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envelope-from=hca@linux.ibm.com; helo=mx0a-001b2d01.pphosted.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/07/15 05:27:14 X-ACL-Warn: Detected OS = Linux 3.x [generic] X-Spam_score_int: -35 X-Spam_score: -3.6 X-Spam_bar: --- X-Spam_report: (-3.6 / 5.0 requ) BAYES_00=-1.9, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H2=-1, 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: Thomas Huth , Janosch Frank , "Michael S . Tsirkin" , Cornelia Huck , qemu-devel@nongnu.org, Halil Pasic , Christian Borntraeger , qemu-s390x@nongnu.org, Claudio Imbrenda , Richard Henderson Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On Wed, Jul 15, 2020 at 11:19:03AM +0200, David Hildenbrand wrote: > On 14.07.20 12:17, Claudio Imbrenda wrote: > > shouldn't it return all the hotplugged areas once hotplugging is > > enabled? > > No, that would be dangerous and wrong. Memory ranges part of memory > devices never must be indicated as part of hw/firmware interfaces to > indicate valid boot memory. Memory provided via memory devices > (virtio-mem, virtio-pmem, ...) has different semantics than ordinary > hotplugged memory, and unmodified OSs (esp., older Linux versions) > should not silently try to make use of any such memory. It's not just > some hotplugged memory a guest OS should detect+use during boot as > system ram. Thanks! How is kdump supposed to work, if there is no mechanism to figure out which memory ranges have been added dynamically to the system?