Re: Virtio IRQ problem

[Fam Zheng <famz@redhat.com>]

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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