tree fae9f967cff6fa82ec939db85f676dda5caef8e8
parent 063b8271ec8f706d833e61dfca40c512504a62c1
author Stefano Stabellini <stefanos@xilinx.com> 1559083702 -0700
committer Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> 1559743766 -0400

xen/swiotlb: don't initialize swiotlb twice on arm64

On arm64 swiotlb is often (not always) already initialized by mem_init.
We don't want to initialize it twice, which would trigger a second
memory allocation. Moreover, the second memory pool is typically made of
high pages and ends up replacing the original memory pool of low pages.
As a side effect of this change, it is possible to have low pages in
swiotlb-xen on arm64.

Signed-off-by: Stefano Stabellini <stefanos@xilinx.com>
Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>