[PATCH 2/2] fill cpuid with clocksource information

[Glauber de Oliveira Costa <gcosta-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>]

In this patch, we probe the host checking for clocksource capabilities.
In case it is found, it is advertised to the guest through the appropriate
cpuid mechanism

Signed-off-by: Glauber de Oliveira Costa <gcosta-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
---
 qemu/qemu-kvm-x86.c |    6 +++++-
 1 files changed, 5 insertions(+), 1 deletions(-)

diff --git a/qemu/qemu-kvm-x86.c b/qemu/qemu-kvm-x86.c
index 21ec112..c008cb7 100644
--- a/qemu/qemu-kvm-x86.c
+++ b/qemu/qemu-kvm-x86.c
@@ -517,6 +517,10 @@ int kvm_arch_qemu_init_env(CPUState *cenv)
     int cpuid_nent = 0;
     CPUState copy;
     uint32_t i, limit;
+    int has_clocksource = 0;
+#ifdef KVM_CAP_CLOCKSOURCE
+    has_clocksource = kvm_check_extension(kvm_context, KVM_CAP_CLOCKSOURCE);
+#endif
 
     copy = *cenv;
 
@@ -534,7 +538,7 @@ int kvm_arch_qemu_init_env(CPUState *cenv)
     pv_ent = &cpuid_ent[cpuid_nent++];
     memset(pv_ent, 0, sizeof(*pv_ent));
     pv_ent->function = KVM_CPUID_FEATURES;
-    pv_ent->eax = 0;
+    pv_ent->eax = (has_clocksource << KVM_FEATURE_CLOCKSOURCE);
 #endif
 
     copy.regs[R_EAX] = 0;
-- 
1.5.0.6


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