tree a7e1cd372a26b36d9fc4d6a7a12523e07f7a9f5e
parent 80a8119ca3f021037b8513d39dbb0ffd1af86b20
author Marcelo Tosatti <marcelo@kvack.org> 1197032218 -0500
committer Avi Kivity <avi@qumranet.com> 1201708399 +0200

KVM: MMU: Use cmpxchg for pte updates on walk_addr()

In preparation for multi-threaded guest pte walking, use cmpxchg()
when updating guest pte's. This guarantees that the assignment of the
dirty bit can't be lost if two CPU's are faulting the same address
simultaneously.

[avi: fix kunmap_atomic() parameters]

Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Signed-off-by: Avi Kivity <avi@qumranet.com>