[PATCH v2 07/30] arm64: KVM: fault injection into a guest
Marc Zyngier
marc.zyngier at arm.com
Tue Mar 26 13:01:02 EDT 2013
Implement the injection of a fault (undefined, data abort or
prefetch abort) into a 64bit guest.
Signed-off-by: Marc Zyngier <marc.zyngier at arm.com>
---
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 <marc.zyngier at arm.com>
+ *
+ * Based on arch/arm/kvm/emulate.c
+ * Copyright (C) 2012 - Virtual Open Systems and Columbia University
+ * Author: Christoffer Dall <c.dall at 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>
+
+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);
+}
--
1.8.1.4
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