linux-kernel - Re: [PATCH 00/17] KVM monolithic v1

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Date:   Mon, 23 Sep 2019 08:39:48 -0700
From:   Sean Christopherson <sean.j.christopherson@...el.com>
To:     Andrea Arcangeli <aarcange@...hat.com>
Cc:     Paolo Bonzini <pbonzini@...hat.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        "Dr. David Alan Gilbert" <dgilbert@...hat.com>,
        Marcelo Tosatti <mtosatti@...hat.com>,
        Peter Xu <peterx@...hat.com>, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 00/17] KVM monolithic v1

On Fri, Sep 20, 2019 at 05:24:52PM -0400, Andrea Arcangeli wrote:
> Andrea Arcangeli (17):
>   x86: spec_ctrl: fix SPEC_CTRL initialization after kexec
>   KVM: monolithic: x86: convert the kvm_x86_ops methods to external
>     functions
>   KVM: monolithic: x86: handle the request_immediate_exit variation
>   KVM: monolithic: x86: convert the kvm_pmu_ops methods to external
>     functions
>   KVM: monolithic: x86: enable the kvm_x86_ops external functions
>   KVM: monolithic: x86: enable the kvm_pmu_ops external functions
>   KVM: monolithic: x86: adjust the section prefixes
>   KVM: monolithic: adjust the section prefixes in the KVM common code
>   KVM: monolithic: x86: remove kvm.ko

IMO, the conversion to a monolithic module should occur immediately, i.e.
"KVM: monolithic: x86: remove kvm.ko" should be patch 01/nn.

Removing kvm_x86_ops and kvm_pmu_ops isn't a preqrequisite to making KVM
a monolothic module, rather they're enhancements that are made possible
*because* KVM is a monolithic module.

With that ordering, I suspect the convert->enable->use of kvm_x86_ops can
be collapsed into a single patch.

>   KVM: monolithic: x86: use the external functions instead of kvm_x86_ops
>   KVM: monolithic: x86: remove exports
>   KVM: monolithic: remove exports from KVM common code
>   KVM: monolithic: x86: drop the kvm_pmu_ops structure

>   KVM: monolithic: x86: inline more exit handlers in vmx.c
>   KVM: retpolines: x86: eliminate retpoline from vmx.c exit handlers
>   KVM: retpolines: x86: eliminate retpoline from svm.c exit handlers
>   x86: retpolines: eliminate retpoline from msr event handlers