Hi Mohd, On 6/10/23 10:01 AM, Mohd Yusuf Abdul Hamid wrote:
I am trying to reserve a portion of the system memory in QEMU (arm64 virt), v7.2.1 - but the kernel never honors the reserved memory area and keeps using the area.Say, I dumped out DTB and added: reserved-memory { #address-cells = <0x02>; #size-cells = <0x02>; rsvdram@50000000 { no-map; reg = <0x00 0x50000000 0x00 0x20000000>; }; }; When booted, /proc/iomem still shows the kernel is using the entire space - eg 2GB. Is this a supported feature or I would need to modify the virt.c and define scratch area for some device driver scratch area.
It relies on the guest kernel to handle the device-tree and the device-tree node for the reserved map. I doubt if you had ACPI over device-tree in the guest kernel's configuration. In this case, the reserved memory regions need to be specified in ACPI tables instead of device-tree. Thanks, Gavin
