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Re: [PATCH] x86/ucode/intel: Improve description for gathering the microcode revision

To: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
From: Jan Beulich <jbeulich@xxxxxxxx>
Date: Tue, 13 Oct 2020 16:08:33 +0200
Cc: Xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, Wei Liu <wl@xxxxxxx>
Delivery-date: Tue, 13 Oct 2020 14:08:41 +0000
List-id: Xen developer discussion <xen-devel.lists.xenproject.org>

On 12.10.2020 16:25, Andrew Cooper wrote:
> Obtaining the microcode revision on Intel CPUs is complicated for backwards
> compatibility reasons.  Update apply_microcode() to use a slightly more
> efficient CPUID invocation, now that the documentation has been updated to
> confirm that any CPUID instruction is fine, not just CPUID.1
> 
> Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>

Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx>

References:
- [PATCH] x86/ucode/intel: Improve description for gathering the microcode revision
  - From: Andrew Cooper

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