linux-kernel - Re: system time goes weird in kvm guest after host suspend/resume

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Message-ID: <87367a91rn.fsf@nanos.tec.linutronix.de>
Date:   Thu, 04 Jun 2020 19:30:52 +0200
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Miklos Szeredi <miklos@...redi.hu>
Cc:     kvm@...r.kernel.org, Paolo Bonzini <pbonzini@...hat.com>,
        Vincenzo Frascino <vincenzo.frascino@....com>,
        Juergen Gross <jgross@...e.com>, linux-kernel@...r.kernel.org
Subject: Re: system time goes weird in kvm guest after host suspend/resume

Miklos,

Thomas Gleixner <tglx@...utronix.de> writes:
>> Of course this does not reproduce here. What kind of host is this
>> running on? Can you provide a full demsg of the host please from boot to
>> post resume?
>
> Plus /proc/cpuinfo please (one CPU is sufficient)

thanks for providing the data. Unfortunately not really helpful. The
host has a non-stop TSC and the dmesg does not contain anything which
sheds light on this.

I grabbed a similar machine, installed a guest with 5.7 kernel and I'm
still unable to reproduce. No idea yet how to get down to the real root
cause of this.

Thanks,

        tglx