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([2a09:80c0:192:0:5dac:bf3d:c41:c3e7]) by smtp.gmail.com with ESMTPSA id f21-20020a1c6a15000000b003fc02218d6csm4657610wmc.25.2023.08.10.04.18.56 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 10 Aug 2023 04:18:57 -0700 (PDT) Message-ID: <41f42c91-bcbe-cba6-c987-ae34d0879a9d@redhat.com> Date: Thu, 10 Aug 2023 13:18:56 +0200 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.13.0 Subject: Re: CXL volatile memory is not listed Content-Language: en-US To: =?UTF-8?Q?Philippe_Mathieu-Daud=c3=a9?= , Maverickk 78 , Igor Mammedov Cc: QEMU Developers , Jonathan Cameron References: From: David Hildenbrand Organization: Red Hat In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit Received-SPF: pass client-ip=170.10.129.124; envelope-from=david@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -42 X-Spam_score: -4.3 X-Spam_bar: ---- X-Spam_report: (-4.3 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, NICE_REPLY_A=-2.156, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=0.001, 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: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org On 10.08.23 12:59, Philippe Mathieu-Daudé wrote: > Hi, > > Cc'ing Igor and David. > > On 9/8/23 00:51, Maverickk 78 wrote: >> Hello, >> >> I am running qemu-system-x86_64 >> >> qemu-system-x86_64 --version >> QEMU emulator version 8.0.92 (v8.1.0-rc2-80-g0450cf0897) >> >> qemu-system-x86_64 \ >> -m 2G,slots=4,maxmem=4G \ >> -smp 4 \ >> -machine type=q35,accel=kvm,cxl=on \ >> -enable-kvm \ >> -nographic \ >> -device pxb-cxl,id=cxl.0,bus=pcie.0,bus_nr=52 \ >> -device cxl-rp,id=rp0,bus=cxl.0,chassis=0,port=0,slot=0 \ >> -object memory-backend-file,id=mem0,mem-path=/tmp/mem0,size=1G,share=true \ >> -device cxl-type3,bus=rp0,volatile-memdev=mem0,id=cxl-mem0 \ >> -M cxl-fmw.0.targets.0=cxl.0,cxl-fmw.0.size=1G >> >> >> I was expecting the CXL memory to be listed in "System Ram", the lsmem >> shows only 2G memory which is System RAM, it's not listing the CXL >> memory. We are talking about the memory via inside the guest, right? In the guest, that memory most probably has to be added as "System RAM" explicitly using the dax/kmem driver. https://lwn.net/Articles/922944/ Contains some details on how to use "daxctl reconfigure-device". -- Cheers, David / dhildenb