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[59.100.211.22]) by smtp.gmail.com with ESMTPSA id c22sm46367427pfo.50.2020.01.03.15.14.06 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 03 Jan 2020 15:14:10 -0800 (PST) Subject: Re: [PATCH v3 3/4] RISC-V: support vector extension csr To: LIU Zhiwei , alistair23@gmail.com, chihmin.chao@sifive.com, palmer@dabbelt.com References: <20200103033347.20909-1-zhiwei_liu@c-sky.com> <20200103033347.20909-4-zhiwei_liu@c-sky.com> From: Richard Henderson Message-ID: <87e202c0-9956-351d-8504-932b4b0aef55@linaro.org> Date: Sat, 4 Jan 2020 10:14:03 +1100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.2.2 MIME-Version: 1.0 In-Reply-To: <20200103033347.20909-4-zhiwei_liu@c-sky.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit X-detected-operating-system: by eggs.gnu.org: Genre and OS details not recognized. X-Received-From: 2607:f8b0:4864:20::544 X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: wenmeng_zhang@c-sky.com, qemu-riscv@nongnu.org, qemu-devel@nongnu.org, wxy194768@alibaba-inc.com Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On 1/3/20 2:33 PM, LIU Zhiwei wrote: > Until v0.7.1 specification, vector status is still not defined for > mstatus. Using "until" imples that v0.7.1 *does* define the vector status. Better said as "The v0.7.1 specification does not define vector status within mstatus. A future revision will define the privileged portion of the vector status." Although lack of a privileged spec does suggest to me that perhaps we ought to support the vector extension only for CONFIG_USER_ONLY for now. r~