[Xen-users] pci devices disappear in Xen pv domU on reboot

[tseegerkrb <tseegerkrb@xxxxxxxxx>]

Hello,

I have a problem with passed pci devices in pv domUs. When I restart the
vm, the pci devices disappear.
After a complete shutdown and start of the domU the pci devices are
functional again.
I found a very old redhat thread about a similar problem.
(PCI devices disappear in Xen Paravirtual DomU on reboot/reset
https://bugzilla.redhat.com/show_bug.cgi?id=233801)
My Xen version is 4.10.0 with a 4.16.8 dom0 kernel. The restart problem
is new, but I don't know how long. Maybe since the upgrade to 4.10, but
I'm not sure.
Does anyone have an idea or a hint where I could look for a solution.
Could it be a communication problem with the xenstored?


host                   : stargate
release                : 4.16.8-gentoo
version                : #1 SMP Wed May 9 15:43:54 CEST 2018
machine                : x86_64
nr_cpus                : 12
max_cpu_id             : 11
nr_nodes               : 1
cores_per_socket       : 6
threads_per_core       : 2
cpu_mhz                : 2593
hw_caps                :
bfebfbff:77bee3ff:2c100800:00000001:00000001:00000281:00000000:00000100
virt_caps              : hvm hvm_directio
total_memory           : 65471
free_memory            : 51818
sharing_freed_memory   : 0
sharing_used_memory    : 0
outstanding_claims     : 0
free_cpus              : 0
xen_major              : 4
xen_minor              : 10
xen_extra              : .0
xen_version            : 4.10.0
xen_caps               : xen-3.0-x86_64 xen-3.0-x86_32p hvm-3.0-x86_32
hvm-3.0-x86_32p hvm-3.0-x86_64
xen_scheduler          : credit
xen_pagesize           : 4096
platform_params        : virt_start=0xffff800000000000
xen_changeset          :
xen_commandline        : placeholder cpuidle dom0_mem=8G,max:8G
dom0_max_vcpus=2 dom0_vcpus_pin cpufreq=xen:ondemand loglvl=warning
guest_loglvl=warning tmem=1 tmem_compress=1 com1=115200,8n1,pci
console=com1,vga
cc_compiler            : x86_64-pc-linux-gnu-gcc (Gentoo 7.3.0-r1 p1.1)
7.3.0
cc_compile_by          :
cc_compile_domain      : mydom.local
cc_compile_date        : Sat Mar 24 12:38:39 CET 2018
build_id               : a9306119e80e90fe902e182e8b5590a61ed0119b
xend_config_format     : 4



Thanks for the help and all the best
Thorsten


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