Re: [PATCH] kvm tools: adds a PCI device that exports a host shared segment as a PCI BAR in the guest

[Pekka Enberg <penberg@kernel.org>]

On 8/25/11 8:22 AM, Alexander Graf wrote:
>
> On 25.08.2011, at 00:11, Pekka Enberg wrote:
>
>> On Wed, 2011-08-24 at 23:52 -0500, Alexander Graf wrote:
>>>> Isn't ivshmem in QEMU? If so, then I don't think there isn't any
>>>> competition. How do you feel that these are competing?
>>>
>>> Well, it means that you will inside the guest have two different
>>> devices depending whether you're using QEMU or kvm-tool. I don't see
>>> the point in exposing different devices to the guest just because of
>>> NIH. Why should a guest care which device emulation framework you're
>>> using?
>>
>> It's a pretty special-purpose device that requires user configuration so
>> I don't consider QEMU compatibility to be mandatory. It'd be nice to
>> have but not something to bend over backwards for.
>
> Well, the nice thing is that you would get the guest side for free:
>
> http://gitorious.org/nahanni/guest-code/blobs/master/kernel_module/uio/uio_ivshmem.c
>
> You also didn't invent your own virtio protocol, no? :)

No, because virtio drivers are in Linux kernel proper. Is ivshmem in the 
kernel tree
or planned to be merged at some point?

                         Pekka