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authorJeremy Fitzhardinge <jeremy@xensource.com>2008-02-29 18:55:43 +0100
committerIngo Molnar <mingo@elte.hu>2008-02-29 18:55:43 +0100
commitd40e705903397445c6861a0a56c23e5b2e8f9b9a (patch)
treeb9a4a434fb482508f98dcf5f261deda1b6d1c610 /arch/x86/xen
parent53c58588107973c0e240a1ed4fb8295f274c409d (diff)
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>
Diffstat (limited to 'arch/x86/xen')
-rw-r--r--arch/x86/xen/enlighten.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c
index 49e5358f481..8b9ee27805f 100644
--- a/arch/x86/xen/enlighten.c
+++ b/arch/x86/xen/enlighten.c
@@ -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"