KVM: x86: support using the vmx preemption timer for tsc deadline timer

[mirror_ubuntu-hirsute-kernel.git] / arch / x86 / kvm / x86.c

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index ab2f45a50bb5b8bdbbcd625d3cad2ae5bcd5d031..1f4b2926a5a32d0731a0a390392c892dd37b0131 100644 (file)
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -2740,6 +2740,11 @@ void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
                                rdtsc() - vcpu->arch.last_host_tsc;
                if (tsc_delta < 0)
                        mark_tsc_unstable("KVM discovered backwards TSC");
+
+               if (kvm_lapic_hv_timer_in_use(vcpu) &&
+                               kvm_x86_ops->set_hv_timer(vcpu,
+                                       kvm_get_lapic_tscdeadline_msr(vcpu)))
+                       kvm_lapic_switch_to_sw_timer(vcpu);
                if (check_tsc_unstable()) {
                        u64 offset = kvm_compute_tsc_offset(vcpu,
                                                vcpu->arch.last_guest_tsc);