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@@ -0,0 +1,140 @@
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+/*
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+ * Copyright (C) 2012 - Virtual Open Systems and Columbia University
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+ * Author: Christoffer Dall <c.dall@virtualopensystems.com>
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+ *
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+ * This program is free software; you can redistribute it and/or modify
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+ * it under the terms of the GNU General Public License, version 2, as
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+ * published by the Free Software Foundation.
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+ *
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+ * This program is distributed in the hope that it will be useful,
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+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
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+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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+ * GNU General Public License for more details.
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+ *
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+ * You should have received a copy of the GNU General Public License
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+ * along with this program; if not, write to the Free Software
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+ * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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+ */
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+
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+#include <linux/kvm.h>
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+#include <linux/kvm_host.h>
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+#include <asm/kvm_emulate.h>
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+#include <asm/kvm_coproc.h>
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+#include <asm/kvm_mmu.h>
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+#include <asm/kvm_psci.h>
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+
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+typedef int (*exit_handle_fn)(struct kvm_vcpu *, struct kvm_run *);
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+
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+static int handle_svc_hyp(struct kvm_vcpu *vcpu, struct kvm_run *run)
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+{
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+ /* SVC called from Hyp mode should never get here */
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+ kvm_debug("SVC called from Hyp mode shouldn't go here\n");
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+ BUG();
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+ return -EINVAL; /* Squash warning */
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+}
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+
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+static int handle_hvc(struct kvm_vcpu *vcpu, struct kvm_run *run)
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+{
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+ if (kvm_psci_call(vcpu))
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+ return 1;
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+
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+ kvm_inject_undefined(vcpu);
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+ return 1;
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+}
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+
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+static int handle_smc(struct kvm_vcpu *vcpu, struct kvm_run *run)
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+{
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+ if (kvm_psci_call(vcpu))
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+ return 1;
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+
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+ kvm_inject_undefined(vcpu);
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+ return 1;
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+}
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+
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+static int handle_pabt_hyp(struct kvm_vcpu *vcpu, struct kvm_run *run)
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+{
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+ /* The hypervisor should never cause aborts */
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+ kvm_err("Prefetch Abort taken from Hyp mode at %#08lx (HSR: %#08x)\n",
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+ kvm_vcpu_get_hfar(vcpu), kvm_vcpu_get_hsr(vcpu));
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+ return -EFAULT;
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+}
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+
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+static int handle_dabt_hyp(struct kvm_vcpu *vcpu, struct kvm_run *run)
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+{
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+ /* This is either an error in the ws. code or an external abort */
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+ kvm_err("Data Abort taken from Hyp mode at %#08lx (HSR: %#08x)\n",
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+ kvm_vcpu_get_hfar(vcpu), kvm_vcpu_get_hsr(vcpu));
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+ return -EFAULT;
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+}
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+
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+static exit_handle_fn arm_exit_handlers[] = {
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+ [HSR_EC_WFI] = kvm_handle_wfi,
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+ [HSR_EC_CP15_32] = kvm_handle_cp15_32,
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+ [HSR_EC_CP15_64] = kvm_handle_cp15_64,
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+ [HSR_EC_CP14_MR] = kvm_handle_cp14_access,
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+ [HSR_EC_CP14_LS] = kvm_handle_cp14_load_store,
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+ [HSR_EC_CP14_64] = kvm_handle_cp14_access,
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+ [HSR_EC_CP_0_13] = kvm_handle_cp_0_13_access,
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+ [HSR_EC_CP10_ID] = kvm_handle_cp10_id,
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+ [HSR_EC_SVC_HYP] = handle_svc_hyp,
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+ [HSR_EC_HVC] = handle_hvc,
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+ [HSR_EC_SMC] = handle_smc,
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+ [HSR_EC_IABT] = kvm_handle_guest_abort,
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+ [HSR_EC_IABT_HYP] = handle_pabt_hyp,
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+ [HSR_EC_DABT] = kvm_handle_guest_abort,
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+ [HSR_EC_DABT_HYP] = handle_dabt_hyp,
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+};
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+
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+static exit_handle_fn kvm_get_exit_handler(struct kvm_vcpu *vcpu)
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+{
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+ u8 hsr_ec = kvm_vcpu_trap_get_class(vcpu);
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+
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+ if (hsr_ec >= ARRAY_SIZE(arm_exit_handlers) ||
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+ !arm_exit_handlers[hsr_ec]) {
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+ kvm_err("Unkown exception class: hsr: %#08x\n",
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+ (unsigned int)kvm_vcpu_get_hsr(vcpu));
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+ BUG();
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+ }
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+
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+ return arm_exit_handlers[hsr_ec];
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+}
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+
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+/*
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+ * Return > 0 to return to guest, < 0 on error, 0 (and set exit_reason) on
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+ * proper exit to userspace.
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+ */
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+int handle_exit(struct kvm_vcpu *vcpu, struct kvm_run *run,
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+ int exception_index)
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+{
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+ exit_handle_fn exit_handler;
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+
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+ switch (exception_index) {
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+ case ARM_EXCEPTION_IRQ:
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+ return 1;
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+ case ARM_EXCEPTION_UNDEFINED:
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+ kvm_err("Undefined exception in Hyp mode at: %#08lx\n",
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+ kvm_vcpu_get_hyp_pc(vcpu));
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+ BUG();
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+ panic("KVM: Hypervisor undefined exception!\n");
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+ case ARM_EXCEPTION_DATA_ABORT:
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+ case ARM_EXCEPTION_PREF_ABORT:
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+ case ARM_EXCEPTION_HVC:
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+ /*
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+ * See ARM ARM B1.14.1: "Hyp traps on instructions
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+ * that fail their condition code check"
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+ */
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+ if (!kvm_condition_valid(vcpu)) {
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+ kvm_skip_instr(vcpu, kvm_vcpu_trap_il_is32bit(vcpu));
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+ return 1;
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+ }
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+
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+ exit_handler = kvm_get_exit_handler(vcpu);
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+
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+ return exit_handler(vcpu, run);
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+ default:
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+ kvm_pr_unimpl("Unsupported exception type: %d",
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+ exception_index);
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+ run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
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+ return 0;
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+ }
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+}
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Marc Zyngier