x86/xen: use capabilities instead of fake cpuid values for x2apic

When running as pv domain xen_cpuid() is being used instead of native_cpuid(). In xen_cpuid() the x2apic feature is indicated as not being present by special casing the related cpuid leaf. Instead of delivering fake cpuid values clear the cpu capability bit for x2apic instead. Signed-off-by: Juergen Gross <[email protected]> Reviewed-by: Boris Ostrovsky <[email protected]> Signed-off-by: Juergen Gross <[email protected]>
jimmycarry · May 2, 2017 · e657fcc · e657fcc
1 parent ea01598
commit e657fcc
Showing 1 changed file with 1 addition and 2 deletions.
diff --git a/arch/x86/xen/enlighten_pv.c b/arch/x86/xen/enlighten_pv.c
@@ -286,8 +286,6 @@ static void __init xen_init_cpuid_mask(void)
 	unsigned int ax, bx, cx, dx;
 	unsigned int xsave_mask;
 
-	cpuid_leaf1_ecx_mask &= ~(1 << (X86_FEATURE_X2APIC % 32));
-
 	ax = 1;
 	cx = 0;
 	cpuid(1, &ax, &bx, &cx, &dx);
@@ -309,6 +307,7 @@ static void __init xen_init_capabilities(void)
 	setup_clear_cpu_cap(X86_FEATURE_APERFMPERF);
 	setup_clear_cpu_cap(X86_FEATURE_MTRR);
 	setup_clear_cpu_cap(X86_FEATURE_ACC);
+	setup_clear_cpu_cap(X86_FEATURE_X2APIC);
 
 	if (!xen_initial_domain())
 		setup_clear_cpu_cap(X86_FEATURE_ACPI);