[Bug 242023] bhyve pci_vtnet_rx broken after r354552

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=242023

            Bug ID: 242023
           Summary: bhyve pci_vtnet_rx broken after r354552
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: bhyve
          Assignee: virtualization at FreeBSD.org
          Reporter: woodsb02 at freebsd.org

I am running FreeBSD 13-CURRENT r354563, and when I boot my Windows 10 VM guest
it is crashing after ~5 seconds with the following error printed to the
console:

Assertion failed: (iov[0].iov_len >= sizeof(*hdr)), function pci_vtnet_rx, file
/usr/src/usr.sbin/bhyve/pci_virtio_net.c, line 272.

This appears that it could be a result of the recent change r354552 "bhyve: add
support for virtio-net mergeable rx buffers", as it added the line of code
referenced in the above error:
https://svnweb.freebsd.org/base?view=revision&revision=354552

The other thing that could be relevant is that this VM was recently upgraded to
Windows 10 version 1909. However, given the code that is crashing was only
added to head 8 days ago, that is my first guess at where the issue is.

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