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[174.21.84.25]) by smtp.gmail.com with ESMTPSA id 14sm22583471pfy.55.2021.03.02.17.41.05 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 02 Mar 2021 17:41:06 -0800 (PST) Subject: Re: [PATCH v2] target/s390x: Implement the MVPG condition-code-option bit From: Richard Henderson To: qemu-devel@nongnu.org References: <20210303013915.3122076-1-richard.henderson@linaro.org> Message-ID: <40cd0a20-a4d1-998b-b0d3-b195b8c60201@linaro.org> Date: Tue, 2 Mar 2021 17:41:04 -0800 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.7.1 MIME-Version: 1.0 In-Reply-To: <20210303013915.3122076-1-richard.henderson@linaro.org> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit Received-SPF: pass client-ip=2607:f8b0:4864:20::1032; envelope-from=richard.henderson@linaro.org; helo=mail-pj1-x1032.google.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, NICE_REPLY_A=-0.001, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action 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: qemu-s390x@nongnu.org, Thomas Huth , David Hildenbrand Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On 3/2/21 5:39 PM, Richard Henderson wrote: > If the CCO bit is set, MVPG should not generate an exception > but report page translation faults via a CC code. Create a new > helper, access_prepare_nf, which can use probe_access_flags in > non-faulting mode. > > Cc: David Hildenbrand > Reported-by: Thomas Huth > Signed-off-by: Richard Henderson > --- > target/s390x/mem_helper.c | 76 +++++++++++++++++++++++++++------------ > 1 file changed, 53 insertions(+), 23 deletions(-) Oh, I meant to say that this is untested, but is what I was talking about wrt performing only a single lookup per page. r~