Commit d40e7059 authored Feb 29, 2008 by Jeremy Fitzhardinge Committed by Ingo Molnar Feb 29, 2008

xen: mask out SEP from CPUID



Fix 32-on-64 pvops kernel:

we don't want userspace using syscall/sysenter, even if the hypervisor
supports it, so mask it out from CPUID.

Signed-off-by: Jeremy Fitzhardinge <jeremy@xensource.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

parent 53c58588

arch/x86/xen/enlighten.c

+1 −0

Original line number	Diff line number	Diff line
		@@ -153,6 +153,7 @@ static void xen_cpuid(unsigned int ax, unsigned int bx,
		if (*ax == 1)
		maskedx = ~((1 << X86_FEATURE_APIC) \| /* disable APIC */
		(1 << X86_FEATURE_ACPI) \| /* disable ACPI */
		(1 << X86_FEATURE_SEP) \| /* disable SEP */
		(1 << X86_FEATURE_ACC)); /* thermal monitoring */

		asm(XEN_EMULATE_PREFIX "cpuid"