+=item windows=(yes|no)
+
+Answer C<yes> if Microsoft Windows is installed in the guest.
+
+=cut
+
+sub output_query_windows
+{
+ my $windows = "no";
+ foreach my $os (keys %$oses) {
+ $windows="yes" if $oses->{$os}->{os} eq "windows";
+ }
+ print "windows=$windows\n";
+}
+
+=item linux=(yes|no)
+
+Answer C<yes> if a Linux kernel is installed in the guest.
+
+=cut
+
+sub output_query_linux
+{
+ my $linux = "no";
+ foreach my $os (keys %$oses) {
+ $linux="yes" if $oses->{$os}->{os} eq "linux";
+ }
+ print "linux=$linux\n";
+}
+
+=item rhel=(yes|no)
+
+Answer C<yes> if the guest contains Red Hat Enterprise Linux.
+
+=cut
+
+sub output_query_rhel
+{
+ my $rhel = "no";
+ foreach my $os (keys %$oses) {
+ $rhel="yes" if ($oses->{$os}->{os} eq "linux" &&
+ $oses->{$os}->{distro} eq "rhel");
+ }
+ print "rhel=$rhel\n";
+}
+
+=item fedora=(yes|no)
+
+Answer C<yes> if the guest contains the Fedora Linux distribution.
+
+=cut
+
+sub output_query_fedora
+{
+ my $fedora = "no";
+ foreach my $os (keys %$oses) {
+ $fedora="yes" if $oses->{$os}->{os} eq "linux" && $oses->{$os}->{distro} eq "fedora";
+ }
+ print "fedora=$fedora\n";
+}
+
+=item debian=(yes|no)
+
+Answer C<yes> if the guest contains the Debian Linux distribution.
+
+=cut
+
+sub output_query_debian
+{
+ my $debian = "no";
+ foreach my $os (keys %$oses) {
+ $debian="yes" if $oses->{$os}->{os} eq "linux" && $oses->{$os}->{distro} eq "debian";
+ }
+ print "debian=$debian\n";
+}
+
+=item fullvirt=(yes|no)
+
+Answer C<yes> if there is at least one operating system kernel
+installed in the guest which runs fully virtualized. Such a guest
+would require a hypervisor which supports full system virtualization.
+
+=cut
+
+sub output_query_fullvirt
+{
+ # The assumption is full-virt, unless all installed kernels
+ # are identified as paravirt.
+ # XXX Fails on Windows guests.
+ foreach my $os (keys %$oses) {
+ foreach my $kernel (@{$oses->{$os}->{kernels}}) {
+ my $is_pv = $kernel->{version} =~ m/xen/;
+ unless ($is_pv) {
+ print "fullvirt=yes\n";
+ return;
+ }
+ }
+ }
+ print "fullvirt=no\n";
+}
+
+=item xen_domU_kernel=(yes|no)
+
+Answer C<yes> if there is at least one Linux kernel installed in
+the guest which is compiled as a Xen DomU (a Xen paravirtualized
+guest).
+
+=cut
+
+sub output_query_xen_domU_kernel
+{
+ foreach my $os (keys %$oses) {
+ foreach my $kernel (@{$oses->{$os}->{kernels}}) {
+ my $is_xen = $kernel->{version} =~ m/xen/;
+ if ($is_xen) {
+ print "xen_domU_kernel=yes\n";
+ return;
+ }
+ }
+ }
+ print "xen_domU_kernel=no\n";
+}
+
+=item xen_pv_drivers=(yes|no)
+
+Answer C<yes> if the guest has Xen paravirtualized drivers installed
+(usually the kernel itself will be fully virtualized, but the PV
+drivers have been installed by the administrator for performance
+reasons).
+
+=cut
+
+sub output_query_xen_pv_drivers
+{
+ foreach my $os (keys %$oses) {
+ foreach my $kernel (@{$oses->{$os}->{kernels}}) {
+ foreach my $module (@{$kernel->{modules}}) {
+ if ($module =~ m/xen-/) {
+ print "xen_pv_drivers=yes\n";
+ return;
+ }
+ }
+ }
+ }
+ print "xen_pv_drivers=no\n";
+}
+
+=item virtio_drivers=(yes|no)
+
+Answer C<yes> if the guest has virtio paravirtualized drivers
+installed. Virtio drivers are commonly used to improve the
+performance of KVM.
+
+=cut
+
+sub output_query_virtio_drivers
+{
+ foreach my $os (keys %$oses) {
+ foreach my $kernel (@{$oses->{$os}->{kernels}}) {
+ foreach my $module (@{$kernel->{modules}}) {
+ if ($module =~ m/virtio_/) {
+ print "virtio_drivers=yes\n";
+ return;
+ }
+ }
+ }
+ }
+ print "virtio_drivers=no\n";
+}
+
+=item userspace_arch=(x86_64|...)
+
+Print the architecture of userspace.
+
+NB. For multi-boot VMs this can print several lines.
+
+=cut
+
+sub output_query_userspace_arch
+{
+ my %arches;
+
+ foreach my $os (keys %$oses) {
+ $arches{$oses->{$os}->{arch}} = 1 if exists $oses->{$os}->{arch};
+ }
+
+ foreach (sort keys %arches) {
+ print "userspace_arch=$_\n";
+ }
+}
+
+=item kernel_arch=(x86_64|...)
+
+Print the architecture of the kernel.
+
+NB. For multi-boot VMs this can print several lines.
+
+=cut
+
+sub output_query_kernel_arch
+{
+ my %arches;
+
+ foreach my $os (keys %$oses) {
+ foreach my $kernel (@{$oses->{$os}->{kernels}}) {
+ $arches{$kernel->{arch}} = 1 if exists $kernel->{arch};
+ }
+ }
+
+ foreach (sort keys %arches) {
+ print "kernel_arch=$_\n";
+ }
+}
+
+=back
+