split script in multiple files, reassembled through build.sh

src/libs/370_hw_vmm.sh

@@ -0,0 +1,57 @@
+# vim: set ts=4 sw=4 sts=4 et:
+# Check whether the system is running as a Xen paravirtualized guest
+# Returns: 0 if Xen PV, 1 otherwise
+is_xen() {
+    local ret
+    if [ ! -d "$g_procfs/xen" ]; then
+        return 1
+    fi
+
+    # XXX do we have a better way that relying on dmesg?
+    dmesg_grep 'Booting paravirtualized kernel on Xen$'
+    ret=$?
+    if [ "$ret" -eq 2 ]; then
+        pr_warn "dmesg truncated, Xen detection will be unreliable. Please reboot and relaunch this script"
+        return 1
+    elif [ "$ret" -eq 0 ]; then
+        return 0
+    else
+        return 1
+    fi
+}
+
+# Check whether the system is a Xen Dom0 (privileged domain)
+# Returns: 0 if Dom0, 1 otherwise
+is_xen_dom0() {
+    if ! is_xen; then
+        return 1
+    fi
+
+    if [ -e "$g_procfs/xen/capabilities" ] && grep -q "control_d" "$g_procfs/xen/capabilities"; then
+        return 0
+    else
+        return 1
+    fi
+}
+
+# Check whether the system is a Xen DomU (unprivileged PV guest)
+# Returns: 0 if DomU, 1 otherwise
+is_xen_domU() {
+    local ret
+    if ! is_xen; then
+        return 1
+    fi
+
+    # PVHVM guests also print 'Booting paravirtualized kernel', so we need this check.
+    dmesg_grep 'Xen HVM callback vector for event delivery is enabled$'
+    ret=$?
+    if [ "$ret" -eq 0 ]; then
+        return 1
+    fi
+
+    if ! is_xen_dom0; then
+        return 0
+    else
+        return 1
+    fi
+}