On 09/01/2018 11:17, Cornelia Huck wrote:
On Sun, 7 Jan 2018 14:32:22 +0200
Marcel Apfelbaum <mar...@redhat.com> wrote:
Signed-off-by: Marcel Apfelbaum <mar...@redhat.com>
Signed-off-by: Yuval Shaia <yuval.sh...@oracle.com>
Reviewed-by: Shamir Rabinovitch <shamir.rabinovi...@oracle.com>
---
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/
Fixed (for V7)
Thanks!
Marcel
+ pages available, QEMU will use them.
+- As previously stated, migration is not supported yet, however with some
hardware
+ support can be done.
