122d5d2429af7f0ca0fecf4ae71f
author Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com> 1344515439 +0900
committer Rusty Russell <rusty@rustcorp.com.au> 1348810512 +0930

virtio/console: Add splice_write support

Enable to use splice_write from pipe to virtio-console port.
This steals pages from pipe and directly send it to host.

Note that this may accelerate only the guest to host path.

Changes in v2:
 - Use GFP_KERNEL instead of GFP_ATOMIC in syscall context function.

Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Acked-by: Amit Shah <amit.shah@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
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