[PATCH 6.1 298/321] KVM: x86: fire timer when it is migrated and expired, and in oneshot mode

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6.1-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Li RongQing <lirongqing@xxxxxxxxx>

commit 8e6ed96cdd5001c55fccc80a17f651741c1ca7d2 upstream.

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@xxxxxxxxxx>
Cc: Peter Shier <pshier@xxxxxxxxxx>
Cc: Jim Mattson <jmattson@xxxxxxxxxx>
Cc: Wanpeng Li <wanpengli@xxxxxxxxxxx>
Cc: Paolo Bonzini <pbonzini@xxxxxxxxxx>
Signed-off-by: Li RongQing <lirongqing@xxxxxxxxx>
Link: https://lore.kernel.org/r/20230106040625.8404-1-lirongqing@xxxxxxxxx
Signed-off-by: Sean Christopherson <seanjc@xxxxxxxxxx>
Signed-off-by: David Hunter <david.hunter.linux@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 arch/x86/kvm/lapic.c |    8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

--- a/arch/x86/kvm/lapic.c
+++ b/arch/x86/kvm/lapic.c
@@ -1843,8 +1843,12 @@ static bool set_target_expiration(struct
 		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 "






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