[Crash-utility] Re: [PATCH 1/2] Add x86_64 linux-2.6.27 support: Catch up the PAGE_OFFSET change.

> I think that a new virtualization_init() function is a good idea. > > How about checking whether "Xen" exists in PT_NOTE section of an vmcore > at virtualization_init()? I feel that it is safer than reading a xen_start_info > pointer. > > $ readelf -n vmcore > Notes at offset 0x00000120 with length 0x00001388: > Owner Data size Description > CORE 0x00000150 NT_PRSTATUS (prstatus structure) > Xen 0x00000020 Unknown note type: (0x01000002) <----- HERE > CORE 0x00000150 NT_PRSTATUS (prstatus structure) > Xen 0x00000020 Unknown note type: (0x01000002) <----- HERE > Xen 0x00000050 Unknown note type: (0x01000001) <----- HERE > VMCOREINFO_XEN 0x00000fe4 Unknown note type: (0x00000000) > $ Well there may be a couple issues with that approach. First, we need a way to handle/recognize it on live systems. And second, I believe we'll need a way to differentiate a pv_ops/xen kernel from a "dedicated" xen kernel. And my guess is that the vmcore notes will not differentiate between the two "flavors" of xen kernel (unless there's an entry in the VMCOREINFO_XEN that will somehow differentiate the two).