linux-kernel - Re: [PATCHv3 2/2] kvm: x86: implement KVM PM-notifier

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Date:   Tue, 8 Jun 2021 09:44:51 +0900
From:   Sergey Senozhatsky <senozhatsky@...omium.org>
To:     Maxim Levitsky <mlevitsk@...hat.com>
Cc:     Sergey Senozhatsky <senozhatsky@...omium.org>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Marc Zyngier <maz@...nel.org>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Suleiman Souhlal <suleiman@...gle.com>, x86@...nel.org,
        kvm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCHv3 2/2] kvm: x86: implement KVM PM-notifier

On (21/06/07 15:54), Maxim Levitsky wrote:
> 
> Overall this looks OK to me.
>  
> Do you have a test case in which this patch helps to make the guest behave better after
> the host suspend though? I tested this and I don't see any significant change.
> (guest works after host suspend before and after, and I still have clocksource
> watchdogs firing in the guest)

Yes, we have automated suspend-resume tests. What happens for us is that,
when not properly paused, guests, upon host resume, discover jiffies spikes
and trigger all sort of watchdogs.