Re: Test with VT-d patches

[gg@seh.de]

Hello,

I try to explain the current state on my pc.

1) The patch KVM 1/2 was applied with the following change.
   The files "drivers/pci/iova.h" and "drivers/pci/intel-iommu.h" already exists.
   And I get both files rejected.
   So I take the headers from the KVM 1/2 Patchfile and use these a "iova.h" and "intel-iommu.h".
   Kernel compiles without errors.

2) What known bug is in the latest userspace patchfile? (Told by Yang, Sheng)


>Hello,
>
>* On Wednesday 03 September 2008 14:07:36 gg@seh.de wrote:
>> Hi,
>>
>> i make some more tests with
>> 1) an old APCI1500/PCI card no linux driver support -> so i don't need to
>> unload the module. 2) my second network-card Realtek 10/100 MBit.
>>
>> Both don't work at all. Only my first gigabit-onboard-network-card starts.
>>
>> Here the output from userspace/dmesg:
>>
>>
>> 1) // Applied Micro Circuits Corp. APCI1500 Signal processing controller
>>
>> Warning: No DNS servers found
>> Registered host PCI device 03:00.0 ("03:00.0") as guest device 00:03.0
>> assigned_dev_update_irq: Input/output error
>> assigned_dev_update_irq: Input/output error
>
>This means the devices shares the irq with some other device in the system. 
>See the "lspci -v" output for details.
>
>> 2) // 03:02.0 Ethernet controller: Realtek Semiconductor Co., Ltd.
>> RTL-8139/8139C/8139C+ (rev 10) Registered host PCI device 03:02.0
>> ("03:02.0") as guest device 00:03.0 assigned_dev_update_irq: Input/output
>> error
>>
>> [  369.195971] pci 0000:03:02.0: PCI INT A -> GSI 18 (level, low) -> IRQ 18
>> [  369.326026] kvm_vm_ioctl_assign_irq: couldn't allocate irq for pv device
>
>Same error.
>
>> Sould i update the BIOS if possible/available?
>
>That's not necessary. We don't support assigning devices that share the irq on 
>
>the host with some other device. You can try inserting one device at a time 
>and try different PCI slots.
>
>> Could it be a problem with the already assigned patches? (See the first
>> E-Mail :The VTD [PATCH1/2] seems already be applied. )
>
>No patches have already been applied to any tree. You'll definitely have to 
>apply the 1/2 patch as well.

Ok. On both PCI-Cards (1) APCI1500 Signal processing controller and (2) Realtek NIC
the IRQ is shared with my USB-UHCI-Controller.
On this PC there is no PS2-Connector (USB-Mouse/USB-Keyboard). 
When I unload the usb module on the host, I can not handle the system anymore.

I can start qemu/kvm remote over a serial-console. But then I cannot use the guest system without keyboard/mouse. (login and so)

"Han, Weidong" told to use IRQF_SHARED in reqeust_irq(). In which code?

Both tests are only made to get an idea how it works with other devices.

My primary efforts are to use my onboard Gigabit with VT-d direct on the Windows guest-system. This device don't share the IRQ with an other device.
But I have the problems with:
1) slow down the complete system and generate this Unbalanced IRQ 21 messages.
2) Packet statistic under windows shows on this device no package traffic in live-network. (no ping etc. possible)

Thanks for your hints.

Gregor