VMRun: allow running riscv64 guests with RVVM

[svmhdvn]

See individual commits.

NOTE: RVVM support requires upstream RVVM, not the current emulators/rvvm freebsd port. Currently pending the addition of emulators/rvvm-devel tracking upstream HEAD.

[markjdb]

I'm ok with this if we avoid silently disabling network in RVVM.

[svmhdvn]

Split out the other unrelated commits, will post PRs for those separately.

I've added a NetworkDriver.NONE enum value, that should handle the feedback you mentioned. Let me know if this looks good.

[markjdb]

Is the intent to use RVVM for running the regression test suite? The lack of networking means that we can't fetch the kyua report using scp.

[markjdb]

Looks ok to me in any case.

[markjdb]

(but there are some conflicts, sorry)

[svmhdvn]

Is the intent to use RVVM for running the regression test suite? The lack of networking means that we can't fetch the kyua report using scp.

RVVM has networking enabled by default, The -nonet is only necessary to disable networking.

[markjdb]

Is the intent to use RVVM for running the regression test suite? The lack of networking means that we can't fetch the kyua report using scp.

RVVM has networking enabled by default, The -nonet is only necessary to disable networking.

But we want to configure a specific address/port for ssh access, see ssh_addr in the VMRun class.

[svmhdvn]

Is the intent to use RVVM for running the regression test suite? The lack of networking means that we can't fetch the kyua report using scp.

RVVM has networking enabled by default, The -nonet is only necessary to disable networking.

But we want to configure a specific address/port for ssh access, see ssh_addr in the VMRun class.

Thanks for this info, I've updated it now to properly port forward the ssh addr and port. I've tested this with #22 and it works well.