1 files changed, 221 insertions, 0 deletions

diff --git a/arch/arm/kvm/guest.c b/arch/arm/kvm/guest.c
new file mode 100644
index 000000000000..a12eb229021d
--- /dev/null
+++ b/arch/arm/kvm/guest.c
@@ -0,0 +1,221 @@
+/*
+ * 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, write to the Free Software
+ * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+ */
+
+#include <linux/errno.h>
+#include <linux/err.h>
+#include <linux/kvm_host.h>
+#include <linux/module.h>
+#include <linux/vmalloc.h>
+#include <linux/fs.h>
+#include <asm/uaccess.h>
+#include <asm/kvm.h>
+#include <asm/kvm_asm.h>
+#include <asm/kvm_emulate.h>
+
+#define VM_STAT(x) { #x, offsetof(struct kvm, stat.x), KVM_STAT_VM }
+#define VCPU_STAT(x) { #x, offsetof(struct kvm_vcpu, stat.x), KVM_STAT_VCPU }
+
+struct kvm_stats_debugfs_item debugfs_entries[] = {
+        { NULL }
+};
+
+int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu)
+{
+        return 0;
+}
+
+static u64 core_reg_offset_from_id(u64 id)
+{
+        return id & ~(KVM_REG_ARCH_MASK | KVM_REG_SIZE_MASK | KVM_REG_ARM_CORE);
+}
+
+static int get_core_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
+{
+        u32 __user *uaddr = (u32 __user *)(long)reg->addr;
+        struct kvm_regs *regs = &vcpu->arch.regs;
+        u64 off;
+
+        if (KVM_REG_SIZE(reg->id) != 4)
+                return -ENOENT;
+
+        /* Our ID is an index into the kvm_regs struct. */
+        off = core_reg_offset_from_id(reg->id);
+        if (off >= sizeof(*regs) / KVM_REG_SIZE(reg->id))
+                return -ENOENT;
+
+        return put_user(((u32 *)regs)[off], uaddr);
+}
+
+static int set_core_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
+{
+        u32 __user *uaddr = (u32 __user *)(long)reg->addr;
+        struct kvm_regs *regs = &vcpu->arch.regs;
+        u64 off, val;
+
+        if (KVM_REG_SIZE(reg->id) != 4)
+                return -ENOENT;
+
+        /* Our ID is an index into the kvm_regs struct. */
+        off = core_reg_offset_from_id(reg->id);
+        if (off >= sizeof(*regs) / KVM_REG_SIZE(reg->id))
+                return -ENOENT;
+
+        if (get_user(val, uaddr) != 0)
+                return -EFAULT;
+
+        if (off == KVM_REG_ARM_CORE_REG(usr_regs.ARM_cpsr)) {
+                unsigned long mode = val & MODE_MASK;
+                switch (mode) {
+                case USR_MODE:
+                case FIQ_MODE:
+                case IRQ_MODE:
+                case SVC_MODE:
+                case ABT_MODE:
+                case UND_MODE:
+                        break;
+                default:
+                        return -EINVAL;
+                }
+        }
+
+        ((u32 *)regs)[off] = val;
+        return 0;
+}
+
+int kvm_arch_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
+{
+        return -EINVAL;
+}
+
+int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
+{
+        return -EINVAL;
+}
+
+static unsigned long num_core_regs(void)
+{
+        return sizeof(struct kvm_regs) / sizeof(u32);
+}
+
+/**
+ * kvm_arm_num_regs - how many registers do we present via KVM_GET_ONE_REG
+ *
+ * This is for all registers.
+ */
+unsigned long kvm_arm_num_regs(struct kvm_vcpu *vcpu)
+{
+        return num_core_regs();
+}
+
+/**
+ * kvm_arm_copy_reg_indices - get indices of all registers.
+ *
+ * We do core registers right here, then we apppend coproc regs.
+ */
+int kvm_arm_copy_reg_indices(struct kvm_vcpu *vcpu, u64 __user *uindices)
+{
+        unsigned int i;
+        const u64 core_reg = KVM_REG_ARM | KVM_REG_SIZE_U32 | KVM_REG_ARM_CORE;
+
+        for (i = 0; i < sizeof(struct kvm_regs)/sizeof(u32); i++) {
+                if (put_user(core_reg | i, uindices))
+                        return -EFAULT;
+                uindices++;
+        }
+
+        return 0;
+}
+
+int kvm_arm_get_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
+{
+        /* We currently use nothing arch-specific in upper 32 bits */
+        if ((reg->id & ~KVM_REG_SIZE_MASK) >> 32 != KVM_REG_ARM >> 32)
+                return -EINVAL;
+
+        /* Register group 16 means we want a core register. */
+        if ((reg->id & KVM_REG_ARM_COPROC_MASK) == KVM_REG_ARM_CORE)
+                return get_core_reg(vcpu, reg);
+
+        return -EINVAL;
+}
+
+int kvm_arm_set_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
+{
+        /* We currently use nothing arch-specific in upper 32 bits */
+        if ((reg->id & ~KVM_REG_SIZE_MASK) >> 32 != KVM_REG_ARM >> 32)
+                return -EINVAL;
+
+        /* Register group 16 means we set a core register. */
+        if ((reg->id & KVM_REG_ARM_COPROC_MASK) == KVM_REG_ARM_CORE)
+                return set_core_reg(vcpu, reg);
+
+        return -EINVAL;
+}
+
+int kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu,
+                                  struct kvm_sregs *sregs)
+{
+        return -EINVAL;
+}
+
+int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,
+                                  struct kvm_sregs *sregs)
+{
+        return -EINVAL;
+}
+
+int kvm_vcpu_set_target(struct kvm_vcpu *vcpu,
+                        const struct kvm_vcpu_init *init)
+{
+        unsigned int i;
+
+        /* We can only do a cortex A15 for now. */
+        if (init->target != kvm_target_cpu())
+                return -EINVAL;
+
+        vcpu->arch.target = init->target;
+        bitmap_zero(vcpu->arch.features, KVM_VCPU_MAX_FEATURES);
+
+        /* -ENOENT for unknown features, -EINVAL for invalid combinations. */
+        for (i = 0; i < sizeof(init->features) * 8; i++) {
+                if (test_bit(i, (void *)init->features)) {
+                        if (i >= KVM_VCPU_MAX_FEATURES)
+                                return -ENOENT;
+                        set_bit(i, vcpu->arch.features);
+                }
+        }
+
+        /* Now we know what it is, we can reset it. */
+        return kvm_reset_vcpu(vcpu);
+}
+
+int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
+{
+        return -EINVAL;
+}
+
+int kvm_arch_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
+{
+        return -EINVAL;
+}
+
+int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu,
+                                  struct kvm_translation *tr)
+{
+        return -EINVAL;
+}