpu *vcpu)
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{
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return (kvm_vcpu_get_esr(vcpu) & ESR_ELx_SRT_MASK) >> ESR_ELx_SRT_SHIFT;
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}
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static __always_inline bool kvm_vcpu_abt_iss1tw(const struct kvm_vcpu *vcpu)
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{
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return !!(kvm_vcpu_get_esr(vcpu) & ESR_ELx_S1PTW);
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}
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/* Always check for S1PTW *before* using this. */
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static __always_inline bool kvm_vcpu_dabt_iswrite(const struct kvm_vcpu *vcpu)
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{
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return kvm_vcpu_get_esr(vcpu) & ESR_ELx_WNR;
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}
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static inline bool kvm_vcpu_dabt_is_cm(const struct kvm_vcpu *vcpu)
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{
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return !!(kvm_vcpu_get_esr(vcpu) & ESR_ELx_CM);
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}
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static __always_inline unsigned int kvm_vcpu_dabt_get_as(const struct kvm_vcpu *vcpu)
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{
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return 1 << ((kvm_vcpu_get_esr(vcpu) & ESR_ELx_SAS) >> ESR_ELx_SAS_SHIFT);
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}
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/* This one is not specific to Data Abort */
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static __always_inline bool kvm_vcpu_trap_il_is32bit(const struct kvm_vcpu *vcpu)
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{
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return !!(kvm_vcpu_get_esr(vcpu) & ESR_ELx_IL);
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}
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static __always_inline u8 kvm_vcpu_trap_get_class(const struct kvm_vcpu *vcpu)
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{
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return ESR_ELx_EC(kvm_vcpu_get_esr(vcpu));
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}
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static inline bool kvm_vcpu_trap_is_iabt(const struct kvm_vcpu *vcpu)
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{
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return kvm_vcpu_trap_get_class(vcpu) == ESR_ELx_EC_IABT_LOW;
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}
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static inline bool kvm_vcpu_trap_is_exec_fault(const struct kvm_vcpu *vcpu)
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{
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return kvm_vcpu_trap_is_iabt(vcpu) && !kvm_vcpu_abt_iss1tw(vcpu);
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}
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static __always_inline u8 kvm_vcpu_trap_get_fault(const struct kvm_vcpu *vcpu)
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{
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return kvm_vcpu_get_esr(vcpu) & ESR_ELx_FSC;
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}
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static __always_inline u8 kvm_vcpu_trap_get_fault_type(const struct kvm_vcpu *vcpu)
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{
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return kvm_vcpu_get_esr(vcpu) & ESR_ELx_FSC_TYPE;
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}
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static __always_inline u8 kvm_vcpu_trap_get_fault_level(const struct kvm_vcpu *vcpu)
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{
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return kvm_vcpu_get_esr(vcpu) & ESR_ELx_FSC_LEVEL;
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}
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static __always_inline bool kvm_vcpu_abt_issea(const struct kvm_vcpu *vcpu)
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{
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switch (kvm_vcpu_trap_get_fault(vcpu)) {
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case ESR_ELx_FSC_EXTABT:
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case ESR_ELx_FSC_SEA_TTW0:
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case ESR_ELx_FSC_SEA_TTW1:
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case ESR_ELx_FSC_SEA_TTW2:
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case ESR_ELx_FSC_SEA_TTW3:
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case ESR_ELx_FSC_SECC:
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case ESR_ELx_FSC_SECC_TTW0:
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case ESR_ELx_FSC_SECC_TTW1:
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case ESR_ELx_FSC_SECC_TTW2:
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case ESR_ELx_FSC_SECC_TTW3:
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return true;
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default:
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return false;
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}
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}
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static __always_inline int kvm_vcpu_sys_get_rt(struct kvm_vcpu *vcpu)
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{
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u64 esr = kvm_vcpu_get_esr(vcpu);
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return ESR_ELx_SYS64_ISS_RT(esr);
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}
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static inline bool kvm_is_write_fault(struct kvm_vcpu *vcpu)
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{
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if (kvm_vcpu_abt_iss1tw(vcpu)) {
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/*
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* Only a permission fault on a S1PTW should be
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* considered as a write. Otherwise, page tables baked
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* in a read-only memslot will result in an exception
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* being delivered in the guest.
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*
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* The drawback is that we end-up faulting twice if the
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* guest is using any of HW AF/DB: a translation fault
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* 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 |= SCTLR_ELx_EE;
|
|
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);
|
|
|
|
if (vcpu_mode_priv(vcpu))
|
|
return !!(vcpu_read_sys_reg(vcpu, SCTLR_EL1) & SCTLR_ELx_EE);
|
|
else
|
|
return !!(vcpu_read_sys_reg(vcpu, SCTLR_EL1) & SCTLR_EL1_E0E);
|
|
}
|
|
|
|
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_incr_pc(struct kvm_vcpu *vcpu)
|
|
{
|
|
WARN_ON(vcpu_get_flag(vcpu, PENDING_EXCEPTION));
|
|
vcpu_set_flag(vcpu, INCREMENT_PC);
|
|
}
|
|
|
|
#define kvm_pend_exception(v, e) \
|
|
do { \
|
|
WARN_ON(vcpu_get_flag((v), INCREMENT_PC)); \
|
|
vcpu_set_flag((v), PENDING_EXCEPTION); \
|
|
vcpu_set_flag((v), e); \
|
|
} while (0)
|
|
|
|
|
|
static inline bool vcpu_has_feature(struct kvm_vcpu *vcpu, int feature)
|
|
{
|
|
return test_bit(feature, vcpu->arch.features);
|
|
}
|
|
|
|
#endif /* __ARM64_KVM_EMULATE_H__ */
|