linux-kernel - Re: [PATCH] KVM: X86: Make fpu allocation a common function

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Message-ID: <97255084-7b10-73a5-bfb4-fdc1d5cc0f6e@redhat.com>
Date:   Tue, 15 Oct 2019 16:27:21 +0200
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Vitaly Kuznetsov <vkuznets@...hat.com>,
        Sean Christopherson <sean.j.christopherson@...el.com>
Cc:     Xiaoyao Li <xiaoyao.li@...el.com>, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Radim Krčmář <rkrcmar@...hat.com>,
        Jim Mattson <jmattson@...gle.com>
Subject: Re: [PATCH] KVM: X86: Make fpu allocation a common function

On 15/10/19 12:53, Vitaly Kuznetsov wrote:
> A very theoretical question: why do we have 'struct vcpu' embedded in
> vcpu_vmx/vcpu_svm and not the other way around (e.g. in a union)? That
> would've allowed us to allocate memory in common code and then fill in
> vendor-specific details in .create_vcpu().

Probably "because it's always been like that" is the most accurate answer.

Paolo