Re: [Xen-devel] [PATCH] x86: Move microcode loading earlier

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 18.04.17 at 17:47, <ross.lagerwall@xxxxxxxxxx> wrote:
> Move microcode loading earlier for the boot CPU and secondary CPUs so
> that it takes place before identify_cpu() is called for each CPU.
> Without this, the detected features may be wrong if the new microcode
> loading adjusts the feature bits. That could mean that some fixes (e.g.
> d6e9f8d4f35d ("x86/vmx: fix vmentry failure with TSX bits in LBR"))
> don't work as expected.
> 
> Previously during boot, the microcode loader was invoked for each
> secondary CPU started and then again for each CPU as part of an
> initcall. Simplify the code so that it is invoked exactly once for each
> CPU during boot.

The elimination of those pre-SMP initcalls makes it rather desirable to
also remove the respective ordering comment from x86/Makefile.

Jan


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