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| author | Ralf Baechle <ralf@linux-mips.org> | 2014-06-04 22:53:02 +0200 |
|---|---|---|
| committer | Ralf Baechle <ralf@linux-mips.org> | 2014-06-04 22:53:02 +0200 |
| commit | f8647b506d7116a1a3accd8d618184096e85f50b (patch) | |
| tree | f10bc7201fda2a36c035548a0ea62210ad57adb6 /arch/x86/kvm/x86.c | |
| parent | 1d421ca9d7edbac1eb118631ee039d50ab54771e (diff) | |
| parent | f7a89f1b8eb598ac5da61c9795b3d847baa73d12 (diff) | |
| download | linux-f8647b506d7116a1a3accd8d618184096e85f50b.tar.gz | |
Merge branch '3.15-fixes' into mips-for-linux-next
Diffstat (limited to 'arch/x86/kvm/x86.c')
| -rw-r--r-- | arch/x86/kvm/x86.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index b6c0bacca9bd..20316c67b824 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -106,6 +106,8 @@ EXPORT_SYMBOL_GPL(kvm_max_guest_tsc_khz); static u32 tsc_tolerance_ppm = 250; module_param(tsc_tolerance_ppm, uint, S_IRUGO | S_IWUSR); +static bool backwards_tsc_observed = false; + #define KVM_NR_SHARED_MSRS 16 struct kvm_shared_msrs_global { @@ -1486,7 +1488,8 @@ static void pvclock_update_vm_gtod_copy(struct kvm *kvm) &ka->master_kernel_ns, &ka->master_cycle_now); - ka->use_master_clock = host_tsc_clocksource & vcpus_matched; + ka->use_master_clock = host_tsc_clocksource && vcpus_matched + && !backwards_tsc_observed; if (ka->use_master_clock) atomic_set(&kvm_guest_has_master_clock, 1); @@ -6945,6 +6948,7 @@ int kvm_arch_hardware_enable(void *garbage) */ if (backwards_tsc) { u64 delta_cyc = max_tsc - local_tsc; + backwards_tsc_observed = true; list_for_each_entry(kvm, &vm_list, vm_list) { kvm_for_each_vcpu(i, vcpu, kvm) { vcpu->arch.tsc_offset_adjustment += delta_cyc; |