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From:   Thomas Gleixner <tglx@linutronix.de>
To:     Miklos Szeredi <miklos@szeredi.hu>
Cc:     kvm@vger.kernel.org, Paolo Bonzini <pbonzini@redhat.com>,
        Vincenzo Frascino <vincenzo.frascino@arm.com>,
        Juergen Gross <jgross@suse.com>, linux-kernel@vger.kernel.org
Subject: Re: system time goes weird in kvm guest after host suspend/resume
In-Reply-To: <87sgfcf96k.fsf@nanos.tec.linutronix.de>
References: <CAJfpegstNYeseo_C4KOF9Y74qRxr78x2tK-9rTgmYM4CK30nRQ@mail.gmail.com> <875zcfoko9.fsf@nanos.tec.linutronix.de> <CAJfpegsjd+FJ0ZNHJ_qzJo0Dx22ZaWh-WZ48f94Z3AUXbJfYYQ@mail.gmail.com> <CAJfpegv0fNfHrkovSXCNq5Hk+yHP7usfMgr0qjPfwqiovKygDA@mail.gmail.com> <87r1v3lynm.fsf@nanos.tec.linutronix.de> <CAJfpegt6js2WK6SjSZHsz+fg7ZLU+AL6TzrsDYmRfp7vNrtXyw@mail.gmail.com> <CAJfpegtH7C0cu2iPv8gLq5_+=U3-XWZ3XRsP64h6Gbx-qqyZTQ@mail.gmail.com> <87sgfcf96k.fsf@nanos.tec.linutronix.de>
Date:   Wed, 03 Jun 2020 17:45:13 +0200
Message-ID: <87pnagf912.fsf@nanos.tec.linutronix.de>
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Thomas Gleixner <tglx@linutronix.de> writes:

> Miklos Szeredi <miklos@szeredi.hu> writes:
>> On Fri, May 29, 2020 at 2:31 PM Miklos Szeredi <miklos@szeredi.hu> wrote:
>>
>>> > Can you please describe the setup of this test?
>>> >
>>> >  - Host kernel version
>>
>> 5.5.16-100.fc30.x86_64
>>
>>> >  - Guest kernel version
>>
>> 75caf310d16c ("Merge branch 'akpm' (patches from Andrew)")
>>
>>> >  - Is the revert done on the host or guest or both?
>>
>> Guest.
>>
>>> >  - Test flow is:
>>> >
>>> >    Boot host, start guest, suspend host, resume host, guest is screwed
>>> >
>>> >    correct?
>>>
>>> Yep.
>
> 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)