16.04.2016 18:54, Guido Trentalancia пишет:
Hello Andrei,
thanks for getting back on this...
On Sat, 16/04/2016 at 09.01 +0300, Andrei Borzenkov wrote:
16.04.2016 02:18, Guido Trentalancia пишет:
This is the initial version of a new "microcode" dracut module
that can be used to update the microcode on Intel(R) CPUs.
??? dracut already supports early microcode loading, why it is not
enough and what problem this patch solves?
To be honest, I didn't notice it. I was expecting such support, if
available, to be a module and I couldn't find it, so I wrote it.
However, I have noticed it is much simpler than the actual
implementation. It doesn't differentiate between Intel and AMD (why it
should ?), it just loads the microcode in the standard location as
defined by the microcode update utility.
The microcode update utility stopped working when a Haswell microcode
update got released that makes some CPU instructions illegal (because
they didn't work properly in the first place). Please see
http://bugs.debian.org/762195
Sure, glibc no longer uses these instructions, but now (exactly to avoid
repetition of this bug) the only supported way to update the microcode
is to place it in the initcpio so that "early microcode update" in the
kernel loader notices it.
--
Alexander E. Patrakov
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