Re: Test with VT-d patches

[gg@seh.de]

Hello,

with the hint/patches from "Han, Weidong" I cound correct my system-build and now the NIC works fine under Windows.
Only the "Unbalanced enables for IRQ 21" (my pci-passed throug Gigabit NIC)commes nearly endless. (not importend for me)

I am happy now.
Thanks all,

Gregor


>On Thursday 04 September 2008 17:12:28 Han, Weidong wrote:
>> gg@seh.de wrote:
>> > 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)
>>
>
>I think it's mentioned by Ben that userspace patch refer a kvm fd before it 
>was initialized correctly. (patch at 2008-08-26, Hope I don't miss any update 
>
>on this... ) 
>
>> in add_assigned_device(), you can simply comment out some lines between
>> following #ifdef and #endif as follows.
>>
>> +#ifdef KVM_CAP_IOMMU
>> //+	r = kvm_check_extension(kvm_context, KVM_CAP_IOMMU);
>> //+	if (r)
>> +		assigned_devices[nr_assigned_devices].dma |=
>> +			KVM_DEV_ASSIGN_ENABLE_IOMMU;
>> +
>> //+	r = get_param_value(dma, sizeof dma, "dma", arg);
>> //+	if (r && !strncmp(dma, "none", 4)) {
>> //+		assigned_devices[nr_assigned_devices].dma &=
>> //+			~KVM_DEV_ASSIGN_ENABLE_IOMMU;
>> +	}
>> +#endif
>>
>
>Yeah, as this workaround.
>
>> Randy (Weidong)
>>
>> >> 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.
>
>Well, another choice is use VNC from anyother machine. 
>
>> >
>> > 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?
>
>kvm_vm_ioctl_assign_irq() in x86.c. But for you are using keyboard and mouse, 
>
>I think it would cause chaos? Maybe you can tell USB 2.0 controller apart 
>from USB 1.1, and just unload 2.0 ones. The USB 1.1 is UHCI while 2.0 is 
>EHCI, the drivers can be made as modules.
>
>> >
>> > 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)
>
>No clue, if you ensure that you've got latest version of patch... I think it 
>was posted by Amit at 2008-08-26.
>
>BTW: Can you try a new Linux guest if possible? 
>
>-- 
>regards
>Yang, Sheng
>
>> >
>> > Thanks for your hints.
>> >
>> > Gregor