[Qemu-devel] [PATCH 2/2] qemu-x86: Set tsc_khz in kvm when supported

[Joerg Roedel <joerg.roedel@amd.com>]

Make use of the KVM_TSC_CONTROL feature if available.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
---
 target-i386/kvm.c |   11 +++++++++++
 1 files changed, 11 insertions(+), 0 deletions(-)

diff --git a/target-i386/kvm.c b/target-i386/kvm.c
index 1ae2d61..2d89544 100644
--- a/target-i386/kvm.c
+++ b/target-i386/kvm.c
@@ -528,6 +528,17 @@ int kvm_arch_init_vcpu(CPUState *env)
     }
 #endif
 
+#ifdef KVM_CAP_TSC_CONTROL
+    r = kvm_check_extension(env->kvm_state, KVM_CAP_TSC_CONTROL);
+    if (r && env->tsc_khz) {
+        r = kvm_vcpu_ioctl(env, KVM_SET_TSC_KHZ, env->tsc_khz);
+        if (r < 0) {
+            fprintf(stderr, "KVM_SET_TSC_KHZ failed\n");
+            return r;
+        }
+    }
+#endif
+
     qemu_add_vm_change_state_handler(cpu_update_state, env);
 
     return kvm_vcpu_ioctl(env, KVM_SET_CPUID2, &cpuid_data);
-- 
1.7.4.1