Re: [PATCH] perf/x86: check ucode before disabling PEBS on SandyBridge

Borislav Petkov
2012-06-12T21:04:16Z

On Tue, Jun 12, 2012 at 01:58:23PM -0700, H. Peter Anvin wrote:
> There is a difference here. Mixed steppings or even mixed CPUs are,
> indeed, supported (even things like Nehalem + Westmere in the same
> system). However, the notion is that we should upload the *entire set*
> of microcodes to the kernel, and let it flash the appropriate one into
> each CPU.

Sure, the ucode driver both on Intel and AMD does that already by
looking at each patch in the blob. I'd expect no change to that
functionality.

> This may result in different version number on different CPUs.

Ok, understood.

Thanks.

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