linux-kernel - Re: [PATCH 10/30] KVM: nSVM: extract preparation of VMCB for nested run

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Message-ID: <0f866ffb-625c-e577-bed2-c489aa42782c@redhat.com>
Date:   Fri, 29 May 2020 21:02:38 +0200
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Krish Sadhukhan <krish.sadhukhan@...cle.com>,
        linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Subject: Re: [PATCH 10/30] KVM: nSVM: extract preparation of VMCB for nested
 run

On 29/05/20 20:27, Krish Sadhukhan wrote:
>>
>> +static void nested_prepare_vmcb_save(struct vcpu_svm *svm, struct
>> vmcb *nested_vmcb)
> 
> 
> Not a big deal, but I feel that it helps a lot in readability if we keep
> the names symmetric. This one could be named prepare_nested_vmcb_save to
> match load_nested_vmcb_control that you created in the previous patch.
> Or load_nested_vmcb_control could be renamed to nested_load_vmcb_control
> to match the name here.

This is actually intended: while load_nested_vmcb_control loads the
members of nested_vmcb->control into svm->nested, the two functions in
this patch prepare the svm->vmcb.  A couple patches later,
nested_prepare_vmcb_control will not use nested_vmcb anymore.

I could use nested_load_nested_vmcb_control, but that is just too ugly!
 Instead, the best thing to do would be to use the vmcb01/vmcb02/vmcb12
names as in nVMX, in which case the functions would become
nested_load_vmcb12_control and nested_prepare_vmcb02_{save,control}.
However this is a bit hard to do right now because the svm->vmcb acts as
both vmcb01 and vmcb02 depending on what is running.

Thanks,

Paolo