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| author | Borislav Petkov <borislav.petkov@amd.com> | 2009-12-11 18:14:40 +0100 |
|---|---|---|
| committer | H. Peter Anvin <hpa@zytor.com> | 2009-12-11 10:59:21 -0800 |
| commit | 505422517d3f126bb939439e9d15dece94e11d2c (patch) | |
| tree | a2d58c0b3cdf2b1c6b66eee6d78a283224ae1ac3 /Documentation/sysctl | |
| parent | 5c6baba84e1ac6a79b266b40e17e692aab6604a1 (diff) | |
| download | linux-505422517d3f126bb939439e9d15dece94e11d2c.tar.gz linux-505422517d3f126bb939439e9d15dece94e11d2c.tar.bz2 linux-505422517d3f126bb939439e9d15dece94e11d2c.zip | |
x86, msr: Add support for non-contiguous cpumasks
The current rd/wrmsr_on_cpus helpers assume that the supplied
cpumasks are contiguous. However, there are machines out there
like some K8 multinode Opterons which have a non-contiguous core
enumeration on each node (e.g. cores 0,2 on node 0 instead of 0,1), see
http://www.gossamer-threads.com/lists/linux/kernel/1160268.
This patch fixes out-of-bounds writes (see URL above) by adding per-CPU
msr structs which are used on the respective cores.
Additionally, two helpers, msrs_{alloc,free}, are provided for use by
the callers of the MSR accessors.
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Mauro Carvalho Chehab <mchehab@redhat.com>
Cc: Aristeu Rozanski <aris@redhat.com>
Cc: Randy Dunlap <randy.dunlap@oracle.com>
Cc: Doug Thompson <dougthompson@xmission.com>
Signed-off-by: Borislav Petkov <borislav.petkov@amd.com>
LKML-Reference: <20091211171440.GD31998@aftab>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Diffstat (limited to 'Documentation/sysctl')
0 files changed, 0 insertions, 0 deletions