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KVM: VMX: Unregister posted interrupt wakeup handler on hardware unsetup

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commit ec5a4919fa7b7d8c7a2af1c7e799b1fe4be84343 upstream.

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: bf9f6ac8d749 ("KVM: Update Posted-Interrupts Descriptor when vCPU is blocked")
Cc: stable@vger.kernel.org
Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-Id: <20211009001107.3936588-3-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Sean Christopherson 2021-10-08 17:11:05 -07:00 committed by Greg Kroah-Hartman
parent b4a4c9dc44
commit 2f65b76c44
1 changed files with 5 additions and 2 deletions
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7
arch/x86/kvm/vmx/vmx.c
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@ -7586,6 +7586,8 @@ 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();
@ -7877,8 +7879,6 @@ 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)
@ -7900,6 +7900,9 @@ 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;
}