linux-kernel - Re: [PATCH v3 2/3] KVM: add converters between pfn_t and kvm_pfn

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Message-ID: <CAPcyv4iPLU5apAsMq2gqh-8hsWdGdkYodirnr5dwaRJ_qEP-SA@mail.gmail.com>
Date:   Thu, 2 Nov 2017 19:25:14 -0700
From:   Dan Williams <dan.j.williams@...el.com>
To:     Haozhong Zhang <haozhong.zhang@...el.com>
Cc:     KVM list <kvm@...r.kernel.org>, X86 ML <x86@...nel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Paolo Bonzini <pbonzini@...hat.com>, rkrcmar@...hat.com,
        Xiao Guangrong <xiaoguangrong.eric@...il.com>,
        "Cuevas Escareno, Ivan D" <ivan.d.cuevas.escareno@...el.com>,
        "Kumar, Karthik" <karthik.kumar@...el.com>,
        Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
        Olif Chapman <olif.chapman@...cle.com>
Subject: Re: [PATCH v3 2/3] KVM: add converters between pfn_t and kvm_pfn_t

On Thu, Nov 2, 2017 at 6:16 PM, Haozhong Zhang <haozhong.zhang@...el.com> wrote:
> Signed-off-by: Haozhong Zhang <haozhong.zhang@...el.com>
> ---
>  include/linux/kvm_host.h | 3 +++
>  1 file changed, 3 insertions(+)
>
> diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
> index 6882538eda32..759fe498c89e 100644
> --- a/include/linux/kvm_host.h
> +++ b/include/linux/kvm_host.h
> @@ -67,6 +67,9 @@
>  #define KVM_PFN_ERR_HWPOISON   (KVM_PFN_ERR_MASK + 1)
>  #define KVM_PFN_ERR_RO_FAULT   (KVM_PFN_ERR_MASK + 2)
>
> +#define kvm_pfn_to_pfn(x) ((pfn_t){ .val = (x)})
> +#define pfn_to_kvm_pfn(x) ((kvm_pfn_t)((x).val))

Shouldn't this mask off the kvm_pfn_t and  pfn_t specific bits when
converting between the two?