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xen-users
[Xen-users] 3.0.3 - possible bug in pciback and irq allocation?
Hi,
Posted to xen-users in case I'm wrong.. but.. it looks like there's a
problem with detection of irq's still around in 3.0.3?
3.0.2 had an irq allocation bug that kept destroying my raid array
courtesy of a domU's pci frontend nic getting the same irq as my sata
controller (the noirqdebug hack wasn't avoiding it - I was getting the
"nobody cared" problem frequently).
I have 2 identical NIC's to pass through, one to each of a pair of
domU's. I've reserved the devices using pciback.
But, whilst one domU correctly takes an unused physical-irq, the other
is still getting one already used by libata - I've checked the files
(included further down for sanity check) to make sure that I'm passing
different devices into each domU, so it appears the error is in Xen
3.0.3 checking irq allocation? I could be wrong - I'm not hugely
experienced with Xen.
I'm currently running fc6 development tree with these packages:
xen-libs-3.0.3-0.1.rc3
xen-3.0.3-0.1.rc3
kernel-xen-2.6.18-1.2798.fc6
Below are contents of various files to illustrate the problem:
#### dom0 - /proc/interrupts ####
1: 8 Phys-irq i8042
8: 1 Phys-irq rtc
9: 0 Phys-irq acpi
12: 145 Phys-irq i8042
14: 163663 Phys-irq ide0
15: 28233 Phys-irq ide1
16: 29 Phys-irq ohci_hcd:usb1
17: 0 Phys-irq ohci_hcd:usb2
18: 2 Phys-irq ehci_hcd:usb3
19: 326233 Phys-irq libata
20: 2487550 Phys-irq peth2
256: 319628 Dynamic-irq timer0
257: 0 Dynamic-irq resched0
258: 0 Dynamic-irq callfunc0
259: 5797 Dynamic-irq xenbus
260: 0 Dynamic-irq console
261: 69307 Dynamic-irq pciback
262: 40339 Dynamic-irq blkif-backend
263: 22 Dynamic-irq vif5.0
264: 326 Dynamic-irq pciback
265: 1675 Dynamic-irq blkif-backend
266: 21 Dynamic-irq vif6.0
#### domU - gw - /proc/interrupts ####
21: 9 Phys-irq eth1
256: 10037 Dynamic-irq timer0
257: 0 Dynamic-irq resched0
258: 0 Dynamic-irq callfunc0
259: 200 Dynamic-irq xenbus
260: 226 Dynamic-irq xencons
261: 1 Dynamic-irq xenfb
262: 0 Dynamic-irq xenkbd
263: 2596 Dynamic-irq blkif
264: 83 Dynamic-irq eth0
#### domU - www - /proc/interrupts - 19 is used by libata in the dom0 ####
19: 3644 Phys-irq eth1
256: 6384 Dynamic-irq timer0
257: 0 Dynamic-irq resched0
258: 0 Dynamic-irq callfunc0
259: 503 Dynamic-irq xenbus
260: 235 Dynamic-irq xencons
261: 1 Dynamic-irq xenfb
262: 0 Dynamic-irq xenkbd
263: 3209 Dynamic-irq blkif
264: 31 Dynamic-irq eth0
#### /etc/modprobe.conf in dom0 ####
alias eth0 tulip
alias eth1 tulip
alias eth2 r8169
alias scsi_hostadapter sata_sil
alias scsi_hostadapter1 sata_nv
options pciback hide=(0000:01:09.0)(0000:01:0a.0)
install tulip /sbin/modprobe pciback ; /sbin/modprobe --first-time
--ignore-install tulip
#### lspci on dom0 ####
00:00.0 Host bridge: nVidia Corporation nForce2 AGP (different version?)
(rev c1)
00:00.1 RAM memory: nVidia Corporation nForce2 Memory Controller 1 (rev c1)
00:00.2 RAM memory: nVidia Corporation nForce2 Memory Controller 4 (rev c1)
00:00.3 RAM memory: nVidia Corporation nForce2 Memory Controller 3 (rev c1)
00:00.4 RAM memory: nVidia Corporation nForce2 Memory Controller 2 (rev c1)
00:00.5 RAM memory: nVidia Corporation nForce2 Memory Controller 5 (rev c1)
00:01.0 ISA bridge: nVidia Corporation nForce2 ISA Bridge (rev a3)
00:01.1 SMBus: nVidia Corporation nForce2 SMBus (MCP) (rev a2)
00:02.0 USB Controller: nVidia Corporation nForce2 USB Controller (rev a3)
00:02.1 USB Controller: nVidia Corporation nForce2 USB Controller (rev a3)
00:02.2 USB Controller: nVidia Corporation nForce2 USB Controller (rev a3)
00:08.0 PCI bridge: nVidia Corporation nForce2 External PCI Bridge (rev a3)
00:09.0 IDE interface: nVidia Corporation nForce2 IDE (rev a2)
00:1e.0 PCI bridge: nVidia Corporation nForce2 AGP (rev c1)
01:08.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL-8169
Gigabit Ethernet (rev 10)
01:09.0 Ethernet controller: Lite-On Communications Inc LNE100TX (rev 20)
01:0a.0 Ethernet controller: Lite-On Communications Inc LNE100TX (rev 20)
01:0b.0 RAID bus controller: Silicon Image, Inc. SiI 3112
[SATALink/SATARaid] Serial ATA Controller (rev 02)
02:00.0 VGA compatible controller: ATI Technologies Inc Radeon R300 ND
[Radeon 9700 Pro]
02:00.1 Display controller: ATI Technologies Inc Radeon R300 [Radeon
9700 Pro] (Secondary)
And lastly, the files in /etc/xen to load the domU's where the pci cards
are passed in:
#### cat /etc/xen/gw ####
# Automatically generated xen config file
name = "gw"
memory = "500"
disk = [ 'phy:/dev/raid/xen_gw,xvda,w', ]
vif = [ 'mac=00:16:3e:11:d9:86, bridge=xenbr0', ]
vnc=1
vncunused=1
uuid = "34363550-43c2-e704-625d-a0193e8ad1c0"
bootloader="/usr/bin/pygrub"
vcpus=1
pci = ['0000:01:09.0']
on_reboot = 'restart'
on_crash = 'restart'
#### cat /etc/xen/www ####
# Automatically generated xen config file
name = "www"
memory = "500"
disk = [ 'phy:/dev/raid/xen_www,xvda,w', ]
vif = [ 'mac=00:16:3e:13:d2:86, bridge=xenbr0', ]
vnc=1
vncunused=1
uuid = "ddb45eb4-46ee-1feb-7195-c93f56094796"
bootloader="/usr/bin/pygrub"
vcpus=1
pci=['0000:01:0a.0']
on_reboot = 'restart'
on_crash = 'restart'
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