linux-kernel - Re: [PATCH v6 1/5] x86/tdx: Add TDX Guest attestation interface driver

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Message-ID: <YoKTDAeQPs5nQkg3@ovpn-116-50.gru2.redhat.com>
Date:   Mon, 16 May 2022 15:08:12 -0300
From:   Wander Lairson Costa <wander@...hat.com>
To:     Kuppuswamy Sathyanarayanan 
        <sathyanarayanan.kuppuswamy@...ux.intel.com>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org,
        "H . Peter Anvin" <hpa@...or.com>,
        "Kirill A . Shutemov" <kirill.shutemov@...ux.intel.com>,
        Tony Luck <tony.luck@...el.com>,
        Andi Kleen <ak@...ux.intel.com>,
        Kai Huang <kai.huang@...el.com>,
        Isaku Yamahata <isaku.yamahata@...il.com>,
        marcelo.cerri@...onical.com, tim.gardner@...onical.com,
        khalid.elmously@...onical.com, philip.cox@...onical.com,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v6 1/5] x86/tdx: Add TDX Guest attestation interface
 driver

On Thu, May 12, 2022 at 03:19:48PM -0700, Kuppuswamy Sathyanarayanan wrote:

[snip]

> +
> +static int __init tdx_attestation_init(void)
> +{
> +	long ret;
nit: the type of ret should be int
> +
> +	/* Make sure we are in a valid TDX platform */
> +	if (!cpu_feature_enabled(X86_FEATURE_TDX_GUEST))
> +		return -EIO;
> +
> +	miscdev.name = DRIVER_NAME;
> +	miscdev.minor = MISC_DYNAMIC_MINOR;
> +	miscdev.fops = &tdx_attest_fops;
> +
> +	ret = misc_register(&miscdev);
> +	if (ret) {
> +		pr_err("misc device registration failed\n");
> +		return ret;
> +	}
> +
> +	return 0;
> +}

[snip]