mmap error on pci passthrough

mmap error on pci passthrough

[Oliver Schrempf]

Hi

I've tried to use PCI passthrough with a DVB card which fails with an 
mmap error.

 > kvm -name test-system -boot c -m 512  -hda /dev/srv/kvmtest -k de 
-usb  -pcidevice host=03:00.0
assigned_dev_register_regions: Error: Couldn't mmap 0xe1200000!
Failed to initialize assigned device host=03:00.0

I'm using the KVM-83 backport on Ubuntu 8.10
There is no module loaded for the device on the host and no shared IRQs.
Am I doing something wrong?

Thanks
OS

dmesg ouput:
[ 2193.607975] ------------[ cut here ]------------
[ 2193.607980] WARNING: at 
/build/buildd/linux-2.6.27/drivers/pci/pci-sysfs.c:499 
pci_mmap_resource+0x15b/0x170()
[ 2193.607982] process "kvm" tried to map 0x00000000-0x00000001 on 
0000:03:00.0 BAR 0 (size 0x00000000)
[ 2193.607984] Modules linked in: i915 drm ipt_MASQUERADE iptable_nat 
nf_nat nf_conntrack_ipv4 xt_state nf_conntrack ipt_REJECT xt_tcpudp 
bridge stp kvm_intel kvm ipv6 af_packet iptable_filter ip_tables 
x_tables ac parport_pc lp parport loop usblp evdev psmouse intel_agp 
serio_raw agpgart dm_multipath shpchp button pcspkr pci_hotplug scsi_dh 
iTCO_wdt iTCO_vendor_support ext3 jbd mbcache sr_mod sd_mod cdrom 
crc_t10dif sg pata_acpi ata_piix r8169 mii ata_generic libata scsi_mod 
uhci_hcd dock ehci_hcd usbcore raid10 raid456 async_xor async_memcpy 
async_tx xor raid1 raid0 multipath linear md_mod dm_mirror dm_log 
dm_snapshot dm_mod thermal processor fan fbcon tileblit font bitblit 
softcursor fuse
[ 2193.608032] Pid: 5195, comm: kvm Not tainted 2.6.27-11-server #1
[ 2193.608035]  [<c0139465>] warn_slowpath+0x65/0x90
[ 2193.608039]  [<c01c46b6>] ? real_lookup+0x86/0x110
[ 2193.608043]  [<c01c38bb>] ? __follow_mount+0xb/0x90
[ 2193.608045]  [<c01cdbda>] ? dput+0x8a/0x130
[ 2193.608048]  [<c01b88c1>] ? __mem_cgroup_uncharge_common+0x111/0x170
[ 2193.608052]  [<c0199006>] ? __dec_zone_state+0x16/0x90
[ 2193.608055]  [<c019909d>] ? __dec_zone_page_state+0x1d/0x20
[ 2193.608058]  [<c01a5809>] ? page_remove_rmap+0x49/0x110
[ 2193.608061]  [<c0127345>] ? kunmap_atomic+0x35/0x80
[ 2193.608064]  [<c019bd98>] ? zap_pte_range+0x138/0x3a0
[ 2193.608067]  [<c0190b1e>] ? get_pageblock_flags_group+0xe/0x90
[ 2193.608070]  [<c026dd1b>] pci_mmap_resource+0x15b/0x170
[ 2193.608072]  [<c026dd30>] ? pci_mmap_resource_uc+0x0/0x20
[ 2193.608075]  [<c026dd47>] pci_mmap_resource_uc+0x17/0x20
[ 2193.608077]  [<c020a21a>] mmap+0x5a/0xa0
[ 2193.608079]  [<c01a2eb8>] mmap_region+0x1d8/0x4d0
[ 2193.608081]  [<c01a0e2a>] ? find_vma+0xa/0x90
[ 2193.608083]  [<c01a112d>] ? arch_get_unmapped_area_topdown+0x10d/0x170
[ 2193.608086]  [<c021c52c>] ? security_file_mmap+0x2c/0x40
[ 2193.608089]  [<c01a3419>] do_mmap_pgoff+0x269/0x370
[ 2193.608091]  [<c010d93d>] sys_mmap2+0xad/0xc0
[ 2193.608094]  [<c0109f03>] sysenter_do_call+0x12/0x2f
[ 2193.608098]  =======================
[ 2193.608099] ---[ end trace a770bf575e130268 ]---