[Qemu-devel] [PATCH 2/2] target-i386: Fix default Hypervisor level for hypervisor-vendor=kvm.

[Don Slutz <Don@CloudSwitch.com>]

>From http://lkml.indiana.edu/hypermail/linux/kernel/1205.0/00100.html
EAX should be KVM_CPUID_FEATURES (0x40000001) not 0.

If kvm is not configured, the additional option of hypervisor-level=1
(or hypervisor-level=0x40000001) needs to be specified to get this.
---
 target-i386/cpu.c |   12 +++++++++++-
 1 files changed, 11 insertions(+), 1 deletions(-)

diff --git a/target-i386/cpu.c b/target-i386/cpu.c
index 6e43eff..d73b0a8 100644
--- a/target-i386/cpu.c
+++ b/target-i386/cpu.c
@@ -1248,7 +1248,12 @@ static char *x86_cpuid_get_hv_vendor(Object *obj, Error **errp)
                env->cpuid_hv_level == CPUID_HV_LEVEL_XEN) {
         pstrcpy(value, sizeof(value), "xen");
     } else if (!strcmp(value, CPUID_HV_VENDOR_KVM) &&
-               env->cpuid_hv_level == 0) {
+#if defined(CONFIG_KVM)
+               env->cpuid_hv_level == KVM_CPUID_FEATURES
+#else
+               env->cpuid_hv_level == 0
+#endif
+	    ) {
         pstrcpy(value, sizeof(value), "kvm");
     }
     return value;
@@ -1281,6 +1286,11 @@ static void x86_cpuid_set_hv_vendor(Object *obj, const char *value,
         }
         pstrcpy(adj_value, sizeof(adj_value), CPUID_HV_VENDOR_XEN);
     } else if (!strcmp(value, "kvm")) {
+#if defined(CONFIG_KVM)
+        if (env->cpuid_hv_level == 0) {
+            env->cpuid_hv_level = KVM_CPUID_FEATURES;
+        }
+#endif
         pstrcpy(adj_value, sizeof(adj_value), CPUID_HV_VENDOR_KVM);
     } else {
         pstrcpy(adj_value, sizeof(adj_value), value);
-- 
1.7.1