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-rw-r--r--kernel/arch/arm64/kvm/handle_exit.c147
1 files changed, 147 insertions, 0 deletions
diff --git a/kernel/arch/arm64/kvm/handle_exit.c b/kernel/arch/arm64/kvm/handle_exit.c
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+++ b/kernel/arch/arm64/kvm/handle_exit.c
@@ -0,0 +1,147 @@
+/*
+ * Copyright (C) 2012,2013 - ARM Ltd
+ * Author: Marc Zyngier <marc.zyngier@arm.com>
+ *
+ * Derived from arch/arm/kvm/handle_exit.c:
+ * Copyright (C) 2012 - Virtual Open Systems and Columbia University
+ * Author: Christoffer Dall <c.dall@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.h>
+#include <linux/kvm_host.h>
+
+#include <asm/esr.h>
+#include <asm/kvm_coproc.h>
+#include <asm/kvm_emulate.h>
+#include <asm/kvm_mmu.h>
+#include <asm/kvm_psci.h>
+
+#define CREATE_TRACE_POINTS
+#include "trace.h"
+
+typedef int (*exit_handle_fn)(struct kvm_vcpu *, struct kvm_run *);
+
+static int handle_hvc(struct kvm_vcpu *vcpu, struct kvm_run *run)
+{
+ int ret;
+
+ trace_kvm_hvc_arm64(*vcpu_pc(vcpu), *vcpu_reg(vcpu, 0),
+ kvm_vcpu_hvc_get_imm(vcpu));
+
+ ret = kvm_psci_call(vcpu);
+ if (ret < 0) {
+ kvm_inject_undefined(vcpu);
+ return 1;
+ }
+
+ return ret;
+}
+
+static int handle_smc(struct kvm_vcpu *vcpu, struct kvm_run *run)
+{
+ kvm_inject_undefined(vcpu);
+ return 1;
+}
+
+/**
+ * kvm_handle_wfx - handle a wait-for-interrupts or wait-for-event
+ * instruction executed by a guest
+ *
+ * @vcpu: the vcpu pointer
+ *
+ * WFE: Yield the CPU and come back to this vcpu when the scheduler
+ * decides to.
+ * WFI: Simply call kvm_vcpu_block(), which will halt execution of
+ * world-switches and schedule other host processes until there is an
+ * incoming IRQ or FIQ to the VM.
+ */
+static int kvm_handle_wfx(struct kvm_vcpu *vcpu, struct kvm_run *run)
+{
+ if (kvm_vcpu_get_hsr(vcpu) & ESR_ELx_WFx_ISS_WFE) {
+ trace_kvm_wfx_arm64(*vcpu_pc(vcpu), true);
+ kvm_vcpu_on_spin(vcpu);
+ } else {
+ trace_kvm_wfx_arm64(*vcpu_pc(vcpu), false);
+ kvm_vcpu_block(vcpu);
+ }
+
+ kvm_skip_instr(vcpu, kvm_vcpu_trap_il_is32bit(vcpu));
+
+ return 1;
+}
+
+static exit_handle_fn arm_exit_handlers[] = {
+ [ESR_ELx_EC_WFx] = kvm_handle_wfx,
+ [ESR_ELx_EC_CP15_32] = kvm_handle_cp15_32,
+ [ESR_ELx_EC_CP15_64] = kvm_handle_cp15_64,
+ [ESR_ELx_EC_CP14_MR] = kvm_handle_cp14_32,
+ [ESR_ELx_EC_CP14_LS] = kvm_handle_cp14_load_store,
+ [ESR_ELx_EC_CP14_64] = kvm_handle_cp14_64,
+ [ESR_ELx_EC_HVC32] = handle_hvc,
+ [ESR_ELx_EC_SMC32] = handle_smc,
+ [ESR_ELx_EC_HVC64] = handle_hvc,
+ [ESR_ELx_EC_SMC64] = handle_smc,
+ [ESR_ELx_EC_SYS64] = kvm_handle_sys_reg,
+ [ESR_ELx_EC_IABT_LOW] = kvm_handle_guest_abort,
+ [ESR_ELx_EC_DABT_LOW] = kvm_handle_guest_abort,
+};
+
+static exit_handle_fn kvm_get_exit_handler(struct kvm_vcpu *vcpu)
+{
+ u32 hsr = kvm_vcpu_get_hsr(vcpu);
+ u8 hsr_ec = hsr >> ESR_ELx_EC_SHIFT;
+
+ if (hsr_ec >= ARRAY_SIZE(arm_exit_handlers) ||
+ !arm_exit_handlers[hsr_ec]) {
+ kvm_err("Unknown exception class: hsr: %#08x -- %s\n",
+ hsr, esr_get_class_string(hsr));
+ BUG();
+ }
+
+ return arm_exit_handlers[hsr_ec];
+}
+
+/*
+ * Return > 0 to return to guest, < 0 on error, 0 (and set exit_reason) on
+ * proper exit to userspace.
+ */
+int handle_exit(struct kvm_vcpu *vcpu, struct kvm_run *run,
+ int exception_index)
+{
+ exit_handle_fn exit_handler;
+
+ switch (exception_index) {
+ case ARM_EXCEPTION_IRQ:
+ return 1;
+ case ARM_EXCEPTION_TRAP:
+ /*
+ * See ARM ARM B1.14.1: "Hyp traps on instructions
+ * that fail their condition code check"
+ */
+ if (!kvm_condition_valid(vcpu)) {
+ kvm_skip_instr(vcpu, kvm_vcpu_trap_il_is32bit(vcpu));
+ return 1;
+ }
+
+ exit_handler = kvm_get_exit_handler(vcpu);
+
+ return exit_handler(vcpu, run);
+ default:
+ kvm_pr_unimpl("Unsupported exception type: %d",
+ exception_index);
+ run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
+ return 0;
+ }
+}