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| author | Laurent Dufour <ldufour@linux.ibm.com> | 2021-03-05 15:55:54 +0300 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2021-03-26 15:19:41 +0300 |
| commit | 6ce56e1ac380eaa088d3f4c01446e15e195bd541 (patch) | |
| tree | 1d67aae2085da9a6b6e0e88c264a782957d43273 /arch/powerpc/platforms/pseries/lparcfg.c | |
| parent | 90cbac0e995dd92f7bcf82f74aa50250bf194a4a (diff) | |
| download | linux-6ce56e1ac380eaa088d3f4c01446e15e195bd541.tar.xz | |
powerpc/pseries: export LPAR security flavor in lparcfg
This is helpful to read the security flavor from inside the LPAR.
In /sys/kernel/debug/powerpc/security_features it can be seen if
mitigations are on or off but not the level set through the ASMI menu.
Furthermore, reporting it through /proc/powerpc/lparcfg allows an easy
processing by the lparstat command [1].
Export it like this in /proc/powerpc/lparcfg:
$ grep security_flavor /proc/powerpc/lparcfg
security_flavor=1
Value follows what is documented on the IBM support page [2]:
0 Speculative execution fully enabled
1 Speculative execution controls to mitigate user-to-kernel attacks
2 Speculative execution controls to mitigate user-to-kernel and
user-to-user side-channel attacks
[1] https://groups.google.com/g/powerpc-utils-devel/c/NaKXvdyl_UI/m/wa2stpIDAQAJ
[2] https://www.ibm.com/support/pages/node/715841
Signed-off-by: Laurent Dufour <ldufour@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20210305125554.5165-1-ldufour@linux.ibm.com
Diffstat (limited to 'arch/powerpc/platforms/pseries/lparcfg.c')
| -rw-r--r-- | arch/powerpc/platforms/pseries/lparcfg.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/powerpc/platforms/pseries/lparcfg.c b/arch/powerpc/platforms/pseries/lparcfg.c index e278390ab28d..f71eac74ea92 100644 --- a/arch/powerpc/platforms/pseries/lparcfg.c +++ b/arch/powerpc/platforms/pseries/lparcfg.c @@ -537,6 +537,8 @@ static int pseries_lparcfg_data(struct seq_file *m, void *v) parse_em_data(m); maxmem_data(m); + seq_printf(m, "security_flavor=%u\n", pseries_security_flavor); + return 0; } |