[Qemu-devel] virtio-vsock feature has no TCG (non-KVM) support

[Qemu-devel] virtio-vsock feature has no TCG (non-KVM) support

[Artem Pisarenko]

Please, add important note to https://wiki.qemu.org/Features/VirtioVsock page,
that this feature only supported in KVM accelerated mode. It's not obvious.
Furthermore, it isn't checked by qemu when invoking with "-device
vhost-vsock-pci,..." and user encounters this only when communicating (via
AF_VSOCK) application fails to connect() with weird "Connection timed out"
error.
-- 

С уважением,
  Артем Писаренко

Re: [Qemu-devel] virtio-vsock feature has no TCG (non-KVM) support

[Stefan Hajnoczi]

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On Fri, Jun 01, 2018 at 04:15:52PM +0600, Artem Pisarenko wrote:
> Please, add important note to https://wiki.qemu.org/Features/VirtioVsock page,
> that this feature only supported in KVM accelerated mode. It's not obvious.
> Furthermore, it isn't checked by qemu when invoking with "-device
> vhost-vsock-pci,..." and user encounters this only when communicating (via
> AF_VSOCK) application fails to connect() with weird "Connection timed out"
> error.

Hi Artem,
Thanks for letting me know this is broken.  In principle it should work
because the kernel vhost drivers are independent of KVM and QEMU already
implements the ioeventfd mechanism that vhost needs in TCG mode.

I've added it to my todo list.

Stefan

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