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Re: [Xen-devel] [PATCH v4 for 4.13] x86/microcode: refuse to load the same revision ucode
- To: Juergen Gross <jgross@xxxxxxxx>
- From: Sergey Dyasli <sergey.dyasli@xxxxxxxxxx>
- Date: Wed, 27 Nov 2019 10:08:29 +0000
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- Cc: "sergey.dyasli@xxxxxxxxxx >> Sergey Dyasli" <sergey.dyasli@xxxxxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, xen-devel@xxxxxxxxxxxxx, Jan Beulich <jbeulich@xxxxxxxx>, Chao Gao <chao.gao@xxxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>
- Delivery-date: Wed, 27 Nov 2019 10:08:34 +0000
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- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
- Openpgp: preference=signencrypt
On 27/11/2019 10:04, Sergey Dyasli wrote:
> Currently if a user tries to live-load the same or older ucode revision
> than CPU already has, he will get a single message in Xen log like:
>
> (XEN) 128 cores are to update their microcode
>
> No actual ucode loading will happen and this situation can be quite
> confusing. Fix this by starting ucode update only when the provided
> ucode revision is higher than the currently cached one (if any).
> This is based on the property that if microcode_cache exists, all CPUs
> in the system should have at least that ucode revision.
>
> Additionally, print a user friendly message if no matching or newer
> ucode can be found in the provided blob. This also requires ignoring
> -ENODATA in AMD-side code, otherwise the message given to the user is:
>
> (XEN) Parsing microcode blob error -61
>
> Which actually means that a ucode blob was parsed fine, but no matching
> ucode was found.
>
> Signed-off-by: Sergey Dyasli <sergey.dyasli@xxxxxxxxxx>
> Reviewed-by: Chao Gao <chao.gao@xxxxxxxxx>
> Acked-by: Jan Beulich <jbeulich@xxxxxxxx>
Juergen,
Please consider this patch for 4.13. It greatly improves usability of
live ucode loading -- a new feature in this release.
--
Thanks,
Sergey
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