[Qemu-devel] [PATCH v6 09/16] target-i386: Use Hypervisor vendor in -machine pc, accel=kvm.

[Don Slutz <Don@CloudSwitch.com>]

Also known as Paravirtualization vendor.

This change is based on:

Microsoft Hypervisor CPUID Leaves:
  http://msdn.microsoft.com/en-us/library/windows/hardware/ff542428%28v=vs.85%29.aspx

Linux kernel change starts with:
  http://fixunix.com/kernel/538707-use-cpuid-communicate-hypervisor.html
Also:
  http://lkml.indiana.edu/hypermail/linux/kernel/1205.0/00100.html

VMware documention on CPUIDs (Mechanisms to determine if software is
running in a VMware virtual machine):
  http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=1009458

Signed-off-by: Don Slutz <Don@CloudSwitch.com>
---
 target-i386/kvm.c |   12 +++++++-----
 1 files changed, 7 insertions(+), 5 deletions(-)

diff --git a/target-i386/kvm.c b/target-i386/kvm.c
index 8462c75..f8a5177 100644
--- a/target-i386/kvm.c
+++ b/target-i386/kvm.c
@@ -389,16 +389,18 @@ int kvm_arch_init_vcpu(CPUX86State *env)
     c = &cpuid_data.entries[cpuid_i++];
     memset(c, 0, sizeof(*c));
     c->function = KVM_CPUID_SIGNATURE;
-    if (!env->cpuid_hv_level_set) {
+    if (!env->cpuid_hv_level_set && !env->cpuid_hv_vendor_set) {
         memcpy(signature, "KVMKVMKVM\0\0\0", 12);
         c->eax = 0;
+        c->ebx = signature[0];
+        c->ecx = signature[1];
+        c->edx = signature[2];
     } else {
-        memcpy(signature, "Microsoft Hv", 12);
         c->eax = env->cpuid_hv_level;
+        c->ebx = env->cpuid_hv_vendor1;
+        c->ecx = env->cpuid_hv_vendor2;
+        c->edx = env->cpuid_hv_vendor3;
     }
-    c->ebx = signature[0];
-    c->ecx = signature[1];
-    c->edx = signature[2];
 
     c = &cpuid_data.entries[cpuid_i++];
     memset(c, 0, sizeof(*c));
-- 
1.7.1