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Re: [PATCH 2/3] x86/amd: Stop updating the Zenbleed mitigation dynamically
- To: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Wed, 26 Nov 2025 15:49:11 +0100
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- Cc: Roger Pau Monné <roger.pau@xxxxxxxxxx>, Xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- Delivery-date: Wed, 26 Nov 2025 14:49:32 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 26.11.2025 14:22, Andrew Cooper wrote:
> This was potentially helpful when the chickenbit was the only mitigation and
> microcode had not been released, but that was two years ago.
>
> Zenbleed microcode has been avaialble since December 2023, and the subsequent
> Entrysign signature vulnerability means that firmware updates block OS-loading
> and more OS-loadable microcode will be produced for Zen2.
>
> i.e. the Zenbleed fix is not going to appear at runtime these days.
>
> No practical change.
>
> Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
Acked-by: Jan Beulich <jbeulich@xxxxxxxx>
on the basis that people unwilling to update their firmware already accept
being vulnerable. To them this might be a perceived regression, i.e. not
exactly "No practical change", but we kind of accept that possibility.
Jan
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