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envelope-from=gregory.price@memverge.com; helo=NAM12-DM6-obe.outbound.protection.outlook.com X-Spam_score_int: -10 X-Spam_score: -1.1 X-Spam_bar: - X-Spam_report: (-1.1 / 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, FORGED_SPF_HELO=1, SPF_HELO_PASS=-0.001, SPF_NONE=0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=no autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+alex.bennee=linaro.org@nongnu.org Sender: qemu-devel-bounces+alex.bennee=linaro.org@nongnu.org X-TUID: 95IX8BrBoFfr On Fri, Jun 16, 2023 at 03:43:31PM +0800, Yuquan Wang wrote: > Hi, Gregory > > There is one confusion about CXL in QEMU I hope to consult. > If you have some time to look at this email, I would have better understanding of CXL > emulation in QEMU. > > On docs/system/devices/cxl.rst , Gregory wrote: > A very simple setup with just one directly attached CXL Type 3 Volatile Memory device:: > qemu-system-aarch64 -M virt,gic-version=3,cxl=on -m 4g,maxmem=8G,slots=8 -cpu max \ > ...... > > As the current master branch of QEMU has not yet complemented the CXL option/expansion > in arm virt machine, how this example command lines worked? Or here used another branch > rather than master? > > Many thanks > Yuquan As of today, the qemu/qemu.git master branch does have the required patch for volatile region support: adacc814f541af9281c922e750d8ba4b90c1a73e however, the last time i tested it on x86, the master branch was incapable of enabling these regions with the latest kernel (6.3.x) despite that kernel having sufficient support to do so. I have not dug into what the discrepency between master and johnathan's working branch are just yet. Last I tested cxl-2023-05-25 branch of Johnathan's fork is working on x86: https://gitlab.com/jic23/qemu/-/tree/cxl-2023-05-25 I have not worked with the ARM machine, but Johnathan may be able to comment on the state of ARM support for this code. ~Gregory