Re: Virtio IRQ problem

[Pavel Davydov <pavel.davydov@hp.com>]

The proprietary system doesn't have a virtio driver, that is the problem.

What are the steps that Linux performs to work correctly with virtio 
devices?

Thank you,
Pavel

On 07/12/2015 05:31 PM, Fam Zheng wrote:
> On Fri, 07/10 22:34, Pavel Davydov wrote:
>> Hello,
>>
>> I've got the following problem with KVM:
>>
>> I'm running a proprietary OS under KVM, the OS is neither Linux/Unix, nor
>> Windows, and I don't get any IRQs from Virtio device. The Virtio device in
>> the system I'm running is a PCI Ethernet device. The device is detected
>> correctly, the IRQ line is also identified, its matches with the IRQ line
>> number retrieved by running lspci command when Linux is run instead of the
>> proprietary system.
>>
>> When Linux is run on exactly the same virtual machine configuration (with
>> the Virtio device), the Virtio device is detected and works correctly, there
>> is traffic between the host and the guest.
> Linux does more than detection, you need to have drivers running in the guest
> for virtio devices.
>
> Does your proprietary system have virtio device drivers?
>
> Fam
>
>> When the only change in the configuration is that the type of the virtual
>> network interface is changed from Virtio to E1000, in both OSes: the
>> proprietary OS and Linux, the virtual network interface works correctly.
>>
>> The question is: what steps is Virtio driver to perform to enable the IRQs?
>> (Obviously, Linux driver for Virtio performs these steps, the IRQs are
>> generated under Linux VM).
>>
>> Any hint would be appreciated.
>>
>> Thank you,
>> Pavel
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