linux-kernel - Re: [PATCH 00/61] KVM: x86: Introduce KVM cpu caps

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Message-ID: <67038178-623d-3e66-a0e4-f57610f2a5d5@redhat.com>
Date:   Fri, 28 Feb 2020 08:04:13 +0100
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Sean Christopherson <sean.j.christopherson@...el.com>
Cc:     Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Joerg Roedel <joro@...tes.org>, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 00/61] KVM: x86: Introduce KVM cpu caps

On 28/02/20 02:37, Sean Christopherson wrote:
>>> Would it be better or worse if we eliminate set_supported_cpuid() hook
>>> completely by doing an ugly hack like (completely untested):
>> Yes, it makes sense.
> Works for me, I'll tack it on.  I think my past self kept it because I was
> planning on using vmx_set_supported_cpuid() for SGX, which adds multiple
> sub-leafs, but I'm pretty sure I can squeeze them into kvm_cpu_caps with
> a few extra shenanigans.
> 

We can add it back for full CPUID leaves; it may even make sense to move
PT processing there (but not in this series).

Paolo