[PATCH v2 11/12] viridian: add a new '_HVMPV_ex_processor_masks' bit into HVM_PARAM_VIRIDIAN...

[Paul Durrant <paul@xxxxxxx>]

From: Paul Durrant <pdurrant@xxxxxxxxxx>

... and advertise ExProcessorMasks support if it is set.

Support is advertised by setting bit 11 in CPUID:40000004:EAX.

Signed-off-by: Paul Durrant <pdurrant@xxxxxxxxxx>
---
Cc: Wei Liu <wl@xxxxxxx>
Cc: Jan Beulich <jbeulich@xxxxxxxx>
Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
Cc: "Roger Pau Monné" <roger.pau@xxxxxxxxxx>
Cc: George Dunlap <george.dunlap@xxxxxxxxxx>
Cc: Ian Jackson <iwj@xxxxxxxxxxxxxx>
Cc: Julien Grall <julien@xxxxxxx>
Cc: Stefano Stabellini <sstabellini@xxxxxxxxxx>
---
 xen/arch/x86/hvm/viridian/viridian.c | 3 +++
 xen/include/public/hvm/params.h      | 7 ++++++-
 2 files changed, 9 insertions(+), 1 deletion(-)

diff --git a/xen/arch/x86/hvm/viridian/viridian.c 
b/xen/arch/x86/hvm/viridian/viridian.c
index de3f5f86777c..54b20188e326 100644
--- a/xen/arch/x86/hvm/viridian/viridian.c
+++ b/xen/arch/x86/hvm/viridian/viridian.c
@@ -84,6 +84,7 @@ typedef union _HV_CRASH_CTL_REG_CONTENTS
 #define CPUID4A_MSR_BASED_APIC         (1 << 3)
 #define CPUID4A_RELAX_TIMER_INT        (1 << 5)
 #define CPUID4A_SYNTHETIC_CLUSTER_IPI  (1 << 10)
+#define CPUID4A_EX_PROCESSOR_MASKS     (1 << 11)
 
 /* Viridian CPUID leaf 6: Implementation HW features detected and in use */
 #define CPUID6A_APIC_OVERLAY    (1 << 0)
@@ -197,6 +198,8 @@ void cpuid_viridian_leaves(const struct vcpu *v, uint32_t 
leaf,
             res->a |= CPUID4A_MSR_BASED_APIC;
         if ( viridian_feature_mask(d) & HVMPV_hcall_ipi )
             res->a |= CPUID4A_SYNTHETIC_CLUSTER_IPI;
+        if ( viridian_feature_mask(d) & HVMPV_ex_processor_masks )
+            res->a |= CPUID4A_EX_PROCESSOR_MASKS;
 
         /*
          * This value is the recommended number of attempts to try to
diff --git a/xen/include/public/hvm/params.h b/xen/include/public/hvm/params.h
index 0e3fdca09646..3b0a0f45da53 100644
--- a/xen/include/public/hvm/params.h
+++ b/xen/include/public/hvm/params.h
@@ -164,6 +164,10 @@
 #define _HVMPV_hcall_ipi 9
 #define HVMPV_hcall_ipi (1 << _HVMPV_hcall_ipi)
 
+/* Enable ExProcessorMasks */
+#define _HVMPV_ex_processor_masks 10
+#define HVMPV_ex_processor_masks (1 << _HVMPV_ex_processor_masks)
+
 #define HVMPV_feature_mask \
         (HVMPV_base_freq | \
          HVMPV_no_freq | \
@@ -174,7 +178,8 @@
          HVMPV_crash_ctl | \
          HVMPV_synic | \
          HVMPV_stimer | \
-         HVMPV_hcall_ipi)
+         HVMPV_hcall_ipi | \
+         HVMPV_ex_processor_masks)
 
 #endif
 
-- 
2.20.1