From mboxrd@z Thu Jan 1 00:00:00 1970 From: marc.zyngier@arm.com (Marc Zyngier) Date: Tue, 5 Mar 2013 03:47:22 +0000 Subject: [PATCH 06/29] arm64: KVM: fault injection into a guest In-Reply-To: <1362455265-24165-1-git-send-email-marc.zyngier@arm.com> References: <1362455265-24165-1-git-send-email-marc.zyngier@arm.com> Message-ID: <1362455265-24165-7-git-send-email-marc.zyngier@arm.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org Implement the injection of a fault (undefined, data abort or prefetch abort) into a 64bit guest. Signed-off-by: Marc Zyngier --- arch/arm64/kvm/inject_fault.c | 117 ++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 117 insertions(+) create mode 100644 arch/arm64/kvm/inject_fault.c diff --git a/arch/arm64/kvm/inject_fault.c b/arch/arm64/kvm/inject_fault.c new file mode 100644 index 0000000..80b245f --- /dev/null +++ b/arch/arm64/kvm/inject_fault.c @@ -0,0 +1,117 @@ +/* + * Fault injection for 64bit guests. + * + * Copyright (C) 2012 - ARM Ltd + * Author: Marc Zyngier + * + * Based on arch/arm/kvm/emulate.c + * Copyright (C) 2012 - Virtual Open Systems and Columbia University + * Author: Christoffer Dall + * + * 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 . + */ + +#include +#include + +static void inject_abt64(struct kvm_vcpu *vcpu, bool is_iabt, unsigned long addr) +{ + unsigned long cpsr = *vcpu_cpsr(vcpu); + int is_aarch32; + u32 esr = 0; + + is_aarch32 = vcpu_mode_is_32bit(vcpu); + + *vcpu_spsr(vcpu) = cpsr; + vcpu->arch.regs.elr_el1 = *vcpu_pc(vcpu); + + *vcpu_cpsr(vcpu) = PSR_MODE_EL1h | PSR_A_BIT | PSR_F_BIT | PSR_I_BIT; + *vcpu_pc(vcpu) = vcpu->arch.sys_regs[VBAR_EL1] + 0x200; + + vcpu->arch.sys_regs[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 |= (1 << 25); + + if (is_aarch32 || (cpsr & PSR_MODE_MASK) == PSR_MODE_EL0t) + esr |= (0x20 << 26); + else + esr |= (0x21 << 26); + + if (!is_iabt) + esr |= (1 << 28); + + vcpu->arch.sys_regs[ESR_EL1] = esr | 0x10; +} + +static void inject_undef64(struct kvm_vcpu *vcpu) +{ + unsigned long cpsr = *vcpu_cpsr(vcpu); + u32 esr = 0; + + *vcpu_spsr(vcpu) = cpsr; + vcpu->arch.regs.elr_el1 = *vcpu_pc(vcpu); + + *vcpu_cpsr(vcpu) = PSR_MODE_EL1h | PSR_F_BIT | PSR_I_BIT; + *vcpu_pc(vcpu) = vcpu->arch.sys_regs[VBAR_EL1] + 0x200; + + /* + * Build an unknown exception, depending on the instruction + * set. + */ + if (kvm_vcpu_trap_il_is32bit(vcpu)) + esr |= (1 << 25); + + vcpu->arch.sys_regs[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) +{ + 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) +{ + inject_abt64(vcpu, true, addr); +} + +/** + * kvm_inject_undefined - inject a 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) +{ + inject_undef64(vcpu); +} -- 1.7.12.4