forked from Minki/linux
8734f16fb2
Admitedly, reading a MMIO register to load PC is very weird. Writing PC to a MMIO register is probably even worse. But the architecture doesn't forbid any of these, and injecting a Prefetch Abort is the wrong thing to do anyway. Remove this check altogether, and let the adventurous guest wander into LaLaLand if they feel compelled to do so. Reported-by: Catalin Marinas <catalin.marinas@arm.com> Acked-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com> Signed-off-by: Christoffer Dall <cdall@cs.columbia.edu>
161 lines
4.1 KiB
C
161 lines
4.1 KiB
C
/*
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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, write to the Free Software
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* Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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#ifndef __ARM_KVM_EMULATE_H__
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#define __ARM_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_mmio.h>
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#include <asm/kvm_arm.h>
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unsigned long *vcpu_reg(struct kvm_vcpu *vcpu, u8 reg_num);
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unsigned long *vcpu_spsr(struct kvm_vcpu *vcpu);
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bool kvm_condition_valid(struct kvm_vcpu *vcpu);
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void kvm_skip_instr(struct kvm_vcpu *vcpu, bool is_wide_instr);
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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 bool vcpu_mode_is_32bit(struct kvm_vcpu *vcpu)
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{
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return 1;
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}
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static inline unsigned long *vcpu_pc(struct kvm_vcpu *vcpu)
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{
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return &vcpu->arch.regs.usr_regs.ARM_pc;
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}
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static inline unsigned long *vcpu_cpsr(struct kvm_vcpu *vcpu)
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{
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return &vcpu->arch.regs.usr_regs.ARM_cpsr;
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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_T_BIT;
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}
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static inline bool mode_has_spsr(struct kvm_vcpu *vcpu)
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{
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unsigned long cpsr_mode = vcpu->arch.regs.usr_regs.ARM_cpsr & MODE_MASK;
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return (cpsr_mode > USR_MODE && cpsr_mode < SYSTEM_MODE);
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}
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static inline bool vcpu_mode_priv(struct kvm_vcpu *vcpu)
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{
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unsigned long cpsr_mode = vcpu->arch.regs.usr_regs.ARM_cpsr & MODE_MASK;
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return cpsr_mode > USR_MODE;;
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}
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static inline u32 kvm_vcpu_get_hsr(struct kvm_vcpu *vcpu)
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{
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return vcpu->arch.fault.hsr;
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}
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static inline unsigned long kvm_vcpu_get_hfar(struct kvm_vcpu *vcpu)
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{
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return vcpu->arch.fault.hxfar;
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}
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static inline phys_addr_t kvm_vcpu_get_fault_ipa(struct kvm_vcpu *vcpu)
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{
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return ((phys_addr_t)vcpu->arch.fault.hpfar & HPFAR_MASK) << 8;
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}
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static inline unsigned long kvm_vcpu_get_hyp_pc(struct kvm_vcpu *vcpu)
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{
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return vcpu->arch.fault.hyp_pc;
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}
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static inline bool kvm_vcpu_dabt_isvalid(struct kvm_vcpu *vcpu)
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{
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return kvm_vcpu_get_hsr(vcpu) & HSR_ISV;
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}
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static inline bool kvm_vcpu_dabt_iswrite(struct kvm_vcpu *vcpu)
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{
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return kvm_vcpu_get_hsr(vcpu) & HSR_WNR;
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}
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static inline bool kvm_vcpu_dabt_issext(struct kvm_vcpu *vcpu)
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{
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return kvm_vcpu_get_hsr(vcpu) & HSR_SSE;
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}
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static inline int kvm_vcpu_dabt_get_rd(struct kvm_vcpu *vcpu)
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{
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return (kvm_vcpu_get_hsr(vcpu) & HSR_SRT_MASK) >> HSR_SRT_SHIFT;
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}
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static inline bool kvm_vcpu_dabt_isextabt(struct kvm_vcpu *vcpu)
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{
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return kvm_vcpu_get_hsr(vcpu) & HSR_DABT_EA;
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}
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static inline bool kvm_vcpu_dabt_iss1tw(struct kvm_vcpu *vcpu)
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{
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return kvm_vcpu_get_hsr(vcpu) & HSR_DABT_S1PTW;
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}
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/* Get Access Size from a data abort */
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static inline int kvm_vcpu_dabt_get_as(struct kvm_vcpu *vcpu)
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{
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switch ((kvm_vcpu_get_hsr(vcpu) >> 22) & 0x3) {
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case 0:
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return 1;
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case 1:
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return 2;
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case 2:
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return 4;
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default:
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kvm_err("Hardware is weird: SAS 0b11 is reserved\n");
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return -EFAULT;
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}
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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(struct kvm_vcpu *vcpu)
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{
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return kvm_vcpu_get_hsr(vcpu) & HSR_IL;
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}
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static inline u8 kvm_vcpu_trap_get_class(struct kvm_vcpu *vcpu)
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{
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return kvm_vcpu_get_hsr(vcpu) >> HSR_EC_SHIFT;
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}
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static inline bool kvm_vcpu_trap_is_iabt(struct kvm_vcpu *vcpu)
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{
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return kvm_vcpu_trap_get_class(vcpu) == HSR_EC_IABT;
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}
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static inline u8 kvm_vcpu_trap_get_fault(struct kvm_vcpu *vcpu)
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{
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return kvm_vcpu_get_hsr(vcpu) & HSR_FSC_TYPE;
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}
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static inline u32 kvm_vcpu_hvc_get_imm(struct kvm_vcpu *vcpu)
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{
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return kvm_vcpu_get_hsr(vcpu) & HSR_HVC_IMM_MASK;
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}
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#endif /* __ARM_KVM_EMULATE_H__ */
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