netdev - Re: [PATCH V4 2/5] x86/hyper-v: Add hyperv Isolation VM check in the cc_platform

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Date:   Mon, 6 Dec 2021 15:06:51 +0100
From:   Christoph Hellwig <hch@....de>
To:     Tianyu Lan <ltykernel@...il.com>
Cc:     kys@...rosoft.com, haiyangz@...rosoft.com, sthemmin@...rosoft.com,
        wei.liu@...nel.org, decui@...rosoft.com, tglx@...utronix.de,
        mingo@...hat.com, bp@...en8.de, dave.hansen@...ux.intel.com,
        x86@...nel.org, hpa@...or.com, jgross@...e.com,
        sstabellini@...nel.org, boris.ostrovsky@...cle.com,
        joro@...tes.org, will@...nel.org, davem@...emloft.net,
        kuba@...nel.org, jejb@...ux.ibm.com, martin.petersen@...cle.com,
        arnd@...db.de, hch@...radead.org, m.szyprowski@...sung.com,
        robin.murphy@....com, thomas.lendacky@....com,
        Tianyu.Lan@...rosoft.com, xen-devel@...ts.xenproject.org,
        michael.h.kelley@...rosoft.com, iommu@...ts.linux-foundation.org,
        linux-arch@...r.kernel.org, linux-hyperv@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-scsi@...r.kernel.org,
        netdev@...r.kernel.org, vkuznets@...hat.com, brijesh.singh@....com,
        konrad.wilk@...cle.com, hch@....de, parri.andrea@...il.com,
        dave.hansen@...el.com
Subject: Re: [PATCH V4 2/5] x86/hyper-v: Add hyperv Isolation VM check in
 the cc_platform_has()

On Sun, Dec 05, 2021 at 03:18:10AM -0500, Tianyu Lan wrote:
> +static bool hyperv_cc_platform_has(enum cc_attr attr)
> +{
> +#ifdef CONFIG_HYPERV
> +	return attr == CC_ATTR_GUEST_MEM_ENCRYPT;
> +#else
> +	return false;
> +#endif
> +}

Can we even end up here without CONFIG_HYPERV?