[Bug 236922] Virtio fails as QEMU-KVM guest with Q35 chipset on Ubuntu 18.04.2 LTS

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=236922

--- Comment #47 from John Hartley <drum at graphica.com.au> ---
(In reply to Vincenzo Maffione from comment #46)

Hi Vincenzo,

I was attempting to get machine with: Q35, OVMF, 12.1, VirtIO, all networking
(em, vmx, re, vtnet).

Thank for tip on ND, D & RD debug macros, that did get me past compile error
but did not get me to working VirtIO.

I wound out the defined(DEV_NETMAP) && defined(WITH_PTNETMAP) hack which was my
amateur attempt to try to get this to work as Tommy's version removed all ifdef
DEV_NETMAP surrounded compilation which seem a bit drastic to me.

My final 12.1 virtio with netmap fix merge was:

1. Use patched netmap
2. Use patched virtio (with exception of network)
3. Use base virtio network
4. Update code to avoid netmap debug macro compile errors: D, RD & ND as per
your guidance

Against clean install the differences is over 3000 lines....
So huge effort on VirtIO by Tommy P and Brian V.

I am doing to now wait potentially for the updates to flow through.

Cheers,

John Hartley.

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