Christoph Hellwig wrote:
> 
> This ties up Gerd Hoffmann's unmegred preadv/pwritev syscalls to qemu.  Use with
> care as the syscall numbers aren't finalized yet.
> 
> If someone of the BSD folks is interested it should be trivial to tie this up
> for the preadv/pwritev syscalls that have been around there for a while.
> 
> Probably wants some optimization to not try preadv/pwritev again once we got
> the first ENOSYS.

See $patch I've hacked up a while ago.  I think it already ran over the
list a while ago, /me was waiting for the preadv kernel patches hitting
mainline before trying to re-submit with the final syscall numbers and
the warning removed.

It provides qemu_p{read,write}v() functions.  Adds autoconf check for
*BSD, does linux syscall windup, runtime check and emulation for old
kernels.

HTH,
  Gerd