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Commit b7e31be3 authored by Radim Krčmář's avatar Radim Krčmář
Browse files

KVM: x86: fix vcpu initialization with userspace lapic 



Moving the code around broke this rare configuration.
Use this opportunity to finally call lapic reset from vcpu reset.

Reported-by: default avatar <syzbot+fb7a33a4b6c35007a72b@syzkaller.appspotmail.com>
Suggested-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
Fixes: 0b2e9904 ("KVM: x86: move LAPIC initialization after VMCS creation")
Cc: stable@vger.kernel.org
Signed-off-by: default avatarRadim Krčmář <rkrcmar@redhat.com>
parent 518e7b94

arch/x86/kvm/lapic.c

+4 −6
Original line number Diff line number Diff line
@@ -2002,14 +2002,13 @@ void kvm_lapic_set_base(struct kvm_vcpu *vcpu, u64 value) 


void kvm_lapic_reset(struct kvm_vcpu *vcpu, bool init_event)

{

	struct kvm_lapic *apic;

	struct kvm_lapic *apic = vcpu->arch.apic;

	int i;



	apic_debug("%s\n", __func__);

	if (!apic)

		return;



	ASSERT(vcpu);

	apic = vcpu->arch.apic;

	ASSERT(apic != NULL);

	apic_debug("%s\n", __func__);



	/* Stop the timer in case it's a reset to an active apic */

	hrtimer_cancel(&apic->lapic_timer.timer);
@@ -2568,7 +2567,6 @@ void kvm_apic_accept_events(struct kvm_vcpu *vcpu) 


	pe = xchg(&apic->pending_events, 0);

	if (test_bit(KVM_APIC_INIT, &pe)) {

		kvm_lapic_reset(vcpu, true);

		kvm_vcpu_reset(vcpu, true);

		if (kvm_vcpu_is_bsp(apic->vcpu))

			vcpu->arch.mp_state = KVM_MP_STATE_RUNNABLE;

arch/x86/kvm/x86.c

+2 −1
Original line number Diff line number Diff line
@@ -8060,7 +8060,6 @@ int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu) 
	kvm_vcpu_mtrr_init(vcpu);

	vcpu_load(vcpu);

	kvm_vcpu_reset(vcpu, false);

	kvm_lapic_reset(vcpu, false);

	kvm_mmu_setup(vcpu);

	vcpu_put(vcpu);

	return 0;
@@ -8103,6 +8102,8 @@ void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu) 


void kvm_vcpu_reset(struct kvm_vcpu *vcpu, bool init_event)

{

	kvm_lapic_reset(vcpu, init_event);



	vcpu->arch.hflags = 0;



	vcpu->arch.smi_pending = 0;