Kernel: F2FS, IBM POWER9, Zink
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F2FS With Linux 5.11 To Support Casefolding With Encryption - Phoronix
For over one year the Flash-Friendly File-System (F2FS) has supported case-folding for optional case-insensitive file/folder support. The past number of years F2FS has also supported FSCRYPT-based file encryption. But now as we roll into 2021, support is finally seemingly ready for mainline in supporting casefolding with encryption enabled.
The combination of having case-folding and encryption on the same data hasn't been supported by F2FS. For the past number of months the FSCRYPT file-system encryption framework leveraged by F2FS and other file-systems has been working on the case-folding with FSCRYPT and ironing out all those details.
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Linux Sees A Slew Of Point Releases Due To That Nasty IBM POWER9 Vulnerability - Phoronix
Greg Kroah-Hartman has issued new point releases for all of the Linux kernel series he is still maintaining as a result of that IBM POWER9 processor vulnerability plus other random fixes that have accumulated.
Made public on Friday was that IBM POWER9 processor vulnerability whereby the L1 data cache needs to be flushed when crossing privilege boundaries. To fend off the potential and improper leakage of L1 data if paired with other side channels, the Linux kernel by default is now set to flush the L1d when entering the kernel and on user accesses. As outlined in that prior article there are ways to disable that behavior but that is the new default on POWER9 processors. This is sure to hurt the performance and I'll have up some performance tests soon.
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Roundup 20201122
This was a (relatively) quiet week in zink-world.
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