$ cat ../README.hold
xenuser@z68xen:~$ sudo xl list
Name                                        ID   Mem VCPUs	State	Time(s)
Domain-0                                     0  1536     4     r-----      21.6
jam22                                        1  3024     4     -b----       6.7
bookyz                                       2  4096     4     -b----      10.3
al9pv                                        3  4096     4     -b----       8.3
al8pv                                        4  4096     4     -b----       8.5
fc37cnv                                      5  3072     4     -b----       9.2
pvbully                                      6  2684     4     -b----       7.1
ub2204z                                      7  5120     4     -b----       9.3

xenuser@z68xen:~$ sudo xl info
host                   : z68xen
release                : 6.1.0-12-amd64
version                : #1 SMP PREEMPT_DYNAMIC Debian 6.1.52-1 (2023-09-07)
machine                : x86_64
nr_cpus                : 4
max_cpu_id             : 7
nr_nodes               : 1
cores_per_socket       : 4
threads_per_core       : 1
cpu_mhz                : 3410.016
hw_caps                : bfebfbff:77bae3ff:28100800:00000001:00000001:00000281:00000000:00000100
virt_caps              : pv hvm hap shadow gnttab-v1 gnttab-v2
total_memory           : 32685
free_memory            : 4619
sharing_freed_memory   : 0
sharing_used_memory    : 0
outstanding_claims     : 0
free_cpus              : 0
xen_major              : 4
xen_minor              : 17
xen_extra              : .2
xen_version            : 4.17.2
xen_caps               : xen-3.0-x86_64 hvm-3.0-x86_32 hvm-3.0-x86_32p hvm-3.0-x86_64 
xen_scheduler          : credit2
xen_pagesize           : 4096
platform_params        : virt_start=0xffff800000000000
xen_changeset          : 0b56bed864ca9b5-x86/pv: Correct the auditing of guest breakpoin
xen_commandline        : placeholder dom0_mem=1536M,max:1584M guest_loglvl=all loglvl=all console=vga vga=gfx-1280x1024x16 conring_size=48k sched=credit2 cpufreq=none com1=115200,8n1 console=com1 ucode=scan xpti=false dom0_max_vcpus=4 dom0_vcpus_pin
cc_compiler            : gcc (Debian 12.2.0-14) 12.2.0
cc_compile_by          : pbuser
cc_compile_domain      : hldns.com
cc_compile_date        : Mon Oct 23 10:03:14 PDT 2023
build_id               : 42b160b95ee4ab8c3231aea66fdc55677d8d9334
xend_config_format     : 4

sudo systemd-analyze time
Startup finished in 9.102s (kernel) + 32.439s (userspace) = 41.541s 
multi-user.target reached after 32.425s in userspace.

xenuser@z68xen:~$ cd xen4h-nmu-q72/
xenuser@z68xen:~/xen4h-nmu-q72$ ls -al
total 28504
drwxr-xr-x  3 xenuser xenuser     4096 Oct 23 10:24 .
drwxr-xr-x 31 xenuser xenuser     4096 Oct 23 10:30 ..
-rw-r--r--  1 xenuser xenuser     1196 Oct 22 16:34 filelist
drwxr-xr-x  2 xenuser xenuser     4096 Oct 23 08:58 last
-rw-r--r--  1 xenuser xenuser   514472 Oct 23 10:13 libxen-4.17_4.17.2-1+deb12u2.5_amd64.deb
-rw-r--r--  1 xenuser xenuser   807400 Oct 23 10:13 libxen-dev_4.17.2-1+deb12u2.5_amd64.deb.not
-rw-r--r--  1 xenuser xenuser    34972 Oct 23 10:13 libxenstore4.0_4.17.2-1+deb12u2.5_amd64.deb
-rw-r--r--  1 xenuser xenuser    25852 Oct 23 10:13 libxentoolcore1_4.17.2-1+deb12u2.5_amd64.deb
-rw-r--r--  1 xenuser xenuser      157 Oct 23 08:51 my-hold
-rw-r--r--  1 xenuser xenuser     2962 Oct 23 08:58 proposed-downgrade.bad
-rw-r--r--  1 xenuser xenuser   876764 Oct 23 10:14 qemut_0.10.2+2-1+deb12u2.5_amd64.deb.not
-rw-r--r--  1 xenuser xenuser 21056360 Oct 23 10:14 qemuu_7.2.4+2-1+deb12u2.5_amd64.deb
-rw-r--r--  1 xenuser xenuser      628 Oct 23 10:25 README.bookworm-nmu.txt
-rw-r--r--  1 xenuser xenuser      109 Oct 23 08:52 README.hold
-rw-r--r--  1 xenuser xenuser  3856972 Oct 23 10:13 xen-hypervisor-4.17-amd64_4.17.2-1+deb12u2.5_amd64.deb
-rw-r--r--  1 xenuser xenuser    32324 Oct 23 10:14 xenstore-utils_4.17.2-1+deb12u2.5_amd64.deb
-rw-r--r--  1 xenuser xenuser    23704 Oct 23 10:13 xen-system-amd64_4.17.2-1+deb12u2.5_amd64.deb
-rw-r--r--  1 xenuser xenuser  1671948 Oct 23 10:13 xen-utils-4.17_4.17.2-1+deb12u2.5_amd64.deb
-rw-r--r--  1 xenuser xenuser   231772 Oct 23 10:12 xen-utils-common_4.17.2-1+deb12u2.5_all.deb

xenuser@z68xen:~/xen4h-nmu-q72$ cat my-hold 
libxen-4.17:amd64
libxenstore4.0:amd64
libxentoolcore1:amd64
qemuu
xen-hypervisor-4.17-amd64
xen-system-amd64
xen-utils-4.17
xen-utils-common
xenstore-utils

xenuser@z68xen:~/xen4h-nmu-q72$ for i in `cat my-hold`;do sudo apt-mark hold $i;done
libxen-4.17 set on hold.
libxenstore4.0 set on hold.
libxentoolcore1 set on hold.
qemuu set on hold.
xen-hypervisor-4.17-amd64 set on hold.
xen-system-amd64 set on hold.
xen-utils-4.17 set on hold.
xen-utils-common set on hold.
xenstore-utils set on hold.

xenuser@z68xen:~/xen4h-nmu-q72$ sudo dpkg --get-selections | grep -P 'xen|qemuu'
libxen-4.17:amd64				hold
libxenstore4.0:amd64				hold
libxentoolcore1:amd64				hold
qemuu						hold
xen-hypervisor-4.17-amd64			hold
xen-system-amd64				hold
xen-utils-4.17					hold
xen-utils-common				hold
xenstore-utils					hold