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Re: [PATCH] x86/ucode: Remove MICROCODE_UPDATE_TIMEOUT and associated panic()
- To: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Wed, 19 Aug 2026 16:53:41 +0200
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- Cc: Roger Pau Monné <roger@xxxxxxxxxxxxxx>, Teddy Astie <teddy.astie@xxxxxxxxxx>, Xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- Delivery-date: Wed, 19 Aug 2026 14:53:48 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 19.08.2026 16:04, Andrew Cooper wrote:
> One other idea I had:
>
> If we rearrange the loop to have a periodic "taken $X seconds" (shows
> liveness), and maybe at 40s decide to panic (by passing through the out:
> label first so we release the APs, so they can crash more cleanly), then
> that might be acceptable.
>
> By 40s, the system isn't surviving even if the cores do all come back.
Maybe, yet I'm curious: How did you land at 40s as the "magic" boundary?
For a runtime load, even the 4.5s that you say GNR takes may already be
too much for the system (Dom0 and/or DomU-s) to properly survive as a
whole, depending on their requirements and/or configuration. Even our
time calibration rendezvous wants to occur once a second (albeit it may
not really need to run that often, plus iirc you have been saying that
we should get rid of it altogether).
Jan
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