Ive not had this problem on any other machine I run qubes on, and its a bit 
perplexing

service VMs will not start automatically during the boot process. systemctl 
status returns "libxenlight failed to create new domain"

libxl-driver.log shows "domcreate_attached_devices: unable to add PCI devices" 
and "Backend /local/domain/0/backend/pci/X/0 not ready" as well asl "/dev/loop0 
no such device or address"

I thought maybe some IOMMU issue, but xl dmesg reports that the IOMMU is inited 
correctly. 

I found I could not manually start any qube from the command line. While trying 
to figure it out, i notied xl list showed dom0 had all the avialable RAM 
allocated to it. So I did xl mem-set 0 1536 

at this point, systemctl will happily start all service qubes. no problem 
whatsoever. So its something to do with dom0 and handing out ram.

the boot command line contains dom0_mem=min:1024M and dom0_mem=max:1536M but 
these are seemingly ignored. 

Any suggestions? 

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