Messages in this thread | | | Date | Wed, 26 Jul 2017 19:43:35 +0300 | From | "Kirill A. Shutemov" <> | Subject | Re: [PATCHv2 08/10] x86/mm: Replace compile-time checks for 5-level with runtime-time |
| |
On Wed, Jul 26, 2017 at 09:28:16AM +0200, Juergen Gross wrote: > On 25/07/17 11:05, Kirill A. Shutemov wrote: > > On Tue, Jul 18, 2017 at 04:24:06PM +0200, Juergen Gross wrote: > >> Xen PV guests will never run with 5-level-paging enabled. So I guess you > >> can drop the complete if (IS_ENABLED(CONFIG_X86_5LEVEL)) {} block. > > > > There is more code to drop from mmu_pv.c. > > > > But while there, I thought if with boot-time 5-level paging switching we > > can allow kernel to compile with XEN_PV and XEN_PVH, so the kernel image > > can be used in these XEN modes with 4-level paging. > > > > Could you check if with the patch below we can boot in XEN_PV and XEN_PVH > > modes? > > We can't. I have used your branch: > > git://git.kernel.org/pub/scm/linux/kernel/git/kas/linux.git > la57/boot-switching/v2 > > with this patch applied on top. > > Doesn't boot PV guest with X86_5LEVEL configured (very early crash).
Hm. Okay.
Have you tried PVH?
> Doesn't build with X86_5LEVEL not configured: > > AS arch/x86/kernel/head_64.o
I've fixed the patch and split the patch into two parts: cleanup and re-enabling XEN_PV and XEN_PVH for X86_5LEVEL.
There's chance that I screw somthing up in clenaup part. Could you check that?
-- Kirill A. Shutemov
| |