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Date:   Tue, 8 Oct 2019 08:39:24 -0700
From:   Christoph Hellwig <hch@infradead.org>
To:     Anup Patel <anup@brainfault.org>
Cc:     Christoph Hellwig <hch@infradead.org>,
        Albert Ou <aou@eecs.berkeley.edu>,
        Alan Kao <alankao@andestech.com>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Palmer Dabbelt <palmer@sifive.com>,
        "linux-kernel@vger.kernel.org List" <linux-kernel@vger.kernel.org>,
        Mike Rapoport <rppt@linux.ibm.com>,
        Atish Patra <atish.patra@wdc.com>, Gary Guo <gary@garyguo.net>,
        Paul Walmsley <paul.walmsley@sifive.com>,
        linux-riscv <linux-riscv@lists.infradead.org>,
        Thomas Gleixner <tglx@linutronix.de>,
        Allison Randal <allison@lohutok.net>
Subject: Re: [PATCH v2 3/3] RISC-V: Move SBI related macros under uapi.
Message-ID: <20191008153924.GA20318@infradead.org>
References: <20190927000915.31781-1-atish.patra@wdc.com>
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 <20190927222107.GC4700@infradead.org>
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On Thu, Oct 03, 2019 at 11:00:05AM +0530, Anup Patel wrote:
> These defines are indeed part of KVM userspace API because we will
> be forwarding SBI calls not handled by KVM RISC-V kernel module to
> KVM userspace (QEMU/KVMTOOL). The forwarded SBI call details
> are passed to userspace via "struct kvm_run" of KVM_RUN ioctl.

At best your are passing through a hardware interface.  We don't expose
e.g. the nvme headers to userspace either.  We keep the headers clean
enough that userspace can copy them (and a few projects do), but they
really are not a kernel interface in any classic way.