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

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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>

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Marcelo Tosatti 2007-12-07 07:56:58 -05:00 • committed by Avi Kivity

parent 80a8119ca3

commit b3e4e63fd9

1 changed files with 34 additions and 2 deletions

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36

drivers/kvm/paging_tmpl.h

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