linux/arch/x86/xen
H. Peter Anvin 4763ed4d45 x86, mm: Clean up and simplify NX enablement
The 32- and 64-bit code used very different mechanisms for enabling
NX, but even the 32-bit code was enabling NX in head_32.S if it is
available.  Furthermore, we had a bewildering collection of tests for
the available of NX.

This patch:

a) merges the 32-bit set_nx() and the 64-bit check_efer() function
   into a single x86_configure_nx() function.  EFER control is left
   to the head code.

b) eliminates the nx_enabled variable entirely.  Things that need to
   test for NX enablement can verify __supported_pte_mask directly,
   and cpu_has_nx gives the supported status of NX.

Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Cc: Tejun Heo <tj@kernel.org>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Yinghai Lu <yinghai@kernel.org>
Cc: Pekka Enberg <penberg@cs.helsinki.fi>
Cc: Vegard Nossum <vegardno@ifi.uio.no>
Cc: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Cc: Chris Wright <chrisw@sous-sol.org>
LKML-Reference: <1258154897-6770-5-git-send-email-hpa@zytor.com>
Acked-by: Kees Cook <kees.cook@canonical.com>
2009-11-16 13:44:59 -08:00
..
Kconfig x86: remove the Voyager 32-bit subarch 2009-02-23 00:54:01 +01:00
Makefile xen: make -fstack-protector work under Xen 2009-09-09 16:37:39 -07:00
debugfs.c const: constify remaining file_operations 2009-10-01 16:11:11 -07:00
debugfs.h xen: add debugfs support 2008-08-21 13:52:58 +02:00
enlighten.c x86, mm: Clean up and simplify NX enablement 2009-11-16 13:44:59 -08:00
grant-table.c xen: make grant table arch portable 2008-04-24 23:57:32 +02:00
irq.c x86: Move irq_init to x86_init_ops 2009-08-31 09:35:45 +02:00
mmu.c cpumask: use mm_cpumask() wrapper: x86 2009-09-24 09:34:52 +09:30
mmu.h x86: Move paravirt pagetable_setup to x86_init_ops 2009-08-31 09:35:45 +02:00
multicalls.c x86, xen: do multicall callbacks with interrupts disabled 2009-02-16 08:56:41 +01:00
multicalls.h Merge commit 'v2.6.29-rc4' into core/percpu 2009-02-09 14:58:11 +01:00
setup.c xen: reserve Xen start_info rather than e820 reserving 2009-05-08 10:51:03 +02:00
smp.c xen: make -fstack-protector work under Xen 2009-09-09 16:37:39 -07:00
spinlock.c xen: use stronger barrier after unlocking lock 2009-09-09 16:38:44 -07:00
suspend.c x86, xen: fix hardirq.h merge fallout 2009-01-23 11:09:15 +01:00
time.c clocksource: pass clocksource to read() callback 2009-04-21 13:41:47 -07:00
vdso.h i386: move xen 2007-10-11 11:16:51 +02:00
xen-asm.S x86: style cleanups for xen assemblies 2009-02-05 20:25:41 +01:00
xen-asm.h xen: make direct versions of irq_enable/disable/save/restore to common code 2009-02-04 16:59:04 -08:00
xen-asm_32.S x86: style cleanups for xen assemblies 2009-02-05 20:25:41 +01:00
xen-asm_64.S x86: style cleanups for xen assemblies 2009-02-05 20:25:41 +01:00
xen-head.S x86: use _types.h headers in asm where available 2009-02-13 11:35:01 -08:00
xen-ops.h x86: Move xen_post_allocator_init into xen_pagetable_setup_done 2009-08-31 09:35:45 +02:00