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Re: [Qemu-devel] [PATCH 2/4] kvm: Allow invtsc migration if tsc-khz is s
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From: |
Marcelo Tosatti |
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Subject: |
Re: [Qemu-devel] [PATCH 2/4] kvm: Allow invtsc migration if tsc-khz is set explicitly |
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Date: |
Wed, 4 Jan 2017 09:57:40 -0200 |
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User-agent: |
Mutt/1.5.21 (2010-09-15) |
On Wed, Jan 04, 2017 at 09:44:06AM -0200, Marcelo Tosatti wrote:
> On Tue, Dec 27, 2016 at 05:21:18PM -0200, Eduardo Habkost wrote:
> > We can safely allow a VM to be migrated with invtsc enabled if
> > tsc-khz is set explicitly, because QEMU already refuses to start
> > if it can't set the TSC frequency to the configured value.
>
> On the source host, yes, but on the destination it does not.
>
> SOURCE: -cpu kvm64,tsc-frequency=2660001000
> DESTINATION: -cpu kvm64
>
> Only prints:
>
> qemu-system-x86_64: warning: TSC frequency mismatch between VM (2660001
> kHz) and host (2893428 kHz), and TSC scaling unavailable
> qemu-system-x86_64: warning: TSC frequency mismatch between VM (2660001
> kHz) and host (2893428 kHz), and TSC scaling unavailable
>
> And allows migration.
Ignore that comment, patch 4 deals with it.