arm64: KVM: Basic ESR_EL2 helpers and vcpu register access
Implements helpers for dealing with the EL2 syndrome register as well as accessing the vcpu registers. Reviewed-by: Christopher Covington <cov@codeaurora.org> Reviewed-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>hifive-unleashed-5.1
Marc Zyngier
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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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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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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/kvm_asm.h>
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#include <asm/kvm_arm.h>
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#include <asm/kvm_mmio.h>
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#include <asm/ptrace.h>
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void kvm_inject_undefined(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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static 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)->regs.pc;
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}
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static inline unsigned long *vcpu_elr_el1(const struct kvm_vcpu *vcpu)
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{
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return (unsigned long *)&vcpu_gp_regs(vcpu)->elr_el1;
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}
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static 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)->regs.pstate;
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}
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static inline bool vcpu_mode_is_32bit(const struct kvm_vcpu *vcpu)
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{
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return false; /* 32bit? Bahhh... */
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}
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static inline bool kvm_condition_valid(const struct kvm_vcpu *vcpu)
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{
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return true; /* No conditionals on arm64 */
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}
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static inline void kvm_skip_instr(struct kvm_vcpu *vcpu, bool is_wide_instr)
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{
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*vcpu_pc(vcpu) += 4;
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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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}
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static inline unsigned long *vcpu_reg(const struct kvm_vcpu *vcpu, u8 reg_num)
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{
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return (unsigned long *)&vcpu_gp_regs(vcpu)->regs.regs[reg_num];
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}
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/* Get vcpu SPSR for current mode */
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static inline unsigned long *vcpu_spsr(const struct kvm_vcpu *vcpu)
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{
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return (unsigned long *)&vcpu_gp_regs(vcpu)->spsr[KVM_SPSR_EL1];
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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 = *vcpu_cpsr(vcpu) & PSR_MODE_MASK;
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return mode != PSR_MODE_EL0t;
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}
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static inline u32 kvm_vcpu_get_hsr(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 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 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 bool kvm_vcpu_dabt_isvalid(const struct kvm_vcpu *vcpu)
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{
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return !!(kvm_vcpu_get_hsr(vcpu) & ESR_EL2_ISV);
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}
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static inline bool kvm_vcpu_dabt_iswrite(const struct kvm_vcpu *vcpu)
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{
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return !!(kvm_vcpu_get_hsr(vcpu) & ESR_EL2_WNR);
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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_hsr(vcpu) & ESR_EL2_SSE);
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}
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static inline int kvm_vcpu_dabt_get_rd(const struct kvm_vcpu *vcpu)
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{
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return (kvm_vcpu_get_hsr(vcpu) & ESR_EL2_SRT_MASK) >> ESR_EL2_SRT_SHIFT;
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}
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static inline bool kvm_vcpu_dabt_isextabt(const struct kvm_vcpu *vcpu)
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{
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return !!(kvm_vcpu_get_hsr(vcpu) & ESR_EL2_EA);
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}
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static inline bool kvm_vcpu_dabt_iss1tw(const struct kvm_vcpu *vcpu)
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{
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return !!(kvm_vcpu_get_hsr(vcpu) & ESR_EL2_S1PTW);
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}
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static inline int kvm_vcpu_dabt_get_as(const struct kvm_vcpu *vcpu)
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{
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return 1 << ((kvm_vcpu_get_hsr(vcpu) & ESR_EL2_SAS) >> ESR_EL2_SAS_SHIFT);
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}
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/* This one is not specific to Data Abort */
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static inline bool kvm_vcpu_trap_il_is32bit(const struct kvm_vcpu *vcpu)
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{
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return !!(kvm_vcpu_get_hsr(vcpu) & ESR_EL2_IL);
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}
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static inline u8 kvm_vcpu_trap_get_class(const struct kvm_vcpu *vcpu)
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{
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return kvm_vcpu_get_hsr(vcpu) >> ESR_EL2_EC_SHIFT;
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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_EL2_EC_IABT;
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}
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static inline u8 kvm_vcpu_trap_get_fault(const struct kvm_vcpu *vcpu)
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{
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return kvm_vcpu_get_hsr(vcpu) & ESR_EL2_FSC_TYPE;
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}
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#endif /* __ARM64_KVM_EMULATE_H__ */
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