Re: [PATCH v4 2/3] x86/kexec/64: Error out if try to jump to old 4-level kernel from 5-level kernel

On 05/22/19 at 11:20am, Dave Young wrote: > How about the userspace kexec-tools? It needs a similar detection, but > I'm not sure how to detect paging mode, maybe some sysfs entry or > vmcoreinfo in /proc/vmcore In usersapce, I plan to parse /proc/kcore to get the starting address of page_offset

Re: [PATCH v4 2/3] x86/kexec/64: Error out if try to jump to old 4-level kernel from 5-level kernel

On 05/22/19 at 11:20am, Dave Young wrote: > On 05/09/19 at 09:36am, Baoquan He wrote: > > If the running kernel has 5-level paging activated, the 5-level paging > > mode is preserved across kexec. If the kexec'ed kernel does not contain > > support for handling active 5-level paging mode in the dec

Re: [PATCH v4 2/3] x86/kexec/64: Error out if try to jump to old 4-level kernel from 5-level kernel

On 05/09/19 at 09:36am, Baoquan He wrote: > If the running kernel has 5-level paging activated, the 5-level paging > mode is preserved across kexec. If the kexec'ed kernel does not contain > support for handling active 5-level paging mode in the decompressor, the > decompressor will crash with #GP.

Re: [PATCH v4 2/3] x86/kexec/64: Error out if try to jump to old 4-level kernel from 5-level kernel

On 05/09/19 at 09:36am, Baoquan He wrote: > If the running kernel has 5-level paging activated, the 5-level paging > mode is preserved across kexec. If the kexec'ed kernel does not contain > support for handling active 5-level paging mode in the decompressor, the > decompressor will crash with #GP.

[PATCH v4 2/3] x86/kexec/64: Error out if try to jump to old 4-level kernel from 5-level kernel

If the running kernel has 5-level paging activated, the 5-level paging mode is preserved across kexec. If the kexec'ed kernel does not contain support for handling active 5-level paging mode in the decompressor, the decompressor will crash with #GP. Prevent this situation at load time. If 5-level