晋太元中，武陵人捕鱼为业。缘溪行，忘路之远近。忽逢桃花林，夹岸数百步，中无杂树，芳草鲜美，落英缤纷。渔人甚异之，复前行，欲穷其林。 　　林尽水源，便得一山，山有小口，仿佛若有光。便舍船，从口入。初极狭，才通人。复行数十步，豁然开朗。土地平旷，屋舍俨然，有良田、美池、桑竹之属。阡陌交通，鸡犬相闻。其中往来种作，男女衣着，悉如外人。黄发垂髫，并怡然自乐。 　　见渔人，乃大惊，问所从来。具答之。便要还家，设酒杀鸡作食。村中闻有此人，咸来问讯。自云先世避秦时乱，率妻子邑人来此绝境，不复出焉，遂与外人间隔。问今是何世，乃不知有汉，无论魏晋。此人一一为具言所闻，皆叹惋。余人各复延至其家，皆出酒食。停数日，辞去。此中人语云：“不足为外人道也。”(间隔 一作：隔绝) 　　既出，得其船，便扶向路，处处志之。及郡下，诣太守，说如此。太守即遣人随其往，寻向所志，遂迷，不复得路。 　　南阳刘子骥，高尚士也，闻之，欣然规往。未果，寻病终。后遂无问津者。 .
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Current File : //proc/thread-self/root/usr/share/doc/microcode_ctl/caveats/06-8c-01_readme
Some Intel Tiger Lake-UP3/UP4 CPU models (TGL, family 6, model 140, stepping 1)
had reports of system hangs when a microcode update, that was included
since microcode-20201110 update, was applied[1].  In order to address this,
microcode update had been disabled by default on these systems.  The revision
0x88 seems to have fixed the aforementioned issue, hence it is enabled
by default (but can be disabled explicitly; see below).

[1] https://github.com/intel/Intel-Linux-Processor-Microcode-Data-Files/issues/44

For the reference, SHA1 checksums of 06-8c-01 microcode files containing
microcode revisions in question are listed below:
 * 06-8c-01, revision 0x68: 2204a6dee1688980cd228268fdf4b6ed5904fe04
 * 06-8c-01, revision 0x88: 61b6590feb2769046d5b0c394179beaf2df51290
 * 06-8c-01, revision 0x9a: 48b3ae8d27d8138b5b47052d2f8184bf555ad18e
 * 06-8c-01, revision 0xa4: 70753f54f5be84376bdebeb710595e4dc2f6d92f
 * 06-8c-01, revision 0xa6: fdcf89e3a15a20df8aeee215b78bf5d13d731044
 * 06-8c-01, revision 0xaa: cf84883f6b3184690c25ccade0b10fa839ac8657
 * 06-8c-01, revision 0xac: b9f342e564a0be372ed1f4709263bf811feb022a
 * 06-8c-01, revision 0xb4: 6596bb8696cde85538bb833d090f0b7a42d6ae14
 * 06-8c-01, revision 0xb6: 76556e8248a89f38cd55a6c83dccc995ba176091
 * 06-8c-01, revision 0xb8: 6e9b138d1db2934479b179af4a3a19e843c4b4e4

Please contact your system vendor for a BIOS/firmware update that contains
the latest microcode version.  For the information regarding microcode versions
required for mitigating specific side-channel cache attacks, please refer
to the following knowledge base articles:
 * CVE-2020-8695 (Information disclosure issue in Intel SGX via RAPL interface),
   CVE-2020-8696 (Vector Register Leakage-Active),
   CVE-2020-8698 (Fast Forward Store Predictor):
   https://access.redhat.com/articles/5569051
 * CVE-2020-24489 (VT-d-related Privilege Escalation),
   CVE-2020-24511 (Improper Isolation of Shared Resources),
   CVE-2020-24512 (Observable Timing Discrepancy),
   CVE-2020-24513 (Information Disclosure on Some Intel Atom Processors):
   https://access.redhat.com/articles/6101171
 * CVE-2021-0145 (Fast store forward predictor - Cross Domain Training):
   https://access.redhat.com/articles/6716541
 * CVE-2022-21123 (Shared Buffers Data Read):
   https://access.redhat.com/articles/6963124

The information regarding disabling microcode update is provided below.

To disable 06-8c-01 microcode updates for a specific kernel
version, please create a file "disallow-intel-06-8c-01" inside
/lib/firmware/<kernel_version> directory, run
"/usr/libexec/microcode_ctl/update_ucode" to remove it from the firmware
directory where microcode is available for late microcode update, and run
"dracut -f --kver <kernel_version>", so initramfs for this kernel version
is regenerated, for example:

    touch /lib/firmware/3.10.0-862.9.1/disallow-intel-06-8c-01
    /usr/libexec/microcode_ctl/update_ucode
    dracut -f --kver 3.10.0-862.9.1

To avoid addition of this microcode for all kernels, please create file
"/etc/microcode_ctl/ucode_with_caveats/disallow-intel-06-8c-01", run
"/usr/libexec/microcode_ctl/update_ucode" for late microcode updates,
and "dracut -f --regenerate-all" for early microcode updates:

    mkdir -p /etc/microcode_ctl/ucode_with_caveats
    touch /etc/microcode_ctl/ucode_with_caveats/disallow-intel-06-8c-01
    /usr/libexec/microcode_ctl/update_ucode
    dracut -f --regenerate-all

Please refer to /usr/share/doc/microcode_ctl/README.caveats for additional
information.

haha - 2025