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powerpc/pseries: Fix update of LPAR security flavor after LPM

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After LPM, when migrating from a system with security mitigation enabled
to a system with mitigation disabled, the security flavor exposed in
/proc is not correctly set back to 0.

Do not assume the value of the security flavor is set to 0 when entering
init_cpu_char_feature_flags(), so when called after a LPM, the value is
set correctly even if the mitigation are not turned off.

Fixes: 6ce56e1ac3 ("powerpc/pseries: export LPAR security flavor in lparcfg")
Cc: stable@vger.kernel.org # v5.13+
Signed-off-by: Laurent Dufour <ldufour@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20210805152308.33988-1-ldufour@linux.ibm.com
This commit is contained in:
Laurent Dufour 2021-08-05 17:23:08 +02:00 committed by Michael Ellerman
parent 8241461536
commit c18956e6e0
1 changed files with 3 additions and 2 deletions
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5
arch/powerpc/platforms/pseries/setup.c
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@ -539,9 +539,10 @@ static void init_cpu_char_feature_flags(struct h_cpu_char_result *result)
* H_CPU_BEHAV_FAVOUR_SECURITY_H could be set only if
* H_CPU_BEHAV_FAVOUR_SECURITY is.
*/
if (!(result->behaviour & H_CPU_BEHAV_FAVOUR_SECURITY))
if (!(result->behaviour & H_CPU_BEHAV_FAVOUR_SECURITY)) {
security_ftr_clear(SEC_FTR_FAVOUR_SECURITY);
else if (result->behaviour & H_CPU_BEHAV_FAVOUR_SECURITY_H)
pseries_security_flavor = 0;
} else if (result->behaviour & H_CPU_BEHAV_FAVOUR_SECURITY_H)
pseries_security_flavor = 1;
else
pseries_security_flavor = 2;