[Qemu-devel] [PATCH v7 16/17] target-i386: Use Hypervisor vendor in -machine pc, accel=tcg.

[Don Slutz]

Part of "target-i386: Add way to expose VMWare CPUID"

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
This is where the 0 is the same as 0x40000001 is defined.

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 <address@hidden>
---
 target-i386/cpu.c |   11 ++++++-----
 1 files changed, 6 insertions(+), 5 deletions(-)

diff --git a/target-i386/cpu.c b/target-i386/cpu.c
index 5b33b95..49e5db3 100644
--- a/target-i386/cpu.c
+++ b/target-i386/cpu.c
@@ -1769,8 +1769,9 @@ void cpu_x86_cpuid(CPUX86State *env, uint32_t index, 
uint32_t count,
         }
     } else if (index & 0x40000000) {
         /* test if maximum index reached
-         * but only if Hypervisor level is set */
-        if (env->cpuid_hv_level_set) {
+         * but only if Hypervisor level is set or
+         * if Hypervisor vendor is set */
+        if (env->cpuid_hv_level_set || env->cpuid_hv_vendor_set) {
             uint32_t real_level = env->cpuid_hv_level;
 
             /* Handle Hypervisor CPUIDs.
@@ -1925,9 +1926,9 @@ void cpu_x86_cpuid(CPUX86State *env, uint32_t index, 
uint32_t count,
         break;
     case 0x40000000:
         *eax = env->cpuid_hv_level;
-        *ebx = 0;
-        *ecx = 0;
-        *edx = 0;
+        *ebx = env->cpuid_hv_vendor1;
+        *ecx = env->cpuid_hv_vendor2;
+        *edx = env->cpuid_hv_vendor3;
         break;
     case 0x40000001:
         *eax = env->cpuid_kvm_features;
-- 
1.7.1