linux-kernel - Re: [PATCH 2/2] kvm/x86: don't expose MSR_IA32_UMWAIT

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Message-ID: <13f16f34-ce01-4207-1d1d-775b15a1e0f7@redhat.com>
Date:   Thu, 21 May 2020 10:24:22 +0200
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Xiaoyao Li <xiaoyao.li@...el.com>,
        Maxim Levitsky <mlevitsk@...hat.com>, kvm@...r.kernel.org,
        Tao Xu <tao3.xu@...el.com>
Cc:     linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] kvm/x86: don't expose MSR_IA32_UMWAIT_CONTROL
 unconditionally

On 21/05/20 06:33, Xiaoyao Li wrote:
> I remember there is certainly some reason why we don't expose WAITPKG to
> guest by default.

That's a userspace policy decision.  KVM_GET_SUPPORTED_CPUID should
still tell userspace that it's supported.

Paolo

> Tao, please help clarify it.