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Commit bc6081ff authored by Jeremy Fitzhardinge's avatar Jeremy Fitzhardinge
Browse files

xen: set _PAGE_NX in __supported_pte_mask before pagetable construction 



Some 64-bit machines don't support the NX flag in ptes.
Check for NX before constructing the kernel pagetables.

Signed-off-by: default avatarJeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
parent 9a5a2cac

arch/x86/xen/enlighten.c

+6 −1
Original line number Diff line number Diff line
@@ -42,6 +42,7 @@ 
#include <asm/xen/hypervisor.h>

#include <asm/fixmap.h>

#include <asm/processor.h>

#include <asm/proto.h>

#include <asm/msr-index.h>

#include <asm/setup.h>

#include <asm/desc.h>
@@ -914,7 +915,6 @@ static const struct machine_ops __initdata xen_machine_ops = { 
	.emergency_restart = xen_emergency_restart,

};





/* First C function to be called on Xen boot */

asmlinkage void __init xen_start_kernel(void)

{
@@ -982,6 +982,11 @@ asmlinkage void __init xen_start_kernel(void) 
	if (!xen_initial_domain())

		__supported_pte_mask &= ~(_PAGE_PWT | _PAGE_PCD);



#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];