Re: [PATCH] x86/kvm: Account for fpstate->user_xfeatures changes

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On Thu, Sep 14, 2023 at 10:05:57AM -0700, Dongli Zhang wrote:
> That is:
> 
> 1. Without the commit (src and dst), something bad may happen.
> 
> 2. With the commit on src, issue is fixed.
> 
> 3. With the commit only dst, it is expected that issue is not fixed.
> 
> Therefore, from administrator's perspective, the bugfix should always be applied
> no the source server, in order to succeed the migration.

I fully agree. Though, I think this boils down to:
The commit must be on the source or something bad may happen.

It then follows that you cannot live-migrate guests off the source to patch it
without potentially corrupting the guests currently running on that source...

Regards,
Tyler



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