[Xen-users] DomU sees only 512MB RAM with PCI-passthrough

[Christian Holpert <christian@xxxxxxxxxx>]

Hello,

I'm using Xen 4.2.0 on a gentoo 3.4.11-System, all 32bit PAE.

I can assign as much memory as needed to my domU with one exception. 
This domU is the only one that has a PCI device passed through via config file:
kernel      = "/boot/kernel-3.4.11-xenU"
vcpus       = 3
vcpu_avail  = 3
memory      = 2048
name        = "nodi"
on_reboot   = "restart"
vif         = [ 'mac=aa:00:00:48:44:af' ]
disk        = [ '/opt/xen/nodi.img,raw,xvda1,w', 
'/opt/xen/swap.nodi,raw,xvda2,w', 'phy:/dev/sdb5,xvda3,w', 
'/opt/xen/GBSpace.img,raw,xvda4,w' ]
root        = "/dev/xvda1 rootfstype=ext4 rootfsflags=barrier=0"
extra       = "console=hvc0 xencons=hvc xen-fbfront.video=6,1024,768 
xenfb.video=6,1024,768 noirqdebug elevator=noop"
vfb         = [ 'vnc=1,vncdisplay=10,vnclisten=0.0.0.0,keymap=de' ]
pci         = [ '01:02.0' ]
pci_msitranslate = 1

When I start up this domU (xl start nodi.cfg) it will get 512MB only. 
When I comment out the pci-line, then memory ist correct with 2048MB.
The cheat-mode works, though. I can start the domain with pci commented out and
xen # xl pci-attach nodi 01:02.0
assign the device immediately after startup. PCI works and memory is 2048MB.
nodi ~ # lspci
00:00.0 Network controller: AVM GmbH A1 ISDN [Fritz] (rev 02)
nodi ~ # cat /proc/meminfo
MemTotal:        2069168 kB
MemFree:         1814776 kB
[...]

Can anybody tell me, how to debug this? Or is this a feature?

xen ~ # xl info nodi
host                   : xen
release                : 3.4.11-gentoo
version                : #7 SMP Mon Dec 3 20:37:13 CET 2012
machine                : i686
nr_cpus                : 4
max_cpu_id             : 3
nr_nodes               : 1
cores_per_socket       : 4
threads_per_core       : 1
cpu_mhz                : 3392
hw_caps                : 
bfebfbff:28100000:00000000:00007f40:77bae3ff:00000000:00000001:00000281
virt_caps              : hvm hvm_directio
total_memory           : 15778
free_memory            : 5893
sharing_freed_memory   : 72057594037927935
sharing_used_memory    : 72057594037927935
free_cpus              : 0
xen_major              : 4
xen_minor              : 2
xen_extra              : .0
xen_caps               : xen-3.0-x86_32p hvm-3.0-x86_32 hvm-3.0-x86_32p
xen_scheduler          : credit
xen_pagesize           : 4096
platform_params        : virt_start=0xf5800000
xen_changeset          : unavailable
xen_commandline        : vtd=1 iommu=1 vga=gfx-1024x768x16 msi=1 dom0_mem=2560M
cc_compiler            : gcc (Gentoo 4.6.3 p1.8, pie-0.5.2) 4.6.3
cc_compile_by          :
cc_compile_domain      : APO43287A.LOCAL
cc_compile_date        : Tue Dec 11 15:58:25 CET 2012
xend_config_format     : 4

Please tell me, if you need more logs.

Thanks,
Christian


--
Markt-Apotheke Christian Holpert e.K., Mömbris
  http://www.marktapotheke.org - info@xxxxxxxxxxxxxxxxx
  http://www.blue-essentials-shop.de - info@xxxxxxxxxxxxxxxxxxxxxxx
  Apotheker Christian Holpert
Im Markthof 5
63776 Mömbris
  Tel.: 06029-1379 Fax: 9986589

Amtsgericht Aschaffenburg, HR.A, Registernummer 2165


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