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

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Date:   Tue, 04 Feb 2020 17:15:44 +0100
From:   Vitaly Kuznetsov <vkuznets@...hat.com>
To:     Sean Christopherson <sean.j.christopherson@...el.com>
Cc:     Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Joerg Roedel <joro@...tes.org>, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org, Paolo Bonzini <pbonzini@...hat.com>
Subject: Re: [PATCH] KVM: nVMX: Remove stale comment from nested_vmx_load_cr3()

Sean Christopherson <sean.j.christopherson@...el.com> writes:

> 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.

"And if it doesn't seem that obvious just try staring at it for a few
years, do some small (60-70 patches) refactorings and fix several dozens
of bugs. It will." :-)

>
> 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)

Reviewed-by: Vitaly Kuznetsov <vkuznets@...hat.com>

-- 
Vitaly