From mboxrd@z Thu Jan 1 00:00:00 1970 From: Marc Zyngier Subject: [PATCH v4 06/32] arm64: KVM: fault injection into a guest Date: Tue, 14 May 2013 15:13:34 +0100 Message-ID: <1368540840-26750-7-git-send-email-marc.zyngier@arm.com> References: <1368540840-26750-1-git-send-email-marc.zyngier@arm.com> Content-Type: text/plain; charset=WINDOWS-1252 Content-Transfer-Encoding: quoted-printable Cc: catalin.marinas@arm.com, will.deacon@arm.com, pbonzini@redhat.com, gleb@redhat.com, Christopher Covington To: linux-arm-kernel@lists.infradead.org, kvmarm@lists.cs.columbia.edu, kvm@vger.kernel.org Return-path: Received: from service87.mimecast.com ([91.220.42.44]:48238 "EHLO service87.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756553Ab3ENOOY (ORCPT ); Tue, 14 May 2013 10:14:24 -0400 In-Reply-To: <1368540840-26750-1-git-send-email-marc.zyngier@arm.com> Sender: kvm-owner@vger.kernel.org List-ID: Implement the injection of a fault (undefined, data abort or prefetch abort) into a 64bit guest. Reviewed-by: Christopher Covington Signed-off-by: Marc Zyngier --- arch/arm64/kvm/inject_fault.c | 126 ++++++++++++++++++++++++++++++++++++++= ++++ 1 file changed, 126 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..54f6562 --- /dev/null +++ b/arch/arm64/kvm/inject_fault.c @@ -0,0 +1,126 @@ +/* + * Fault injection for 64bit guests. + * + * Copyright (C) 2012,2013 - 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 + +#define PSTATE_FAULT_BITS_64 =09(PSR_MODE_EL1h | PSR_A_BIT | PSR_F_BIT | \ +=09=09=09=09 PSR_I_BIT | PSR_D_BIT) +#define EL1_EXCEPT_SYNC_OFFSET=090x200 + +static void inject_abt64(struct kvm_vcpu *vcpu, bool is_iabt, unsigned lon= g addr) +{ +=09unsigned long cpsr =3D *vcpu_cpsr(vcpu); +=09bool is_aarch32; +=09u32 esr =3D 0; + +=09is_aarch32 =3D vcpu_mode_is_32bit(vcpu); + +=09*vcpu_spsr(vcpu) =3D cpsr; +=09*vcpu_elr_el1(vcpu) =3D *vcpu_pc(vcpu); + +=09*vcpu_cpsr(vcpu) =3D PSTATE_FAULT_BITS_64; +=09*vcpu_pc(vcpu) =3D vcpu_sys_reg(vcpu, VBAR_EL1) + EL1_EXCEPT_SYNC_OFFSE= T; + +=09vcpu_sys_reg(vcpu, FAR_EL1) =3D addr; + +=09/* +=09 * Build an {i,d}abort, depending on the level and the +=09 * instruction set. Report an external synchronous abort. +=09 */ +=09if (kvm_vcpu_trap_il_is32bit(vcpu)) +=09=09esr |=3D ESR_EL1_IL; + +=09/* +=09 * Here, the guest runs in AArch64 mode when in EL1. If we get +=09 * an AArch32 fault, it means we managed to trap an EL0 fault. +=09 */ +=09if (is_aarch32 || (cpsr & PSR_MODE_MASK) =3D=3D PSR_MODE_EL0t) +=09=09esr |=3D (ESR_EL1_EC_IABT_EL0 << ESR_EL1_EC_SHIFT); +=09else +=09=09esr |=3D (ESR_EL1_EC_IABT_EL1 << ESR_EL1_EC_SHIFT); + +=09if (!is_iabt) +=09=09esr |=3D ESR_EL1_EC_DABT_EL0; + +=09vcpu_sys_reg(vcpu, ESR_EL1) =3D esr | ESR_EL2_EC_xABT_xFSR_EXTABT; +} + +static void inject_undef64(struct kvm_vcpu *vcpu) +{ +=09unsigned long cpsr =3D *vcpu_cpsr(vcpu); +=09u32 esr =3D (ESR_EL1_EC_UNKNOWN << ESR_EL1_EC_SHIFT); + +=09*vcpu_spsr(vcpu) =3D cpsr; +=09*vcpu_elr_el1(vcpu) =3D *vcpu_pc(vcpu); + +=09*vcpu_cpsr(vcpu) =3D PSTATE_FAULT_BITS_64; +=09*vcpu_pc(vcpu) =3D vcpu_sys_reg(vcpu, VBAR_EL1) + EL1_EXCEPT_SYNC_OFFSE= T; + +=09/* +=09 * Build an unknown exception, depending on the instruction +=09 * set. +=09 */ +=09if (kvm_vcpu_trap_il_is32bit(vcpu)) +=09=09esr |=3D ESR_EL1_IL; + +=09vcpu_sys_reg(vcpu, ESR_EL1) =3D 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 th= e + * VCPU therefore is not currently executing guest code. + */ +void kvm_inject_dabt(struct kvm_vcpu *vcpu, unsigned long addr) +{ +=09inject_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 th= e + * VCPU therefore is not currently executing guest code. + */ +void kvm_inject_pabt(struct kvm_vcpu *vcpu, unsigned long addr) +{ +=09inject_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 th= e + * VCPU therefore is not currently executing guest code. + */ +void kvm_inject_undefined(struct kvm_vcpu *vcpu) +{ +=09inject_undef64(vcpu); +} --=20 1.8.2.3