commit 46ac18c347b00be29b265c28209b0f3c38a1f142 upstream.

The increase_address_space() function has to check the PM_LEVEL_SIZE()
condition again under the domain->lock to avoid a false trigger of the
WARN_ON_ONCE() and to avoid that the address space is increase more
often than necessary.
Reported-by: NQian Cai <cai@lca.pw>
Fixes: 754265bcab78 ("iommu/amd: Fix race in increase_address_space()")
Reviewed-by: NJerry Snitselaar <jsnitsel@redhat.com>
Signed-off-by: NJoerg Roedel <jroedel@suse.de>
Signed-off-by: NWANG Siyuan <Siyuan.Wang@amd.com>
Acked-by: NCaspar Zhang <caspar@linux.alibaba.com>