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KVM: MMU: Use cmpxchg for pte updates on walk_addr()
authorMarcelo Tosatti <marcelo@kvack.org>
Fri, 7 Dec 2007 12:56:58 +0000 (07:56 -0500)
committerAvi Kivity <avi@qumranet.com>
Wed, 30 Jan 2008 15:53:19 +0000 (17:53 +0200)
commitb3e4e63fd9ee8cd5d9047b89e0d463d5c48ee5b5
treea7e1cd372a26b36d9fc4d6a7a12523e07f7a9f5etree | snapshot (tar.gz zip)
parent80a8119ca3f021037b8513d39dbb0ffd1af86b20commit | diff
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>
drivers/kvm/paging_tmpl.h diff | blob | blame | history