[Xen-devel] slow pciback

[Claes Lindblom <claes.lindblom@xxxxxx>]

I'm using Xen 3.0.3 on Slamd64 11.0 and when I pass the PCI-devices 
bellow to guest domain it's really slow
access to the device nut drivers loads properly. Is there a bug that 
causes this or how can I solve this?
My menu.lst for grub looks like this:
# Linux bootable partition config begins
 title Xen-2.6.16.29 (hda1)
 root (hd0,0)
 kernel /boot/xen-3.gz dom0_mem=262144
 module /boot/vmlinuz-2.6.16.29-xen root=/dev/hda1 ro vga=791 
max_loop=64 pciback.hide=(00:10.0)(00:10.1)(00:10.2)(00:10.3)(00:10.4)
# Linux bootable partition config ends

The config file for xen guest domain looks like:
pci = [ '00:10.0', '00:10.1', '00:10.2', '00:10.3', '00:10.4' ]

00:10.0 USB Controller: VIA Technologies, Inc. VT82xxxxx UHCI USB 1.1 
Controller (rev 90)
00:10.1 USB Controller: VIA Technologies, Inc. VT82xxxxx UHCI USB 1.1 
Controller (rev 90)
00:10.2 USB Controller: VIA Technologies, Inc. VT82xxxxx UHCI USB 1.1 
Controller (rev 90)
00:10.3 USB Controller: VIA Technologies, Inc. VT82xxxxx UHCI USB 1.1 
Controller (rev 90)
00:10.4 USB Controller: VIA Technologies, Inc. USB 2.0 (rev 90)

When I do a dmesg I get this messages about my devices:
pciback 0000:00:10.4: Driver tried to write to a read-only configuration 
space field at offset 0x84, size 2. This may be harmless, but if you 
have problems with your device:
1) see permissive attribute in sysfs
2) report problems to the xen-devel mailing list along with details of 
your device obtained from lspci.
PCI: Enabling device 0000:00:10.4 (0000 -> 0002)
ACPI: PCI Interrupt 0000:00:10.4[C] -> GSI 22 (level, low) -> IRQ 18
pciback 0000:00:10.0: Driver tried to write to a read-only configuration 
space field at offset 0x84, size 2. This may be harmless, but if you 
have problems with your device:
1) see permissive attribute in sysfs
2) report problems to the xen-devel mailing list along with details of 
your device obtained from lspci.
PCI: Enabling device 0000:00:10.0 (0000 -> 0001)
ACPI: PCI Interrupt 0000:00:10.0[A] -> GSI 20 (level, low) -> IRQ 21
pciback 0000:00:10.1: Driver tried to write to a read-only configuration 
space field at offset 0x84, size 2. This may be harmless, but if you 
have problems with your device:
1) see permissive attribute in sysfs
2) report problems to the xen-devel mailing list along with details of 
your device obtained from lspci.
PCI: Enabling device 0000:00:10.1 (0000 -> 0001)
ACPI: PCI Interrupt 0000:00:10.1[C] -> GSI 22 (level, low) -> IRQ 18
pciback 0000:00:10.2: Driver tried to write to a read-only configuration 
space field at offset 0x84, size 2. This may be harmless, but if you 
have problems with your device:
1) see permissive attribute in sysfs
2) report problems to the xen-devel mailing list along with details of 
your device obtained from lspci.
PCI: Enabling device 0000:00:10.2 (0000 -> 0001)
ACPI: PCI Interrupt 0000:00:10.2[B] -> GSI 21 (level, low) -> IRQ 20
pciback 0000:00:10.3: Driver tried to write to a read-only configuration 
space field at offset 0x84, size 2. This may be harmless, but if you 
have problems with your device:
1) see permissive attribute in sysfs
2) report problems to the xen-devel mailing list along with details of 
your device obtained from lspci.
PCI: Enabling device 0000:00:10.3 (0000 -> 0001)

My device on the guest domain is a usb serial port and I get the 
following from dmesg:
ftdi_sio 3-1:1.0: FTDI USB Serial Device converter detected
drivers/usb/serial/ftdi_sio.c: Detected FT232BM
usb 3-1: FTDI USB Serial Device converter now attached to ttyUSB0
ftdi_sio 3-2:1.0: FTDI USB Serial Device converter detected
drivers/usb/serial/ftdi_sio.c: Detected FT232BM
usb 3-2: FTDI USB Serial Device converter now attached to ttyUSB1
usbcore: registered new driver ftdi_sio
drivers/usb/serial/ftdi_sio.c: v1.4.3:USB FTDI Serial Converters Driver

I really need help with this...

Regards
Claes Lindblom

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