[Xen-changelog] [xen master] Viridian: populate CPUID leaf 6

[patchbot@xxxxxxx]

commit 551b3c1227318a442c1c8fc121e63d7d36d5dd12
Author:     Jan Beulich <jbeulich@xxxxxxxx>
AuthorDate: Wed Jul 17 08:49:08 2013 +0200
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Wed Jul 17 08:49:08 2013 +0200

    Viridian: populate CPUID leaf 6
    
    Properly reporting hardware features we use can only help Windows in
    making decisions towards its own performance tuning.
    
    Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
    Reviewed-by: Yang Zhang <yang.z.zhang@xxxxxxxxx>
    Reviewed-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
---
 xen/arch/x86/hvm/viridian.c |   14 ++++++++++++++
 1 files changed, 14 insertions(+), 0 deletions(-)

diff --git a/xen/arch/x86/hvm/viridian.c b/xen/arch/x86/hvm/viridian.c
index 46492cb..a20ed59 100644
--- a/xen/arch/x86/hvm/viridian.c
+++ b/xen/arch/x86/hvm/viridian.c
@@ -41,6 +41,11 @@
 #define CPUID4A_MSR_BASED_APIC  (1 << 3)
 #define CPUID4A_RELAX_TIMER_INT (1 << 5)
 
+/* Viridian CPUID 4000006, Implementation HW features detected and in use. */
+#define CPUID6A_APIC_OVERLAY    (1 << 0)
+#define CPUID6A_MSR_BITMAPS     (1 << 1)
+#define CPUID6A_NESTED_PAGING   (1 << 3)
+
 int cpuid_viridian_leaves(unsigned int leaf, unsigned int *eax,
                           unsigned int *ebx, unsigned int *ecx,
                           unsigned int *edx)
@@ -92,6 +97,15 @@ int cpuid_viridian_leaves(unsigned int leaf, unsigned int 
*eax,
             *eax |= CPUID4A_MSR_BASED_APIC;
         *ebx = 2047; /* long spin count */
         break;
+    case 6:
+        /* Detected and in use hardware features. */
+        if ( cpu_has_vmx_virtualize_apic_accesses )
+            *eax |= CPUID6A_APIC_OVERLAY;
+        if ( cpu_has_vmx_msr_bitmap || (read_efer() & EFER_SVME) )
+            *eax |= CPUID6A_MSR_BITMAPS;
+        if ( hap_enabled(d) )
+            *eax |= CPUID6A_NESTED_PAGING;
+        break;
     }
 
     return 1;
--
generated by git-patchbot for /home/xen/git/xen.git#master

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