I need to pass a custom e820 map to a virtual machine for troubleshooting purposes and working around IOMMU hardware bugs.
I have found references to a custom map being providable via an external file, mentioned as "etc/e820" and "fw_cfg". Unfortunately, I have not found any documentation that explains how to use this from userspace when invoking qemu. Can anybody point me in the right direction? What is the exact format of this e820 map file and how do I tell qemu to use it (and where to find it) when initializing the guest environment? Many thanks. Gordan
