[Xen-devel] [PATCH RFC v1 40/74] xen/x86: report domain id on cpuid

[Wei Liu <wei.liu2@xxxxxxxxxx>]

From: Roger Pau Monne <roger.pau@xxxxxxxxxx>

Use the ebx register of the hypervisor leaf 1. The eax register on
this leaf is already used to report the Xen major and minor versions.

Signed-off-by: Roger Pau Monné <roger.pau@xxxxxxxxxx>
---
 xen/arch/x86/traps.c                | 1 +
 xen/include/public/arch-x86/cpuid.h | 3 ++-
 2 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/xen/arch/x86/traps.c b/xen/arch/x86/traps.c
index db16a44417..42c50b1cd4 100644
--- a/xen/arch/x86/traps.c
+++ b/xen/arch/x86/traps.c
@@ -853,6 +853,7 @@ void cpuid_hypervisor_leaves(const struct vcpu *v, uint32_t 
leaf,
 
     case 1:
         res->a = (xen_major_version() << 16) | xen_minor_version();
+        res->b = d->domain_id;
         break;
 
     case 2:
diff --git a/xen/include/public/arch-x86/cpuid.h 
b/xen/include/public/arch-x86/cpuid.h
index eb76875d0e..a17c8682a0 100644
--- a/xen/include/public/arch-x86/cpuid.h
+++ b/xen/include/public/arch-x86/cpuid.h
@@ -57,7 +57,8 @@
  * Leaf 2 (0x40000x01)
  * EAX[31:16]: Xen major version.
  * EAX[15: 0]: Xen minor version.
- * EBX-EDX: Reserved (currently all zeroes).
+ * EBX: Domain id.
+ * ECX-EDX: Reserved (currently all zeroes).
  */
 
 /*
-- 
2.11.0


_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxxxxxxxxx
https://lists.xenproject.org/mailman/listinfo/xen-devel