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Date:   Thu, 21 May 2020 10:40:21 +0200
From:   Paolo Bonzini <>
To:     Tao Xu <>, Xiaoyao Li <>
Cc:     Maxim Levitsky <>,,
Subject: Re: [PATCH 2/2] kvm/x86: don't expose MSR_IA32_UMWAIT_CONTROL

On 21/05/20 08:44, Tao Xu wrote:
> I am sorry, I mean:
> By default, we don't expose WAITPKG to guest. For QEMU, we can use
> "-overcommit cpu-pm=on" to use WAITPKG.

But UMONITOR, UMWAIT and TPAUSE are not NOPs on older processors (which
I should have checked before committing your patch, I admit).  So you
have broken "-cpu host -overcommit cpu-pm=on" on any processor that
doesn't have WAITPKG.  I'll send a patch.


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