linux-kernel - Re: [Resend RFC PATCH V2 04/12] HV: Add Write/Read MSR registers via ghcb

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Date:   Wed, 14 Apr 2021 17:41:41 +0200
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, tglx@...utronix.de, mingo@...hat.com,
        bp@...en8.de, x86@...nel.org, hpa@...or.com, arnd@...db.de,
        akpm@...ux-foundation.org, gregkh@...uxfoundation.org,
        konrad.wilk@...cle.com, hch@....de, m.szyprowski@...sung.com,
        robin.murphy@....com, joro@...tes.org, will@...nel.org,
        davem@...emloft.net, kuba@...nel.org, jejb@...ux.ibm.com,
        martin.petersen@...cle.com, Tianyu Lan <Tianyu.Lan@...rosoft.com>,
        iommu@...ts.linux-foundation.org, linux-arch@...r.kernel.org,
        linux-hyperv@...r.kernel.org, linux-kernel@...r.kernel.org,
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        thomas.lendacky@....com, brijesh.singh@....com,
        sunilmut@...rosoft.com
Subject: Re: [Resend RFC PATCH V2 04/12]  HV: Add Write/Read MSR registers
 via ghcb

> +EXPORT_SYMBOL_GPL(hv_ghcb_msr_write);

Just curious, who is going to use all these exports?  These seems like
extremely low-level functionality.  Isn't there a way to build a more
useful higher level API?