wip: vcpu structure and initialization

proto/vcpu/vcpu.c

+#include "vcpu.h"
+#include "../debug/debug.h"
+#include "../region/vxmon.h"
+#include <linux/errno.h>
+
+int init_vcpu(struct vcpu_t *vcpu, struct vmxon_t *vmxon) {
+    if (!vcpu) {
+        DEBUG_FMT("vcpu isn't allocated\n");
+        return -EFAULT;
+    }
+
+    if (!vmxon) {
+        DEBUG_FMT("vmxon region isn't allocated\n");
+        return -EFAULT;
+    }
+
+    vcpu->vmxon = vmxon;
+
+    return 0;
+}

proto/vcpu/vcpu.h

+#pragma once
+
+#include "../region/vxmon.h"
+
+struct vcpu_t {
+    struct vmxon_t *vmxon;
+    /*NOTE: prolly should store the PAs of pointers to avoid unnecessary
+     * address translations, although they should reside in the TLB by that
+     * point*/
+};
+
+int init_vcpu(struct vcpu_t *vcpu);