Re: [Crash-utility] What is the current state of the 5-level page tables in Crash

>> No, not really. I originally delayed further work because originally it >> was enabled by kernel CONFIG, but as I understand it now, it is enabled by >> a combination of a kernel CONFIG and a boot command line option? But > I am sorry I just found the CONFIG_X86_5LEVEL, Could you tell me the > name of boot command line option? I thought I had seen a patch posted on LKML that enabled the boot command line option, but according to the current Documentation/x86/x86_64/5level-paging.txt, it is still TBD: $ cat Documentation/x86/x86_64/5level-page.txt ... [ cut ] ... == Enabling 5-level paging == CONFIG_X86_5LEVEL=y enables the feature. So far, a kernel compiled with the option enabled will be able to boot only on machines that supports the feature -- see for 'la57' flag in /proc/cpuinfo. The plan is to implement boot-time switching between 4- and 5-level paging in the future.