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doc: document ivshmem & hugepages 

Document and give some examples of hugepages support with ivshmem device
and server.

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
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Marc-André Lureau 2015-10-07 16:31:47 +02:00
parent f7a199b2b4
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@ -1293,6 +1293,19 @@ copy the shared memory on migration to the destination host. With
With the @option{peer} case, the device should be detached and then reattached
after migration using the PCI hotplug support.
@subsubsection ivshmem and hugepages
Instead of specifying the <shm size> using POSIX shm, you may specify
a memory backend that has hugepage support:
@example
qemu-system-i386 -object memory-backend-file,size=1G,mem-path=/mnt/hugepages,id=mb1
-device ivshmem,memdev=mb1
@end example
ivshmem-server also supports hugepages mount points with the
@option{-m} memory path argument.
@node direct_linux_boot
@section Direct Linux Boot