linux-kernel - Re: [PATCH] KVM: nVMX: Remove stale comment from nested_vmx_load

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Message-ID: <dcee13f5-f447-9ab4-4803-e3c4f42fb011@oracle.com>
Date:   Tue, 4 Feb 2020 11:57:39 -0800
From:   Krish Sadhukhan <krish.sadhukhan@...cle.com>
To:     Sean Christopherson <sean.j.christopherson@...el.com>,
        Paolo Bonzini <pbonzini@...hat.com>
Cc:     Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Joerg Roedel <joro@...tes.org>, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] KVM: nVMX: Remove stale comment from
 nested_vmx_load_cr3()


On 2/4/20 7:32 AM, Sean Christopherson wrote:
> The blurb pertaining to the return value of nested_vmx_load_cr3() no
> longer matches reality, remove it entirely as the behavior it is
> attempting to document is quite obvious when reading the actual code.
>
> Signed-off-by: Sean Christopherson <sean.j.christopherson@...el.com>
> ---
>   arch/x86/kvm/vmx/nested.c | 2 --
>   1 file changed, 2 deletions(-)
>
> diff --git a/arch/x86/kvm/vmx/nested.c b/arch/x86/kvm/vmx/nested.c
> index 7608924ee8c1..0c9b847f7a25 100644
> --- a/arch/x86/kvm/vmx/nested.c
> +++ b/arch/x86/kvm/vmx/nested.c
> @@ -1076,8 +1076,6 @@ static bool nested_cr3_valid(struct kvm_vcpu *vcpu, unsigned long val)
>   /*
>    * Load guest's/host's cr3 at nested entry/exit. nested_ept is true if we are
>    * emulating VM entry into a guest with EPT enabled.
> - * Returns 0 on success, 1 on failure. Invalid state exit qualification code
> - * is assigned to entry_failure_code on failure.
>    */
>   static int nested_vmx_load_cr3(struct kvm_vcpu *vcpu, unsigned long cr3, bool nested_ept,
>   			       u32 *entry_failure_code)

I think it's worth keeping the last part which is " Exit qualification 
code is assigned to entry_failure_code on failure." because "Entry 
Failure" and "Exit Qualification" might sound bit confusing until you 
actually look at the caller nested_vmx_enter_non_root_mode().