On Sun, 7 Jan 2018 14:32:22 +0200 Marcel Apfelbaum <[email protected]> wrote:
> Signed-off-by: Marcel Apfelbaum <[email protected]> > Signed-off-by: Yuval Shaia <[email protected]> > Reviewed-by: Shamir Rabinovitch <[email protected]> > --- > docs/pvrdma.txt | 254 > ++++++++++++++++++++++++++++++++++++++++++++++++++++++++ > 1 file changed, 254 insertions(+) > create mode 100644 docs/pvrdma.txt > +5. Limitations > +============== > +- The device obviously is limited by the Guest Linux Driver features > implementation > + of the VMware device API. > +- Memory registration mechanism requires mremap for every page in the buffer > in order > + to map it to a contiguous virtual address range. Since this is not the > data path > + it should not matter much. > +- The device requires target page size to be the same as the host page size. > +- QEMU cannot map guest RAM from a file descriptor if a pvrdma device is > attached, > + so it can't work with huge pages. The limitation will be addressed in the > future, > + however QEMU allocates Gust RAM with MADV_HUGEPAGE so if there are enough > huge s/Gust/Guest/ > + pages available, QEMU will use them. > +- As previously stated, migration is not supported yet, however with some > hardware > + support can be done.
