arm64: KVM: Exit handling

Handle the exit of a VM, decoding the exit reason from HYP mode
and calling the corresponding handler.

Reviewed-by: Christopher Covington <cov@codeaurora.org>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>

1 files changed, 119 insertions, 0 deletions

diff --git a/arch/arm64/kvm/handle_exit.c b/arch/arm64/kvm/handle_exit.c
new file mode 100644
index 000000000000..c65d1154f969
--- /dev/null
+++ b/arch/arm64/kvm/handle_exit.c
@@ -0,0 +1,119 @@
+/*
+ * 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/kvm_emulate.h>
+#include <asm/kvm_coproc.h>
+#include <asm/kvm_mmu.h>
+
+typedef int (*exit_handle_fn)(struct kvm_vcpu *, struct kvm_run *);
+
+static int handle_hvc(struct kvm_vcpu *vcpu, struct kvm_run *run)
+{
+        /*
+         * Guest called HVC instruction:
+         * Let it know we don't want that by injecting an undefined exception.
+         */
+        kvm_debug("hvc: %x (at %08lx)", kvm_vcpu_get_hsr(vcpu) & ((1 << 16) - 1),
+                  *vcpu_pc(vcpu));
+        kvm_debug("         HSR: %8x", kvm_vcpu_get_hsr(vcpu));
+        kvm_inject_undefined(vcpu);
+        return 1;
+}
+
+static int handle_smc(struct kvm_vcpu *vcpu, struct kvm_run *run)
+{
+        /* We don't support SMC; don't do that. */
+        kvm_debug("smc: at %08lx", *vcpu_pc(vcpu));
+        kvm_inject_undefined(vcpu);
+        return 1;
+}
+
+/**
+ * kvm_handle_wfi - handle a wait-for-interrupts instruction executed by a guest
+ * @vcpu:       the vcpu pointer
+ *
+ * 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_wfi(struct kvm_vcpu *vcpu, struct kvm_run *run)
+{
+        kvm_vcpu_block(vcpu);
+        return 1;
+}
+
+static exit_handle_fn arm_exit_handlers[] = {
+        [ESR_EL2_EC_WFI]        = kvm_handle_wfi,
+        [ESR_EL2_EC_HVC64]      = handle_hvc,
+        [ESR_EL2_EC_SMC64]      = handle_smc,
+        [ESR_EL2_EC_SYS64]      = kvm_handle_sys_reg,
+        [ESR_EL2_EC_IABT]       = kvm_handle_guest_abort,
+        [ESR_EL2_EC_DABT]       = kvm_handle_guest_abort,
+};
+
+static exit_handle_fn kvm_get_exit_handler(struct kvm_vcpu *vcpu)
+{
+        u8 hsr_ec = kvm_vcpu_trap_get_class(vcpu);
+
+        if (hsr_ec >= ARRAY_SIZE(arm_exit_handlers) ||
+            !arm_exit_handlers[hsr_ec]) {
+                kvm_err("Unkown exception class: hsr: %#08x\n",
+                        (unsigned int)kvm_vcpu_get_hsr(vcpu));
+                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;
+        }
+}