Messages in this thread | | | Subject | Re: [PATCH v2 1/3] KVM: x86: implement KVM_{GET|SET}_TSC_STATE | From | Paolo Bonzini <> | Date | Thu, 10 Dec 2020 13:22:02 +0100 |
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On 10/12/20 13:14, Peter Zijlstra wrote: > On Thu, Dec 10, 2020 at 12:42:36PM +0100, Paolo Bonzini wrote: >> On 07/12/20 18:41, Thomas Gleixner wrote: >>> Right this happens still occasionally, but for quite some time this is >>> 100% firmware sillyness and not a fundamental property of the hardware >>> anymore. >> >> It's still a fundamental property of old hardware. Last time I tried to >> kill support for processors earlier than Core 2, I had to revert it. That's >> older than Nehalem. > > Core2 doesn't use TSC for timekeeping anyway. KVM shouldn't either.
On Core2, KVM guests pass TSC through kvmclock in order to get something usable and not incredibly slow.
Paolo
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