CVS commit: src/sys/arch/x86/x86

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

Module Name:    src
Committed By:   bouyer
Date:           Thu Dec 13 21:22:18 UTC 2007

Modified Files:
        src/sys/arch/x86/x86: pmap.c

Log Message:
Reorder some operations for better handling of failures in
xpq_update_foreign(). Note that this also affects native operations, but it
shoulnd't cause problems even for SMP system. Proposed on port-amd64@ and
port-i386@

Don't invalidate the recursive PTE entry in user pmap when switching from
kernel to userland on Xen/amd64. This effectively means that a userland
process can read its own page tables (no write, of course) on Xen/amd64, but
it shouldn't cause security issue (discussed on tech-kern@ some time ago).
This makes NetBSD Xen/amd64 more than 10x faster
building pkgsrc/pkgtools/digest


To generate a diff of this commit:
cvs rdiff -r1.13 -r1.14 src/sys/arch/x86/x86/pmap.c

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