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authorBorislav Petkov <borislav.petkov@amd.com>2009-12-11 18:14:40 +0100
committerH. Peter Anvin <hpa@zytor.com>2009-12-11 10:59:21 -0800
commit505422517d3f126bb939439e9d15dece94e11d2c (patch)
treea2d58c0b3cdf2b1c6b66eee6d78a283224ae1ac3 /arch/x86/include/asm/msr.h
parent5c6baba84e1ac6a79b266b40e17e692aab6604a1 (diff)
downloadop-kernel-dev-505422517d3f126bb939439e9d15dece94e11d2c.zip
op-kernel-dev-505422517d3f126bb939439e9d15dece94e11d2c.tar.gz
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 'arch/x86/include/asm/msr.h')
-rw-r--r--arch/x86/include/asm/msr.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/arch/x86/include/asm/msr.h b/arch/x86/include/asm/msr.h
index 5bef931..2d228fc 100644
--- a/arch/x86/include/asm/msr.h
+++ b/arch/x86/include/asm/msr.h
@@ -244,6 +244,9 @@ do { \
#define write_rdtscp_aux(val) wrmsr(0xc0000103, (val), 0)
+struct msr *msrs_alloc(void);
+void msrs_free(struct msr *msrs);
+
#ifdef CONFIG_SMP
int rdmsr_on_cpu(unsigned int cpu, u32 msr_no, u32 *l, u32 *h);
int wrmsr_on_cpu(unsigned int cpu, u32 msr_no, u32 l, u32 h);
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