KVM: x86: Properly handle APF vs disabled LAPIC situation

stable inclusion
from stable-v5.10.119
commit 74c6e5d584354c6126f1231667f9d8e85d7f536f
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I5L6BB

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=74c6e5d584354c6126f1231667f9d8e85d7f536f

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

commit 2f15d027 upstream.

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: NSebastien Boeuf <sebastien.boeuf@intel.com>
Signed-off-by: NVitaly Kuznetsov <vkuznets@redhat.com>
Message-Id: <20210422092948.568327-1-vkuznets@redhat.com>
Cc: stable@vger.kernel.org
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>
[Guoqing: backport to 5.10-stable ]
Signed-off-by: NGuoqing Jiang <guoqing.jiang@linux.dev>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: NZheng Zengkai <zhengzengkai@huawei.com>
Acked-by: NXie XiuQi <xiexiuqi@huawei.com>

arch/x86/kvm/lapic.c

@@ -297,6 +297,10 @@ 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)
@@ -2265,6 +2269,8 @@ 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_key_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_key_slow_inc(&apic_hw_disabled.key);
 			atomic_set_release(&apic->vcpu->kvm->arch.apic_map_dirty, DIRTY);

arch/x86/kvm/x86.c

@@ -11264,7 +11264,7 @@ bool kvm_arch_can_dequeue_async_page_present(struct kvm_vcpu *vcpu)
 	if (!kvm_pv_async_pf_enabled(vcpu))
 		return true;
 	else
-		return apf_pageready_slot_free(vcpu);
+		return kvm_lapic_enabled(vcpu) && apf_pageready_slot_free(vcpu);
 }
 
 void kvm_arch_start_assignment(struct kvm *kvm)