This in particular eliminates the need to specify "noapic" to Dom0 when
"noapic" is passed to Xen, provided the kernel side gets slightly
modified to make use of this information (Linux side patch cannot
easily be provided for the 2.6.18 tree, but this is being used by our
2.6.27-based one).
Signed-off-by: Jan Beulich <jbeulich@xxxxxxxxxx>
--- 2009年01月08日.orig/xen/arch/x86/traps.c 2009年01月08日 10:56:55.000000000 
+0100
+++ 2009年01月08日/xen/arch/x86/traps.c 2009年01月09日 09:42:42.000000000 +0100
@@ -723,6 +723,8 @@ static void pv_cpuid(struct cpu_user_reg
 {
 /* Modify Feature Information. */
 __clear_bit(X86_FEATURE_VME, &d);
+ if ( !cpu_has_apic )
+ __clear_bit(X86_FEATURE_APIC, &d);
 if ( !opt_allow_hugepage )
 __clear_bit(X86_FEATURE_PSE, &d);
 __clear_bit(X86_FEATURE_PGE, &d);
@@ -755,6 +757,8 @@ static void pv_cpuid(struct cpu_user_reg
 __clear_bit(X86_FEATURE_XTPR % 32, &c);
 __clear_bit(X86_FEATURE_PDCM % 32, &c);
 __clear_bit(X86_FEATURE_DCA % 32, &c);
+ if ( !cpu_has_apic )
+ __clear_bit(X86_FEATURE_X2APIC % 32, &c);
 __set_bit(X86_FEATURE_HYPERVISOR % 32, &c);
 break;
 case 0x80000001:
@@ -773,6 +777,8 @@ static void pv_cpuid(struct cpu_user_reg
 __clear_bit(X86_FEATURE_RDTSCP % 32, &d);
 
 __clear_bit(X86_FEATURE_SVME % 32, &c);
+ if ( !cpu_has_apic )
+ __clear_bit(X86_FEATURE_EXTAPICSPACE % 32, &c);
 __clear_bit(X86_FEATURE_OSVW % 32, &c);
 __clear_bit(X86_FEATURE_IBS % 32, &c);
 __clear_bit(X86_FEATURE_SKINIT % 32, &c);
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