Thread (77 messages) 77 messages, 9 authors, 2020-12-15

Re: [PATCH v2 1/3] KVM: x86: implement KVM_{GET|SET}_TSC_STATE

From: Thomas Gleixner <hidden>
Date: 2020-12-11 00:05:44
Also in: kvm, linux-kselftest, lkml

On Thu, Dec 10 2020 at 15:19, Andy Lutomirski wrote:
quoted
On Dec 10, 2020, at 2:28 PM, Thomas Gleixner [off-list ref] 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.

Thanks,

        tglx
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