commit cf0a0d639cb8feee43f455bdb31454742337225d
Author: Jeremy Fitzhardinge <[EMAIL PROTECTED]>
Date: Fri Feb 29 18:55:43 2008 +0100
xen: mask out SEP from CPUID
upstream commit: d40e705903397445c6861a0a56c23e5b2e8f9b9a
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 <[EMAIL PROTECTED]>
Signed-off-by: Ingo Molnar <[EMAIL PROTECTED]>
Signed-off-by: Chris Wright <[EMAIL PROTECTED]>
diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c
index b6af3ea..228f6c7 100644
--- a/arch/x86/xen/enlighten.c
+++ b/arch/x86/xen/enlighten.c
@@ -153,6 +153,7 @@ static void xen_cpuid(unsigned int *eax, unsigned int *ebx,
if (*eax == 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"
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