[packages/microcode-data-intel/notes/commits] Notes added by 'git notes edit'
arekm at maven.pl
Fri Jan 12 09:55:50 CET 2018
On Friday 12 of January 2018, glen wrote:
> commit 41aaa0905d3c07a59862eeb06b905fe47a008759
> Author: Elan Ruusamäe <glen at pld-linux.org>
> Date: Fri Jan 12 10:07:43 2018 +0200
> Notes added by 'git notes edit'
> e7ade0a9a21df2fedff39166212ff64f60877f58 | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
> diff --git a/e7ade0a9a21df2fedff39166212ff64f60877f58
> b/e7ade0a9a21df2fedff39166212ff64f60877f58 index 6adaecd..d86d5d6 100644
> --- a/e7ade0a9a21df2fedff39166212ff64f60877f58
> +++ b/e7ade0a9a21df2fedff39166212ff64f60877f58
> @@ -1,3 +1,3 @@
> -microcode update to fix spectre and meltdown bugs
> +20180108: microcode update to fix spectre and meltdown bugs
It's very unlikely that this microcode FIXES anything.
- meltdown cannot be fixed on microcode level
- updated microcodes only provide support for IBRS ("indirect branch
restricted speculation") which requires OS support to be activated and it is
used to mitigate Spectre Variant 2. IBRS is also very slow in many cases.
At this moment upstream and PLD linux kernels don't have capability to use
The other mitigation for Spectre v2 is software only "retpoline" (return
trampoline) feature that doesn't use IBRS, is faster, and is going to be
default for most of CPUs (when merged at upstream kernel).
Arkadiusz Miśkiewicz, arekm / ( maven.pl | pld-linux.org )
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