detect-virt: bare-metal GCE only for x86 and i386

From the previous changes, bare-metal support has been added by using
the `detect_vm_cpuid()` which works only for x86_64 and i386 architecture.
Do not use this change for other architectures to avoid wrong result of
the detect-virt tool.

Follow-up for fb71571d3a4efddeb44f02939304be9007301974.
Fixes #38125.

man/bootctl.xml

@@ -269,7 +269,7 @@
 
     <variablelist>
       <varlistentry>
-        <term><option>kernel-identify</option> <replaceable>kernel</replaceable></term>
+        <term><option>kernel-identify</option> <replaceable>KERNEL-IMAGE</replaceable></term>
 
         <listitem><para>Takes a kernel image as argument. Checks what kind of kernel the image is. Returns
         one of <literal>uki</literal>, <literal>addon</literal>, <literal>pe</literal>, and
@@ -280,7 +280,7 @@
       </varlistentry>
 
       <varlistentry>
-        <term><option>kernel-inspect</option> <replaceable>kernel</replaceable></term>
+        <term><option>kernel-inspect</option> <replaceable>KERNEL-IMAGE</replaceable></term>
 
         <listitem><para>Takes a kernel image as argument. Prints details about the image.</para>
 

src/basic/virt.c

@@ -475,6 +475,13 @@ Virtualization detect_vm(void) {
                    VIRTUALIZATION_ORACLE,
                    VIRTUALIZATION_XEN,
                    VIRTUALIZATION_AMAZON,
+                   /* Unable to distinguish a GCE machine from a VM to bare-metal
+                    * for non-x86 architectures due to its necessity for cpuid
+                    * detection, which functions solely on x86 platforms. Report
+                    * as a VM for other architectures. */
+#if !defined(__i386__) && !defined(__x86_64__)
+                   VIRTUALIZATION_GOOGLE,
+#endif
                    VIRTUALIZATION_PARALLELS)) {
                 v = dmi;
                 goto finish;

src/bootctl/bootctl.c

@@ -280,8 +280,10 @@ static int help(int argc, char *argv[], void *userdata) {
                "  random-seed          Initialize or refresh random seed in ESP and EFI\n"
                "                       variables\n"
                "\n%3$sKernel Image Commands:%4$s\n"
-               "  kernel-identify      Identify kernel image type\n"
-               "  kernel-inspect       Prints details about the kernel image\n"
+               "  kernel-identify KERNEL-IMAGE\n"
+               "                       Identify kernel image type\n"
+               "  kernel-inspect KERNEL-IMAGE\n"
+               "                       Prints details about the kernel image\n"
                "\n%3$sBlock Device Discovery Commands:%4$s\n"
                "  -p --print-esp-path  Print path to the EFI System Partition mount point\n"
                "  -x --print-boot-path Print path to the $BOOT partition mount point\n"

test/units/TEST-17-UDEV.watch.sh

@@ -24,6 +24,9 @@ function check_validity() {
 
 function check() {
     for _ in {1..2}; do
+        # To make journal not rotated during checking journals below.
+        journalctl --rotate
+
         systemctl reset-failed systemd-udevd.service
         systemctl restart systemd-udevd.service
         udevadm settle --timeout=30