127 lines
3.6 KiB
C
127 lines
3.6 KiB
C
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/*
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* Fault injection for 64bit guests.
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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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* Based on arch/arm/kvm/emulate.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, see <http://www.gnu.org/licenses/>.
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*/
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#include <linux/kvm_host.h>
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#include <asm/kvm_emulate.h>
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#include <asm/esr.h>
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#define PSTATE_FAULT_BITS_64 (PSR_MODE_EL1h | PSR_A_BIT | PSR_F_BIT | \
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PSR_I_BIT | PSR_D_BIT)
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#define EL1_EXCEPT_SYNC_OFFSET 0x200
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static void inject_abt64(struct kvm_vcpu *vcpu, bool is_iabt, unsigned long addr)
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{
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unsigned long cpsr = *vcpu_cpsr(vcpu);
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bool is_aarch32;
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u32 esr = 0;
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is_aarch32 = vcpu_mode_is_32bit(vcpu);
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*vcpu_spsr(vcpu) = cpsr;
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*vcpu_elr_el1(vcpu) = *vcpu_pc(vcpu);
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*vcpu_cpsr(vcpu) = PSTATE_FAULT_BITS_64;
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*vcpu_pc(vcpu) = vcpu_sys_reg(vcpu, VBAR_EL1) + EL1_EXCEPT_SYNC_OFFSET;
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vcpu_sys_reg(vcpu, FAR_EL1) = addr;
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/*
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* Build an {i,d}abort, depending on the level and the
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* instruction set. Report an external synchronous abort.
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*/
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if (kvm_vcpu_trap_il_is32bit(vcpu))
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esr |= ESR_EL1_IL;
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/*
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* Here, the guest runs in AArch64 mode when in EL1. If we get
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* an AArch32 fault, it means we managed to trap an EL0 fault.
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*/
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if (is_aarch32 || (cpsr & PSR_MODE_MASK) == PSR_MODE_EL0t)
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esr |= (ESR_EL1_EC_IABT_EL0 << ESR_EL1_EC_SHIFT);
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else
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esr |= (ESR_EL1_EC_IABT_EL1 << ESR_EL1_EC_SHIFT);
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if (!is_iabt)
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esr |= ESR_EL1_EC_DABT_EL0;
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vcpu_sys_reg(vcpu, ESR_EL1) = esr | ESR_EL2_EC_xABT_xFSR_EXTABT;
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}
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static void inject_undef64(struct kvm_vcpu *vcpu)
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{
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unsigned long cpsr = *vcpu_cpsr(vcpu);
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u32 esr = (ESR_EL1_EC_UNKNOWN << ESR_EL1_EC_SHIFT);
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*vcpu_spsr(vcpu) = cpsr;
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*vcpu_elr_el1(vcpu) = *vcpu_pc(vcpu);
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*vcpu_cpsr(vcpu) = PSTATE_FAULT_BITS_64;
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*vcpu_pc(vcpu) = vcpu_sys_reg(vcpu, VBAR_EL1) + EL1_EXCEPT_SYNC_OFFSET;
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/*
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* Build an unknown exception, depending on the instruction
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* set.
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*/
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if (kvm_vcpu_trap_il_is32bit(vcpu))
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esr |= ESR_EL1_IL;
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vcpu_sys_reg(vcpu, ESR_EL1) = esr;
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}
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/**
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* kvm_inject_dabt - inject a data abort into the guest
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* @vcpu: The VCPU to receive the undefined exception
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* @addr: The address to report in the DFAR
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*
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* It is assumed that this code is called from the VCPU thread and that the
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* VCPU therefore is not currently executing guest code.
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*/
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void kvm_inject_dabt(struct kvm_vcpu *vcpu, unsigned long addr)
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{
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inject_abt64(vcpu, false, addr);
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}
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/**
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* kvm_inject_pabt - inject a prefetch abort into the guest
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* @vcpu: The VCPU to receive the undefined exception
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* @addr: The address to report in the DFAR
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*
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* It is assumed that this code is called from the VCPU thread and that the
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* VCPU therefore is not currently executing guest code.
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*/
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void kvm_inject_pabt(struct kvm_vcpu *vcpu, unsigned long addr)
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{
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inject_abt64(vcpu, true, addr);
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}
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/**
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* kvm_inject_undefined - inject an undefined instruction into the guest
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*
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* It is assumed that this code is called from the VCPU thread and that the
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* VCPU therefore is not currently executing guest code.
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*/
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void kvm_inject_undefined(struct kvm_vcpu *vcpu)
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{
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inject_undef64(vcpu);
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}
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