linux-kernel - Re: [RFC PATCH v2 55/69] KVM: VMX: Add 'main.c' to wrap VMX and TDX

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Date:   Thu, 8 Jul 2021 08:21:52 -0700
From:   Isaku Yamahata <isaku.yamahata@...il.com>
To:     Paolo Bonzini <pbonzini@...hat.com>
Cc:     isaku.yamahata@...el.com, Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "H . Peter Anvin" <hpa@...or.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Joerg Roedel <joro@...tes.org>, erdemaktas@...gle.com,
        Connor Kuehl <ckuehl@...hat.com>,
        Sean Christopherson <seanjc@...gle.com>, x86@...nel.org,
        linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
        isaku.yamahata@...il.com,
        Sean Christopherson <sean.j.christopherson@...el.com>,
        kernel test robot <lkp@...el.com>,
        Xiaoyao Li <xiaoyao.li@...el.com>
Subject: Re: [RFC PATCH v2 55/69] KVM: VMX: Add 'main.c' to wrap VMX and TDX

On Tue, Jul 06, 2021 at 04:43:22PM +0200,
Paolo Bonzini <pbonzini@...hat.com> wrote:

> On 03/07/21 00:05, isaku.yamahata@...el.com wrote:
> > +#include "vmx.c"
> 
> What makes it particularly hard to have this as a separate .o file rather
> than an #include?

It's to let complier to optimize functionc call of "if (tdx) tdx_xxx() else vmx_xxx()",
given x86_ops static call story.
-- 
Isaku Yamahata <isaku.yamahata@...il.com>