** Tags removed: kernel-da-key
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Title:
With intel-microcode 3.20180312, kernel reports as broken spectre v2
microcode
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Now fixed here too, on 4.15.0-14 kernel
oem@ubuntu:~$ journalctl -b | grep Spectre
Apr 04 08:40:23 ubuntu kernel: Spectre V2 : Mitigation: Full generic retpoline
Apr 04 08:40:23 ubuntu kernel: Spectre V2 : Spectre v2 mitigation: Filling RSB
on context switch
Apr 04 08:40:23 ubuntu kernel: Spectre
Also discussed here: https://lkml.org/lkml/2018/2/12/123
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Title:
With intel-microcode 3.20180312, kernel reports as broken spectre v2
microcode
Thanks Steve for the head up
my cpu is i5-6500 and it seems it should not be blacklisted now (at least the
request has been done):
http://lists-archives.com/linux-kernel/29038556-x86-spectre_v2-remove-0xc2-from-spectre_bad_microcodes.html
Initially i have been confused by the 20180312 vs 2017-
Hi dino99,
Microcode rev 0xc2 looks to be the correct revision for your processor:
$ iucode-tool -L microcode-20180312.dat | grep 506e3
01/147: sig 0x000506e3, pf mask 0x36, 2017-11-16, rev 0x00c2, size 99328
(You can perform a similar check on the specific microcode for your
processor on
More tests:
- purging intel-microcode & iucode-tool, then rebooting, i get:
kernel: [Firmware Bug]: TSC_DEADLINE disabled due to Errata; please update
microcode to version: 0xb2 (or later)
- reinstalling the 2 packages above (3.20180312.0~ubuntu18.04.1) and rebooting,
i get:
kernel: microcode:
So i have reinstalled both intel-microcode & iucode-tool and then rebooted.
Still get the latest microcode version with the error; even if the reinstall
has not displayed warning/error and the kernel rebuilt as expected.
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B
Something abnormal:
- installed: intel-microcode (3.20180312.0~ubuntu18.04.1) bionic
- but log shows: microcode: microcode updated early to revision 0xc2,
date = 2017-11-16
Looks like the latest upgrade is not use by the kernel.
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>From the 4.15.0.12-13 still get the error
oem@ubuntu:~$ journalctl -b | grep microcode
kernel: microcode: microcode updated early to revision 0xc2, date = 2017-11-16
kernel: Intel Spectre v2 broken microcode detected; disabling Speculation
Control
kernel: microcode: sig=0x506e3, pf=0x2, revision
4.15.0-12.13-generic from bionic-proposed is also working for me.
Relevant CPU model info (same as in description):
cpu family : 6
model : 142
model name : Intel(R) Core(TM) i7-7500U CPU @ 2.70GHz
stepping: 9
microcode : 0x84
Model 142 corresponds to 0x8E in hex,
4.15.0-12.13-generic, from bionic-proposed, fixes this bug for me due to
it containing this upstream commit:
1751342095f0d2b36fa8114d8e12c5688c455ac4
Relevant CPU model info from /proc/cpuinfo:
cpu family : 6
model : 78
model name : Intel(R) Core(TM) m5-6Y54 CPU @ 1.10GHz
ste
Would it be possible for those that can reproduced this bug to test the
proposed kernel and post back if it resolves this bug?
See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how
to enable and use -proposed.
Thank you in advance!
** Changed in: linux (Ubuntu)
Importance:
** Changed in: linux (Ubuntu)
Status: Incomplete => Confirmed
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Title:
With intel-microcode 3.20180312, kernel reports as broken spectre v2
I see the same issue on my Skylake desktop (sig=0x506e3). The microcode
updates at startup (microcode: microcode updated early to revision 0xc2,
date = 2017-11-16) but I still get "Intel Spectre v2 broken microcode
detected; disabling Speculation Control". I also tested it on Ivy
Bridge, Broadwel
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