This is a note to let you know that I've just added the patch titled

x86/xen: Provide pre-built page tables only for CONFIG_XEN_PV=y and CONFIG_XEN_PVH=y

to the 4.14-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git%3Ba=su...

The filename of the patch is: x86-xen-provide-pre-built-page-tables-only-for-config_xen_pv-y-and-config_xen_pvh-y.patch and it can be found in the queue-4.14 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let stable@vger.kernel.org know about it.

From 4375c29985f155d7eb2346615d84e62d1b673682 Mon Sep 17 00:00:00 2001

From: "Kirill A. Shutemov" kirill.shutemov@linux.intel.com Date: Fri, 29 Sep 2017 17:08:19 +0300 Subject: x86/xen: Provide pre-built page tables only for CONFIG_XEN_PV=y and CONFIG_XEN_PVH=y

From: Kirill A. Shutemov kirill.shutemov@linux.intel.com

commit 4375c29985f155d7eb2346615d84e62d1b673682 upstream.

Looks like we only need pre-built page tables in the CONFIG_XEN_PV=y and CONFIG_XEN_PVH=y cases.

Let's not provide them for other configurations.

Signed-off-by: Kirill A. Shutemov kirill.shutemov@linux.intel.com Reviewed-by: Juergen Gross jgross@suse.com Cc: Andrew Morton akpm@linux-foundation.org Cc: Andy Lutomirski luto@amacapital.net Cc: Borislav Petkov bp@suse.de Cc: Cyrill Gorcunov gorcunov@openvz.org Cc: Linus Torvalds torvalds@linux-foundation.org Cc: Peter Zijlstra peterz@infradead.org Cc: Thomas Gleixner tglx@linutronix.de Cc: linux-mm@kvack.org Link: http://lkml.kernel.org/r/20170929140821.37654-5-kirill.shutemov@linux.intel.... Signed-off-by: Ingo Molnar mingo@kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org

--- arch/x86/kernel/head_64.S | 11 ++++++----- 1 file changed, 6 insertions(+), 5 deletions(-)

--- a/arch/x86/kernel/head_64.S +++ b/arch/x86/kernel/head_64.S @@ -38,11 +38,12 @@ * */

-#define p4d_index(x) (((x) >> P4D_SHIFT) & (PTRS_PER_P4D-1)) #define pud_index(x) (((x) >> PUD_SHIFT) & (PTRS_PER_PUD-1))

+#if defined(CONFIG_XEN_PV) || defined(CONFIG_XEN_PVH) PGD_PAGE_OFFSET = pgd_index(__PAGE_OFFSET_BASE) PGD_START_KERNEL = pgd_index(__START_KERNEL_map) +#endif L3_START_KERNEL = pud_index(__START_KERNEL_map)

.text @@ -365,10 +366,7 @@ NEXT_PAGE(early_dynamic_pgts)

.data

-#ifndef CONFIG_XEN -NEXT_PAGE(init_top_pgt) - .fill 512,8,0 -#else +#if defined(CONFIG_XEN_PV) || defined(CONFIG_XEN_PVH) NEXT_PAGE(init_top_pgt) .quad level3_ident_pgt - __START_KERNEL_map + _KERNPG_TABLE_NOENC .org init_top_pgt + PGD_PAGE_OFFSET*8, 0 @@ -385,6 +383,9 @@ NEXT_PAGE(level2_ident_pgt) * Don't set NX because code runs from these pages. */ PMDS(0, __PAGE_KERNEL_IDENT_LARGE_EXEC, PTRS_PER_PMD) +#else +NEXT_PAGE(init_top_pgt) + .fill 512,8,0 #endif

#ifdef CONFIG_X86_5LEVEL

Patches currently in stable-queue which might be from kirill.shutemov@linux.intel.com are

queue-4.14/x86-xen-provide-pre-built-page-tables-only-for-config_xen_pv-y-and-config_xen_pvh-y.patch queue-4.14/x86-xen-drop-5-level-paging-support-code-from-the-xen_pv-code.patch queue-4.14/x86-kasan-use-the-same-shadow-offset-for-4-and-5-level-paging.patch queue-4.14/mm-sparsemem-allocate-mem_section-at-runtime-for-config_sparsemem_extreme-y.patch queue-4.14/x86-mm-relocate-page-fault-error-codes-to-traps.h.patch