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The Linux kernel configuration item CONFIG_PROC_VMCORE_DEVICE_RAM
:
( CONFIG_PROC_VMCORE && CONFIG_NEED_PROC_VMCORE_DEVICE_RAM ) && ( CONFIG_VIRTIO_MEM )
If the elfcore hdr is allocated and prepared by the dump kernel ("2nd kernel") instead of the crashed kernel, RAM provided by memory devices such as virtio-mem will not be included in the dump image, because only the device driver can properly detect them.
With this config enabled, these RAM ranges will be queried from the device drivers once the device gets probed, so they can be included in the crash dump.
Relevant architectures should select NEED_PROC_VMCORE_DEVICE_RAM.
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