From patchwork Tue Mar 26 17:01:02 2013 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Marc Zyngier X-Patchwork-Id: 2341061 Return-Path: X-Original-To: patchwork-kvm@patchwork.kernel.org Delivered-To: patchwork-process-083081@patchwork1.kernel.org Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by patchwork1.kernel.org (Postfix) with ESMTP id 3667A3FD40 for ; Tue, 26 Mar 2013 17:02:09 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752418Ab3CZRBy (ORCPT ); Tue, 26 Mar 2013 13:01:54 -0400 Received: from service87.mimecast.com ([91.220.42.44]:39426 "EHLO service87.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752354Ab3CZRBx (ORCPT ); Tue, 26 Mar 2013 13:01:53 -0400 Received: from cam-owa2.Emea.Arm.com (fw-tnat.cambridge.arm.com [217.140.96.21]) by service87.mimecast.com; Tue, 26 Mar 2013 17:01:50 +0000 Received: from e102391-lin.cambridge.arm.com ([10.1.255.212]) by cam-owa2.Emea.Arm.com with Microsoft SMTPSVC(6.0.3790.3959); Tue, 26 Mar 2013 17:01:35 +0000 From: Marc Zyngier To: linux-arm-kernel@lists.infradead.org, kvm@vger.kernel.org, kvmarm@lists.cs.columbia.edu Cc: catalin.marinas@arm.com, will.deacon@arm.com Subject: [PATCH v2 07/30] arm64: KVM: fault injection into a guest Date: Tue, 26 Mar 2013 17:01:02 +0000 Message-Id: <1364317285-20937-8-git-send-email-marc.zyngier@arm.com> X-Mailer: git-send-email 1.8.1.4 In-Reply-To: <1364317285-20937-1-git-send-email-marc.zyngier@arm.com> References: <1364317285-20937-1-git-send-email-marc.zyngier@arm.com> X-OriginalArrivalTime: 26 Mar 2013 17:01:35.0356 (UTC) FILETIME=[92C013C0:01CE2A43] X-MC-Unique: 113032617015067901 Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.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 | 118 ++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 118 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..3f784b8 --- /dev/null +++ b/arch/arm64/kvm/inject_fault.c @@ -0,0 +1,118 @@ +/* + * 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 +#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_elr_el1(vcpu) = *vcpu_pc(vcpu); + + *vcpu_cpsr(vcpu) = PSR_MODE_EL1h | PSR_A_BIT | PSR_F_BIT | PSR_I_BIT; + *vcpu_pc(vcpu) = vcpu_sys_reg(vcpu, VBAR_EL1) + 0x200; + + 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_EL1_IL; + + if (is_aarch32 || (cpsr & PSR_MODE_MASK) == PSR_MODE_EL0t) + esr |= (ESR_EL1_EC_IABT_EL0 << ESR_EL1_EC_SHIFT); + else + esr |= (ESR_EL1_EC_IABT_EL1 << ESR_EL1_EC_SHIFT); + + if (!is_iabt) + esr |= ESR_EL1_EC_DABT_EL0; + + vcpu_sys_reg(vcpu, ESR_EL1) = esr | 0x10; /* External abort */ +} + +static void inject_undef64(struct kvm_vcpu *vcpu) +{ + unsigned long cpsr = *vcpu_cpsr(vcpu); + u32 esr = (ESR_EL1_EC_UNKNOWN << ESR_EL1_EC_SHIFT); + + *vcpu_spsr(vcpu) = cpsr; + *vcpu_elr_el1(vcpu) = *vcpu_pc(vcpu); + + *vcpu_cpsr(vcpu) = PSR_MODE_EL1h | PSR_F_BIT | PSR_I_BIT; + *vcpu_pc(vcpu) = vcpu_sys_reg(vcpu, VBAR_EL1) + 0x200; + + /* + * Build an unknown exception, depending on the instruction + * set. + */ + if (kvm_vcpu_trap_il_is32bit(vcpu)) + esr |= ESR_EL1_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) +{ + 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 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) +{ + inject_undef64(vcpu); +}