tree e1fff08e9e152c580dce839151e376395ea3715f
parent 44e3ee8a2aaee5df49cd440446fee4525144255f
author aliguori <aliguori@c046a42c-6fe2-441c-8c8c-71466251a162> 1232643564 +0000
committer aliguori <aliguori@c046a42c-6fe2-441c-8c8c-71466251a162> 1232643564 +0000

Vectored block device API (Avi Kivity)

Most devices that are capable of DMA are also capable of scatter-gather.
With the memory mapping API, this means that the device code needs to be
able to access discontiguous host memory regions.

For block devices, this translates to vectored I/O.  This patch implements
an aynchronous vectored interface for the qemu block devices.  At the moment
all I/O is bounced and submitted through the non-vectored API; in the future
we will convert block devices to natively support vectored I/O wherever
possible.

Signed-off-by: Avi Kivity <avi@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>


git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@6397 c046a42c-6fe2-441c-8c8c-71466251a162