KVM: x86: Properly handle APF vs disabled LAPIC situation

Async PF 'page ready' event may happen when LAPIC is (temporary) disabled.
In particular, Sebastien reports that when Linux kernel is directly booted
by Cloud Hypervisor, LAPIC is 'software disabled' when APF mechanism is
initialized. On initialization KVM tries to inject 'wakeup all' event and
puts the corresponding token to the slot. It is, however, failing to inject
an interrupt (kvm_apic_set_irq() -> __apic_accept_irq() -> !apic_enabled())
so the guest never gets notified and the whole APF mechanism gets stuck.
The same issue is likely to happen if the guest temporary disables LAPIC
and a previously unavailable page becomes available.

Do two things to resolve the issue:
- Avoid dequeuing 'page ready' events from APF queue when LAPIC is
  disabled.
- Trigger an attempt to deliver pending 'page ready' events when LAPIC
  becomes enabled (SPIV or MSR_IA32_APICBASE).

Reported-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Message-Id: <20210422092948.568327-1-vkuznets@redhat.com>
Cc: stable@vger.kernel.org
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

1 files changed, 6 insertions, 0 deletions

diff --git a/arch/x86/kvm/lapic.c b/arch/x86/kvm/lapic.c
index 0050f39e90d9..152591f9243a 100644
--- a/arch/x86/kvm/lapic.c
+++ b/arch/x86/kvm/lapic.c
@@ -296,6 +296,10 @@ static inline void apic_set_spiv(struct kvm_lapic *apic, u32 val)
 
 		atomic_set_release(&apic->vcpu->kvm->arch.apic_map_dirty, DIRTY);
 	}
+
+	/* Check if there are APF page ready requests pending */
+	if (enabled)
+		kvm_make_request(KVM_REQ_APF_READY, apic->vcpu);
 }
 
 static inline void kvm_apic_set_xapic_id(struct kvm_lapic *apic, u8 id)
@@ -2261,6 +2265,8 @@ void kvm_lapic_set_base(struct kvm_vcpu *vcpu, u64 value)
 		if (value & MSR_IA32_APICBASE_ENABLE) {
 			kvm_apic_set_xapic_id(apic, vcpu->vcpu_id);
 			static_branch_slow_dec_deferred(&apic_hw_disabled);
+			/* Check if there are APF page ready requests pending */
+			kvm_make_request(KVM_REQ_APF_READY, vcpu);
 		} else {
 			static_branch_inc(&apic_hw_disabled.key);
 			atomic_set_release(&apic->vcpu->kvm->arch.apic_map_dirty, DIRTY);