[Xen-users] xen_pt_region_update: Error: create new mem mapping failed! (err: 22)

[Håkon Alstadheim <hakon@xxxxxxxxxxxxxxxxxx>]

I'm trying, and failing, to launch a vm with bios = 'ovmf' under xen 4.10.

The domain launches OK as long as I do not pass any pci devices through,
but with pci devices passed through, I get the following in the
device-model.log:
-----
qemu-system-i386: -serial pty: char device redirected to /dev/pts/17
(label serial0)
[00:06.0] xen_pt_region_update: Error: create new mem mapping failed!
(err: 22)
[00:06.0] xen_pt_region_update: Error: remove old mem mapping failed!
(err: 22)
[00:07.0] xen_pt_region_update: Error: create new mem mapping failed!
(err: 22)
[00:07.0] xen_pt_region_update: Error: remove old mem mapping failed!
(err: 22)
[00:08.0] xen_pt_region_update: Error: create new mem mapping failed!
(err: 22)
[00:08.0] xen_pt_region_update: Error: create new mem mapping failed!
(err: 22)
[00:08.0] xen_pt_region_update: Error: remove old mem mapping failed!
(err: 22)
[00:08.0] xen_pt_region_update: Error: remove old mem mapping failed!
(err: 22)
-------

Launch of the domain just hangs before the ovmf setup screen, nothing
else happening in any of the logs as far as I can see.

The domain runs fine without a 'bios=' line, but then it is not much use
to me :-/.

The devices in question are a display-card and a usb-3.0 card. Pasing
either or both of the cards result in the same type of failure.
--------------------------
For completeness, here is output of xl info:
xl info
host                   : gentoo
release                : 4.14.15-gentoo
version                : #1 SMP Wed Jan 24 00:37:30 CET 2018
machine                : x86_64
nr_cpus                : 24
max_cpu_id             : 23
nr_nodes               : 2
cores_per_socket       : 6
threads_per_core       : 2
cpu_mhz                : 2394
hw_caps                :
bfebfbff:77fef3ff:2c100800:00000021:00000001:000037ab:00000000:00000100
virt_caps              : hvm hvm_directio
total_memory           : 65379
free_memory            : 17086
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        : ssd-xen-dbg-noidle-marker-3
console_timestamps=date iommu=1,intpost,verbose,debug
iommu_inclusive_mapping=1 com1=57600,8n1 com2=57600,8n1 console=com2,vga
dom0_max_vcpus=8 dom0_vcpus_pin=1 dom0_mem=7G,max:7G
cpufreq=xen:performance,verbose sched_smt_power_savings=1
core_parking=power nmi=dom0 gnttab_max_frames=256
gnttab_max_maptrack_frames=1024 vcpu_migration_delay=2000
tickle_one_idle_cpu=1 cpuidle=0 loglvl=all guest_loglvl=all sync_console
apic_verbosity=debug e820-verbose=1 tmem=0
cc_compiler            : gcc (Gentoo 6.4.0 p1.1) 6.4.0
cc_compile_by          : hakon
cc_compile_domain      : alstadheim.priv.no
cc_compile_date        : Sat Jan  6 04:00:57 CET 2018
build_id               : bd8a311cf81fe38a08e4f43b476409c2
xend_config_format     : 4



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