diff --git a/0001-Differentiate-between-vserver-host-and-guest.patch b/0001-Differentiate-between-vserver-host-and-guest.patch
new file mode 100644
index 0000000..38c34ef
--- /dev/null
+++ b/0001-Differentiate-between-vserver-host-and-guest.patch
@@ -0,0 +1,72 @@
+From d409914d13b88541402fe871d70e3dff9d738455 Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?Elan=20Ruusam=C3=A4e?= <glen@pld-linux.org>
+Date: Mon, 2 Sep 2013 15:24:11 +0100
+Subject: [PATCH 1/2] Differentiate between vserver host and guest.
+
+RWMJ: Update documentation and tests.
+---
+ tests/test-linux-vserver.sh |  3 ++-
+ virt-what.in                |  5 +++++
+ virt-what.pod               | 12 ++++++++++++
+ 3 files changed, 19 insertions(+), 1 deletion(-)
+
+diff --git a/tests/test-linux-vserver.sh b/tests/test-linux-vserver.sh
+index 40d75a5..7988f81 100755
+--- a/tests/test-linux-vserver.sh
++++ b/tests/test-linux-vserver.sh
+@@ -19,7 +19,8 @@
+ root=tests/linux-vserver
+ 
+ output="$(./virt-what --test-root=$root 2>&1)"
+-expected="linux_vserver"
++expected="linux_vserver
++linux_vserver-guest"
+ 
+ if [ "$output" != "$expected" ]; then
+     echo "$0: test failed because output did not match expected"
+diff --git a/virt-what.in b/virt-what.in
+index f12c95b..422f6d0 100644
+--- a/virt-what.in
++++ b/virt-what.in
+@@ -147,6 +147,11 @@ fi
+ # Check for Linux-VServer
+ if cat "${root}/proc/self/status" | grep -q "VxID: [0-9]*"; then
+     echo linux_vserver
++    if grep -q "VxID: 0$" "${root}/proc/self/status"; then
++        echo linux_vserver-host
++    else
++        echo linux_vserver-guest
++    fi
+ fi
+ 
+ # Check for UML.
+diff --git a/virt-what.pod b/virt-what.pod
+index 98cd4af..bff2998 100644
+--- a/virt-what.pod
++++ b/virt-what.pod
+@@ -62,10 +62,22 @@ Status: confirmed by RWMJ using a Fedora guest running in z/VM
+ 
+ =item B<linux_vserver>
+ 
++This is printed for backwards compatibility with older virt-what which
++could not distinguish between a Linux VServer container guest and
++host.
++
++=item B<linux_vserver-guest>
++
+ This process is running in a Linux VServer container.
+ 
+ Status: contributed by Barış Metin
+ 
++=item B<linux_vserver-host>
++
++This process is running as the Linux VServer host (VxID 0).
++
++Status: contributed by Barış Metin and Elan Ruusamäe
++
+ =item B<lxc>
+ 
+ This process is running in a Linux LXC container.
+-- 
+1.8.3.1
+
diff --git a/0002-Detect-new-Xen-VMs-RHBZ-973663.patch b/0002-Detect-new-Xen-VMs-RHBZ-973663.patch
new file mode 100644
index 0000000..a161b63
--- /dev/null
+++ b/0002-Detect-new-Xen-VMs-RHBZ-973663.patch
@@ -0,0 +1,25 @@
+From acd6bec92a99550ad98011d44f6381fdf7fa5992 Mon Sep 17 00:00:00 2001
+From: nodata <lsof@nodata.co.uk>
+Date: Mon, 2 Sep 2013 16:59:32 +0100
+Subject: [PATCH 2/2] Detect new Xen VMs (RHBZ#973663).
+
+---
+ virt-what.in | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/virt-what.in b/virt-what.in
+index 422f6d0..bf663aa 100644
+--- a/virt-what.in
++++ b/virt-what.in
+@@ -197,7 +197,7 @@ fi
+ if [ "$cpuid" = "XenVMMXenVMM" ]; then
+     echo xen; echo xen-hvm
+     skip_qemu_kvm=true
+-elif [ -f "${root}/proc/xen/capabilities" ]; then
++elif [ -d "${root}/proc/xen" ]; then
+     echo xen
+     if grep -q "control_d" "${root}/proc/xen/capabilities"; then
+         echo xen-dom0
+-- 
+1.8.3.1
+
diff --git a/virt-what.spec b/virt-what.spec
index f2b5290..501103b 100644
--- a/virt-what.spec
+++ b/virt-what.spec
@@ -2,12 +2,13 @@ Name:           virt-what
 Version:        1.13
 Release:        1%{?dist}
 Summary:        Detect if we are running in a virtual machine
-
-Group:          Applications/Emulators
 License:        GPLv2+
+
 URL:            http://people.redhat.com/~rjones/virt-what/
 Source0:        http://people.redhat.com/~rjones/virt-what/files/%{name}-%{version}.tar.gz
-BuildRoot:      %{_tmppath}/%{name}-%{version}-%{release}-root-%(%{__id_u} -n)
+
+Patch1:         0001-Differentiate-between-vserver-host-and-guest.patch
+Patch2:         0002-Detect-new-Xen-VMs-RHBZ-973663.patch
 
 # This is provided by the build root, but we make it explicit
 # anyway in case this was dropped from the build root in future.
@@ -57,6 +58,9 @@ Current types of virtualization detected:
 %prep
 %setup -q
 
+%patch1 -p1
+%patch2 -p1
+
 
 %build
 %configure
@@ -64,7 +68,6 @@ make
 
 
 %install
-rm -rf $RPM_BUILD_ROOT
 make install DESTDIR=$RPM_BUILD_ROOT
 
 
@@ -72,12 +75,7 @@ make install DESTDIR=$RPM_BUILD_ROOT
 make check
 
 
-%clean
-rm -rf $RPM_BUILD_ROOT
-
-
 %files
-%defattr(-,root,root,-)
 %doc README COPYING
 %{_sbindir}/virt-what
 %{_libexecdir}/virt-what-cpuid-helper
@@ -85,6 +83,11 @@ rm -rf $RPM_BUILD_ROOT
 
 
 %changelog
+* Wed Sep 11 2013 Richard W.M. Jones <rjones@redhat.com> - 1.13-2
+- Include two upstream patches for detecting Xen and Linux VServer better
+  (RHBZ#973663).
+- Modernize the spec file.
+
 * Mon Jul 29 2013 Richard W.M. Jones <rjones@redhat.com> - 1.13-1
 - New upstream version 1.13.