linux-kernel - Re: [PATCH v3 4/9] KVM: VMX: Configure runtime hooks using vmx_x86

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Date:   Mon, 23 Mar 2020 09:23:05 -0700
From:   Sean Christopherson <sean.j.christopherson@...el.com>
To:     Vitaly Kuznetsov <vkuznets@...hat.com>
Cc:     Paolo Bonzini <pbonzini@...hat.com>,
        Paul Mackerras <paulus@...abs.org>,
        Christian Borntraeger <borntraeger@...ibm.com>,
        Janosch Frank <frankja@...ux.ibm.com>,
        David Hildenbrand <david@...hat.com>,
        Cornelia Huck <cohuck@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Joerg Roedel <joro@...tes.org>, Marc Zyngier <maz@...nel.org>,
        James Morse <james.morse@....com>,
        Julien Thierry <julien.thierry.kdev@...il.com>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        linux-mips@...r.kernel.org, kvm@...r.kernel.org,
        kvm-ppc@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        kvmarm@...ts.cs.columbia.edu, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 4/9] KVM: VMX: Configure runtime hooks using
 vmx_x86_ops

On Mon, Mar 23, 2020 at 01:27:28PM +0100, Vitaly Kuznetsov wrote:
> Sean Christopherson <sean.j.christopherson@...el.com> writes:
> 
> > Configure VMX's runtime hooks by modifying vmx_x86_ops directly instead
> > of using the global kvm_x86_ops.  This sets the stage for waiting until
> > after ->hardware_setup() to set kvm_x86_ops with the vendor's
> > implementation.
> >
> > Signed-off-by: Sean Christopherson <sean.j.christopherson@...el.com>
> > ---
> >  arch/x86/kvm/vmx/nested.c | 15 ++++++++-------
> >  arch/x86/kvm/vmx/nested.h |  3 ++-
> >  arch/x86/kvm/vmx/vmx.c    | 27 ++++++++++++++-------------
> >  3 files changed, 24 insertions(+), 21 deletions(-)
> >
> > diff --git a/arch/x86/kvm/vmx/nested.c b/arch/x86/kvm/vmx/nested.c
> > index 4ff859c99946..87fea22c3799 100644
> > --- a/arch/x86/kvm/vmx/nested.c
> > +++ b/arch/x86/kvm/vmx/nested.c
> > @@ -6241,7 +6241,8 @@ void nested_vmx_hardware_unsetup(void)
> >  	}
> >  }
> >  
> > -__init int nested_vmx_hardware_setup(int (*exit_handlers[])(struct kvm_vcpu *))
> > +__init int nested_vmx_hardware_setup(struct kvm_x86_ops *ops,
> > +				     int (*exit_handlers[])(struct kvm_vcpu *))
> >  {
> >  	int i;
> >  
> > @@ -6277,12 +6278,12 @@ __init int nested_vmx_hardware_setup(int (*exit_handlers[])(struct kvm_vcpu *))
> >  	exit_handlers[EXIT_REASON_INVVPID]	= handle_invvpid;
> >  	exit_handlers[EXIT_REASON_VMFUNC]	= handle_vmfunc;
> >  
> > -	kvm_x86_ops->check_nested_events = vmx_check_nested_events;
> > -	kvm_x86_ops->get_nested_state = vmx_get_nested_state;
> > -	kvm_x86_ops->set_nested_state = vmx_set_nested_state;
> > -	kvm_x86_ops->get_vmcs12_pages = nested_get_vmcs12_pages;
> > -	kvm_x86_ops->nested_enable_evmcs = nested_enable_evmcs;
> > -	kvm_x86_ops->nested_get_evmcs_version = nested_get_evmcs_version;
> > +	ops->check_nested_events = vmx_check_nested_events;
> > +	ops->get_nested_state = vmx_get_nested_state;
> > +	ops->set_nested_state = vmx_set_nested_state;
> > +	ops->get_vmcs12_pages = nested_get_vmcs12_pages;
> > +	ops->nested_enable_evmcs = nested_enable_evmcs;
> > +	ops->nested_get_evmcs_version = nested_get_evmcs_version;
> 
> 
> A lazy guy like me would appreciate 'ops' -> 'vmx_x86_ops' rename as it
> would make 'git grep vmx_x86_ops' output more complete.

Ah, didn't think about that, obviously.