On 04/04/18 16:27, Greg KH wrote: > On Wed, Apr 04, 2018 at 12:38:43PM +0200, Juergen Gross wrote: >> Please add the patches: >> >> commit 038bac2b02989acf1fc938cedcb7944c02672b9f upstream >> commit dfc9327ab7c99bc13e12106448615efba833886b upstream >> commit b17d9d1df3c33a4f1d2bf397e2257aecf9dc56d4 upstream >> >> to the 4.15 and 4.16 stable kernels. >> >> Those patches are needed to boot Linux as PVH guest on recent Xen. > > So a new feature? Why is that ok for stable kernels? It works for kernels since at least 4.11 on Xen 4.10. > >> In PVH mode there is no guarantee the kernel can find the RSDP table >> at the legacy location in low memory, which is a requirement for the >> kernel to boot successful without those patches. > > Why not just use newer kernels for new Xen features? This really > doesn't look like a bugfix to me, does it to you? It does. A working setup will no longer work if Xen version is upgraded to 4.11. Juergen