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41 results

inject_fault.c

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  • Forked from hardware-enablement / Rockchip upstream enablement efforts / linux
    Source project has a limited visibility.
    inject_fault.c 5.45 KiB
    /*
     * Fault injection for both 32 and 64bit guests.
     *
     * Copyright (C) 2012,2013 - ARM Ltd
     * Author: Marc Zyngier <marc.zyngier@arm.com>
     *
     * Based on arch/arm/kvm/emulate.c
     * Copyright (C) 2012 - Virtual Open Systems and Columbia University
     * Author: Christoffer Dall <c.dall@virtualopensystems.com>
     *
     * This program is free software: you can redistribute it and/or modify
     * it under the terms of the GNU General Public License version 2 as
     * published by the Free Software Foundation.
     *
     * This program is distributed in the hope that it will be useful,
     * but WITHOUT ANY WARRANTY; without even the implied warranty of
     * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
     * GNU General Public License for more details.
     *
     * You should have received a copy of the GNU General Public License
     * along with this program.  If not, see <http://www.gnu.org/licenses/>.
     */
    
    #include <linux/kvm_host.h>
    #include <asm/kvm_emulate.h>
    #include <asm/esr.h>
    
    #define PSTATE_FAULT_BITS_64 	(PSR_MODE_EL1h | PSR_A_BIT | PSR_F_BIT | \
    				 PSR_I_BIT | PSR_D_BIT)
    #define EL1_EXCEPT_SYNC_OFFSET	0x200
    
    static void prepare_fault32(struct kvm_vcpu *vcpu, u32 mode, u32 vect_offset)
    {
    	unsigned long cpsr;
    	unsigned long new_spsr_value = *vcpu_cpsr(vcpu);
    	bool is_thumb = (new_spsr_value & COMPAT_PSR_T_BIT);
    	u32 return_offset = (is_thumb) ? 4 : 0;
    	u32 sctlr = vcpu_cp15(vcpu, c1_SCTLR);
    
    	cpsr = mode | COMPAT_PSR_I_BIT;
    
    	if (sctlr & (1 << 30))
    		cpsr |= COMPAT_PSR_T_BIT;
    	if (sctlr & (1 << 25))
    		cpsr |= COMPAT_PSR_E_BIT;
    
    	*vcpu_cpsr(vcpu) = cpsr;
    
    	/* Note: These now point to the banked copies */
    	*vcpu_spsr(vcpu) = new_spsr_value;
    	*vcpu_reg32(vcpu, 14) = *vcpu_pc(vcpu) + return_offset;
    
    	/* Branch to exception vector */
    	if (sctlr & (1 << 13))
    		vect_offset += 0xffff0000;
    	else /* always have security exceptions */
    		vect_offset += vcpu_cp15(vcpu, c12_VBAR);
    
    	*vcpu_pc(vcpu) = vect_offset;
    }
    
    static void inject_undef32(struct kvm_vcpu *vcpu)
    {
    	prepare_fault32(vcpu, COMPAT_PSR_MODE_UND, 4);
    }
    
    /*
     * Modelled after TakeDataAbortException() and TakePrefetchAbortException
     * pseudocode.
     */
    static void inject_abt32(struct kvm_vcpu *vcpu, bool is_pabt,
    			 unsigned long addr)
    {
    	u32 vect_offset;
    	u32 *far, *fsr;
    	bool is_lpae;
    
    	if (is_pabt) {
    		vect_offset = 12;
    		far = &vcpu_cp15(vcpu, c6_IFAR);
    		fsr = &vcpu_cp15(vcpu, c5_IFSR);
    	} else { /* !iabt */
    		vect_offset = 16;
    		far = &vcpu_cp15(vcpu, c6_DFAR);
    		fsr = &vcpu_cp15(vcpu, c5_DFSR);
    	}
    
    	prepare_fault32(vcpu, COMPAT_PSR_MODE_ABT | COMPAT_PSR_A_BIT, vect_offset);
    
    	*far = addr;
    
    	/* Give the guest an IMPLEMENTATION DEFINED exception */
    	is_lpae = (vcpu_cp15(vcpu, c2_TTBCR) >> 31);
    	if (is_lpae)
    		*fsr = 1 << 9 | 0x34;
    	else
    		*fsr = 0x14;
    }
    
    static void inject_abt64(struct kvm_vcpu *vcpu, bool is_iabt, unsigned long addr)
    {
    	unsigned long cpsr = *vcpu_cpsr(vcpu);
    	bool is_aarch32;
    	u32 esr = 0;
    
    	is_aarch32 = vcpu_mode_is_32bit(vcpu);
    
    	*vcpu_spsr(vcpu) = cpsr;
    	*vcpu_elr_el1(vcpu) = *vcpu_pc(vcpu);
    
    	*vcpu_cpsr(vcpu) = PSTATE_FAULT_BITS_64;
    	*vcpu_pc(vcpu) = vcpu_sys_reg(vcpu, VBAR_EL1) + EL1_EXCEPT_SYNC_OFFSET;
    
    	vcpu_sys_reg(vcpu, FAR_EL1) = addr;
    
    	/*
    	 * Build an {i,d}abort, depending on the level and the
    	 * instruction set. Report an external synchronous abort.
    	 */
    	if (kvm_vcpu_trap_il_is32bit(vcpu))
    		esr |= ESR_ELx_IL;
    
    	/*
    	 * Here, the guest runs in AArch64 mode when in EL1. If we get
    	 * an AArch32 fault, it means we managed to trap an EL0 fault.
    	 */
    	if (is_aarch32 || (cpsr & PSR_MODE_MASK) == PSR_MODE_EL0t)
    		esr |= (ESR_ELx_EC_IABT_LOW << ESR_ELx_EC_SHIFT);
    	else
    		esr |= (ESR_ELx_EC_IABT_CUR << ESR_ELx_EC_SHIFT);
    
    	if (!is_iabt)
    		esr |= ESR_ELx_EC_DABT_LOW;
    
    	vcpu_sys_reg(vcpu, ESR_EL1) = esr | ESR_ELx_FSC_EXTABT;
    }
    
    static void inject_undef64(struct kvm_vcpu *vcpu)
    {
    	unsigned long cpsr = *vcpu_cpsr(vcpu);
    	u32 esr = (ESR_ELx_EC_UNKNOWN << ESR_ELx_EC_SHIFT);
    
    	*vcpu_spsr(vcpu) = cpsr;
    	*vcpu_elr_el1(vcpu) = *vcpu_pc(vcpu);
    
    	*vcpu_cpsr(vcpu) = PSTATE_FAULT_BITS_64;
    	*vcpu_pc(vcpu) = vcpu_sys_reg(vcpu, VBAR_EL1) + EL1_EXCEPT_SYNC_OFFSET;
    
    	/*
    	 * Build an unknown exception, depending on the instruction
    	 * set.
    	 */
    	if (kvm_vcpu_trap_il_is32bit(vcpu))
    		esr |= ESR_ELx_IL;
    
    	vcpu_sys_reg(vcpu, ESR_EL1) = esr;
    }
    
    /**
     * kvm_inject_dabt - inject a data abort into the guest
     * @vcpu: The VCPU to receive the undefined exception
     * @addr: The address to report in the DFAR
     *
     * It is assumed that this code is called from the VCPU thread and that the
     * VCPU therefore is not currently executing guest code.
     */
    void kvm_inject_dabt(struct kvm_vcpu *vcpu, unsigned long addr)
    {
    	if (!(vcpu->arch.hcr_el2 & HCR_RW))
    		inject_abt32(vcpu, false, addr);
    	else
    		inject_abt64(vcpu, false, addr);
    }
    
    /**
     * kvm_inject_pabt - inject a prefetch abort into the guest
     * @vcpu: The VCPU to receive the undefined exception
     * @addr: The address to report in the DFAR
     *
     * It is assumed that this code is called from the VCPU thread and that the
     * VCPU therefore is not currently executing guest code.
     */
    void kvm_inject_pabt(struct kvm_vcpu *vcpu, unsigned long addr)
    {
    	if (!(vcpu->arch.hcr_el2 & HCR_RW))
    		inject_abt32(vcpu, true, addr);
    	else
    		inject_abt64(vcpu, true, addr);
    }
    
    /**
     * kvm_inject_undefined - inject an undefined instruction into the guest
     *
     * It is assumed that this code is called from the VCPU thread and that the
     * VCPU therefore is not currently executing guest code.
     */
    void kvm_inject_undefined(struct kvm_vcpu *vcpu)
    {
    	if (!(vcpu->arch.hcr_el2 & HCR_RW))
    		inject_undef32(vcpu);
    	else
    		inject_undef64(vcpu);
    }