CVS commit: src/sys/uvm

["Manuel Bouyer" <bouyer%netbsd.org@localhost>]

Module Name:    src
Committed By:   bouyer
Date:           Mon Feb 20 19:14:24 UTC 2012

Modified Files:
        src/sys/uvm: uvm_km.c uvm_kmguard.c uvm_map.c

Log Message:
When using uvm_km_pgremove_intrsafe() make sure mappings are removed
before returning the pages to the free pool. Otherwise, under Xen,
a page which still has a writable mapping could be allocated for
a PDP by another CPU and the hypervisor would refuse it (this is
PR port-xen/45975).
For this, move the pmap_kremove() calls inside uvm_km_pgremove_intrsafe(),
and do pmap_kremove()/uvm_pagefree() in batch of (at most) 16 entries
(as suggested by Chuck Silvers on tech-kern@, see also
http://mail-index.netbsd.org/tech-kern/2012/02/17/msg012727.html and
followups).


To generate a diff of this commit:
cvs rdiff -u -r1.121 -r1.122 src/sys/uvm/uvm_km.c
cvs rdiff -u -r1.9 -r1.10 src/sys/uvm/uvm_kmguard.c
cvs rdiff -u -r1.314 -r1.315 src/sys/uvm/uvm_map.c

Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.