Differential D23233

[PowerPC64] fix crash when using machdep.moea64_bpvo_pool_size tunable
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Authored by alfredo on Jan 17 2020, 2:03 PM.

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jhibbits
bdragon
nwhitehorn

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rS356896: [PowerPC64] fix crash when using machdep.moea64_bpvo_pool_size tunable

Summary

This fixes kernel crashing when tunable "machdep.moea64_bpvo_pool_size" is set to a value higher then 327680 (default value).
Function moea64_mid_bootstrap() relies on moea64_bpvo_pool_size, but at time of the use the variable wan't yet updated with the new value provided by user.

Problem was detected after trying to use a VM with 64GB of RAM, and default moea64_bpvo_pool_size is insufficient (kernel boot used more than 470000) .
I think default value must be discussed to address this use case, or find a way to calculate pool size automatically based on amount of memory detected.

Test Plan

Tested on QEMU VM with 64GB of RAM using "set machdep.moea64_bpvo_pool_size=655360" on loader prompt

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rS FreeBSD src repository - subversion

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Event Timeline

alfredo created this revision.Jan 17 2020, 2:03 PM

Herald added a subscriber: luporl. · View Herald TranscriptJan 17 2020, 2:03 PM

Harbormaster completed remote builds in B28732: Diff 66909.Jan 17 2020, 2:03 PM

jhibbits added inline comments.Jan 17 2020, 5:27 PM

sys/powerpc/aim/mmu_oea64.c
917 ↗	(On Diff #66909)	Having this here, shouldn't you delete the TUNABLE_INT() above on line 188?

This revision was not accepted when it landed; it landed in state Needs Review.Jan 19 2020, 9:18 PM

Closed by commit rS356896: [PowerPC64] fix crash when using machdep.moea64_bpvo_pool_size tunable (authored by jhibbits). · Explain Why

This revision was automatically updated to reflect the committed changes.

jhibbits added a commit: rS356896: [PowerPC64] fix crash when using machdep.moea64_bpvo_pool_size tunable.

Herald added a subscriber: imp. · View Herald TranscriptJan 19 2020, 9:18 PM

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head/

sys/

powerpc/

aim/

10 lines

Diff 67028

head/sys/powerpc/aim/mmu_oea64.c

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