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Date:   Wed, 29 May 2019 03:29:55 +0200
From:   Paolo Bonzini <>
To:     Tao Xu <>,,,,,,,
Subject: Re: [PATCH v2 2/3] KVM: vmx: Emulate MSR IA32_UMWAIT_CONTROL

On 24/05/19 09:56, Tao Xu wrote:
> +
> +	if (rdmsrl_safe(MSR_IA32_UMWAIT_CONTROL, &host_umwait_control))
> +		return;
> +

Does the host value ever change?  If not, this can perhaps be read once
when kvm_intel is loaded.  And if it changes often, it should be
shadowed into a percpu variable.


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