From: David Woodhouse When doing TSC upscaling in software, e.g. when the guest TSC frequency is configured to run faster than the host without hardware support, always advance guest TSC to "now", not to the master clock's reference values, which represents some time in the past. In master clock mode, there are two points of time which need to be taken into account. First there is the master clock reference point, stored in kvm->arch.master_kernel_ns (and associated host TSC ->master_cycle_now). Secondly, there is the time *now*, at the point kvm_update_guest_time() is being called. With software TSC upscaling, the guest TSC is getting further and further ahead of the host TSC as time elapses. So at time "now", the guest TSC should be further ahead of the host, than it was at master_kernel_ns. Not taking that into account means KVM was advancing the guest TSC only by the amount appropriate for the snapshot taken in the past, *not* to the current time (which is what RDTSC is supposed to return). Signed-off-by: David Woodhouse Co-developed-by: Sean Christopherson Signed-off-by: Sean Christopherson --- arch/x86/kvm/x86.c | 29 ++++++++++++++++++++++------- 1 file changed, 22 insertions(+), 7 deletions(-) diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index 070a12535788..cd438d06e4cc 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -1796,12 +1796,11 @@ static void kvm_setup_guest_pvclock(struct pvclock_vcpu_time_info *ref_hv_clock, int kvm_guest_time_update(struct kvm_vcpu *v) { + u64 tgt_tsc_hz, tsc_timestamp, host_tsc, master_tsc, master_ns; struct kvm_arch *ka __maybe_unused = &v->kvm->arch; struct pvclock_vcpu_time_info hv_clock = {}; - u64 tgt_tsc_hz; struct kvm_vcpu_arch *vcpu = &v->arch; s64 kernel_ns; - u64 tsc_timestamp, host_tsc; /* * If the host uses TSC clock, then passthrough TSC as stable @@ -1814,10 +1813,16 @@ int kvm_guest_time_update(struct kvm_vcpu *v) do { seq = read_seqcount_begin(&ka->pvclock_sc); use_master_clock = ka->use_master_clock; - if (use_master_clock) { - host_tsc = ka->master_cycle_now; - kernel_ns = ka->master_kernel_ns; + if (!use_master_clock) + continue; + + if (!kvm_get_time_and_clockread(&kernel_ns, &host_tsc)) { + use_master_clock = false; + continue; } + + master_tsc = ka->master_cycle_now; + master_ns = ka->master_kernel_ns; } while (read_seqcount_retry(&ka->pvclock_sc, seq)); #else const bool use_master_clock = false; @@ -1883,8 +1888,18 @@ int kvm_guest_time_update(struct kvm_vcpu *v) hv_clock.tsc_shift = vcpu->pvclock_tsc_shift; hv_clock.tsc_to_system_mul = vcpu->pvclock_tsc_mul; - hv_clock.tsc_timestamp = tsc_timestamp; - hv_clock.system_time = kernel_ns + v->kvm->arch.kvmclock_offset; + /* + * If the master clock is NOT in use, the reference time placed in the + * hv_clock is "now". If master clock is in use, the reference time is + * the master clock's snapshot from some time in the past, not "now". + */ + if (use_master_clock) { + hv_clock.tsc_timestamp = kvm_read_l1_tsc(v, master_tsc); + hv_clock.system_time = master_ns + v->kvm->arch.kvmclock_offset; + } else { + hv_clock.tsc_timestamp = tsc_timestamp; + hv_clock.system_time = kernel_ns + v->kvm->arch.kvmclock_offset; + } /* If the host uses TSC clocksource, then it is stable */ hv_clock.flags = 0; -- 2.55.0.571.g244d577d93-goog