[Upstream Commit 8e6ed96cdd5001c55fccc80a17f651741c1ca7d2 From: Li RongQing lirongqing@baidu.com
when the vCPU was migrated, if its timer is expired, KVM _should_ fire the timer ASAP, zeroing the deadline here will cause the timer to immediately fire on the destination
Cc: Sean Christopherson seanjc@google.com Cc: Peter Shier pshier@google.com Cc: Jim Mattson jmattson@google.com Cc: Wanpeng Li wanpengli@tencent.com Cc: Paolo Bonzini pbonzini@redhat.com Signed-off-by: Li RongQing lirongqing@baidu.com Link: https://lore.kernel.org/r/20230106040625.8404-1-lirongqing@baidu.com Signed-off-by: Sean Christopherson seanjc@google.com
Cherry-picked from commit 8e6ed96cdd5001c55fccc80a17f651741c1ca7d2] Signed-off-by: David Hunter david.hunter.linux@gmail.com --- arch/x86/kvm/lapic.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-)
diff --git a/arch/x86/kvm/lapic.c b/arch/x86/kvm/lapic.c index c90fef0258c5..3cd590ace95a 100644 --- a/arch/x86/kvm/lapic.c +++ b/arch/x86/kvm/lapic.c @@ -1843,8 +1843,12 @@ static bool set_target_expiration(struct kvm_lapic *apic, u32 count_reg) if (unlikely(count_reg != APIC_TMICT)) { deadline = tmict_to_ns(apic, kvm_lapic_get_reg(apic, count_reg)); - if (unlikely(deadline <= 0)) - deadline = apic->lapic_timer.period; + if (unlikely(deadline <= 0)) { + if (apic_lvtt_period(apic)) + deadline = apic->lapic_timer.period; + else + deadline = 0; + } else if (unlikely(deadline > apic->lapic_timer.period)) { pr_info_ratelimited( "kvm: vcpu %i: requested lapic timer restore with "