Commit ec5a4919 authored by Sean Christopherson's avatar Sean Christopherson Committed by Paolo Bonzini
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KVM: VMX: Unregister posted interrupt wakeup handler on hardware unsetup 



Unregister KVM's posted interrupt wakeup handler during unsetup so that a
spurious interrupt that arrives after kvm_intel.ko is unloaded doesn't
call into freed memory.

Fixes: bf9f6ac8 ("KVM: Update Posted-Interrupts Descriptor when vCPU is blocked")
Cc: stable@vger.kernel.org
Signed-off-by: default avatarSean Christopherson <seanjc@google.com>
Message-Id: <20211009001107.3936588-3-seanjc@google.com>
Signed-off-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
parent 6ff53f6a

arch/x86/kvm/vmx/vmx.c

+5 −2
Original line number Diff line number Diff line
@@ -7555,6 +7555,8 @@ static void vmx_migrate_timers(struct kvm_vcpu *vcpu) 


static void hardware_unsetup(void)

{

	kvm_set_posted_intr_wakeup_handler(NULL);



	if (nested)

		nested_vmx_hardware_unsetup();
@@ -7885,8 +7887,6 @@ static __init int hardware_setup(void) 
		vmx_x86_ops.request_immediate_exit = __kvm_request_immediate_exit;

	}



	kvm_set_posted_intr_wakeup_handler(pi_wakeup_handler);



	kvm_mce_cap_supported |= MCG_LMCE_P;



	if (pt_mode != PT_MODE_SYSTEM && pt_mode != PT_MODE_HOST_GUEST)
@@ -7910,6 +7910,9 @@ static __init int hardware_setup(void) 
	r = alloc_kvm_area();

	if (r)

		nested_vmx_hardware_unsetup();



	kvm_set_posted_intr_wakeup_handler(pi_wakeup_handler);



	return r;

}