diff options
| author | Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> | 2009-09-21 13:34:06 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2009-10-05 09:31:45 -0700 |
| commit | c22044b960eef0dfd48c9b608defaf2c5c3e7880 (patch) | |
| tree | 131cbf72d9b03a43d66836bf04528692f4b2a093 /arch | |
| parent | 7bb8fd4ee497a34c68e35d259a20d98cbad7fc94 (diff) | |
xen: check EFER for NX before setting up GDT mapping
commit b75fe4e5b869f8dbebd36df64a7fcda0c5b318ed upstream.
x86-64 assumes NX is available by default, so we need to
explicitly check for it before using NX. Some first-generation
Intel x86-64 processors didn't support NX, and even recent systems
allow it to be disabled in BIOS.
[ Impact: prevent Xen crash on NX-less 64-bit machines ]
Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/x86/mm/Makefile | 1 | ||||
| -rw-r--r-- | arch/x86/xen/enlighten.c | 10 |
2 files changed, 6 insertions, 5 deletions
diff --git a/arch/x86/mm/Makefile b/arch/x86/mm/Makefile index 72bb3a26c738..0088329b564b 100644 --- a/arch/x86/mm/Makefile +++ b/arch/x86/mm/Makefile @@ -4,6 +4,7 @@ obj-y := init.o init_$(BITS).o fault.o ioremap.o extable.o pageattr.o mmap.o \ # Make sure __phys_addr has no stackprotector nostackp := $(call cc-option, -fno-stack-protector) CFLAGS_ioremap.o := $(nostackp) +CFLAGS_init.o := $(nostackp) obj-$(CONFIG_SMP) += tlb.o diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c index 76143136dead..3839a0fd3f4c 100644 --- a/arch/x86/xen/enlighten.c +++ b/arch/x86/xen/enlighten.c @@ -1083,6 +1083,11 @@ asmlinkage void __init xen_start_kernel(void) __supported_pte_mask |= _PAGE_IOMAP; +#ifdef CONFIG_X86_64 + /* Work out if we support NX */ + check_efer(); +#endif + xen_setup_features(); /* Get mfn list */ @@ -1123,11 +1128,6 @@ asmlinkage void __init xen_start_kernel(void) pgd = (pgd_t *)xen_start_info->pt_base; -#ifdef CONFIG_X86_64 - /* Work out if we support NX */ - check_efer(); -#endif - /* Don't do the full vcpu_info placement stuff until we have a possible map and a non-dummy shared_info. */ per_cpu(xen_vcpu, 0) = &HYPERVISOR_shared_info->vcpu_info[0]; |