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Date:   Fri, 11 Dec 2020 01:03:47 +0100
From:   Thomas Gleixner <>
To:     Andy Lutomirski <>
Cc:     Andy Lutomirski <>,
        Maxim Levitsky <>,
        Paolo Bonzini <>,
        Marcelo Tosatti <>,
        kvm list <>,
        "H. Peter Anvin" <>, Jonathan Corbet <>,
        Jim Mattson <>,
        Wanpeng Li <>,
        "open list\:KERNEL SELFTEST FRAMEWORK" 
        Vitaly Kuznetsov <>,
        Sean Christopherson <>,
        open list <>,
        Ingo Molnar <>,
        "maintainer\:X86 ARCHITECTURE \(32-BIT AND 64-BIT\)" <>,
        Joerg Roedel <>, Borislav Petkov <>,
        Shuah Khan <>,
        Andrew Jones <>,
        Oliver Upton <>,
        "open list\:DOCUMENTATION" <>
Subject: Re: [PATCH v2 1/3] KVM: x86: implement KVM_{GET|SET}_TSC_STATE

On Thu, Dec 10 2020 at 15:19, Andy Lutomirski wrote:
>> On Dec 10, 2020, at 2:28 PM, Thomas Gleixner <> wrote:
>> Can we please focus on real problems instead of making up new ones?
>> Correctness of time is a real problem despite the believe of virt folks
>> that it can be ignored or duct taped to death.
> I’m fine with this as long as it’s intentional. If we say “guest
> timekeeping across host suspend is correct because we notify the
> guest”, then we have a hole. But if we say “the host will try to
> notify the guest, and if the guest is out to lunch then the host
> reserves the right to suspend without waiting, and the guest should
> deal with this”, then okay.

Yes of course this would be intentional and documented behaviour, which
is an infinite improvement over the current situation.



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