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target-i386: Fallback vcpu's TSC rate to value returned by KVM

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If no user-specified TSC rate is present, we will try to set
env->tsc_khz to the value returned by KVM_GET_TSC_KHZ. This patch
does not change the current functionality of QEMU and just
prepares for later patches to enable migrating vcpu's TSC rate.

Signed-off-by: Haozhong Zhang <haozhong.zhang@intel.com>
Reviewed-by: Eduardo Habkost <ehabkost@redhat.com>
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
This commit is contained in:
Haozhong Zhang 2015-11-24 11:33:55 +08:00 committed by Eduardo Habkost
parent f23a9db6bc
commit bcffbeeb82
1 changed files with 14 additions and 0 deletions
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14
target-i386/kvm.c
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@ -868,6 +868,20 @@ int kvm_arch_init_vcpu(CPUState *cs)
}
}
/* vcpu's TSC frequency is either specified by user, or following
* the value used by KVM if the former is not present. In the
* latter case, we query it from KVM and record in env->tsc_khz,
* so that vcpu's TSC frequency can be migrated later via this field.
*/
if (!env->tsc_khz) {
r = kvm_check_extension(cs->kvm_state, KVM_CAP_GET_TSC_KHZ) ?
kvm_vcpu_ioctl(cs, KVM_GET_TSC_KHZ) :
-ENOTSUP;
if (r > 0) {
env->tsc_khz = r;
}
}
if (has_xsave) {
env->kvm_xsave_buf = qemu_memalign(4096, sizeof(struct kvm_xsave));
}