From: Sean Christopherson <seanjc@google.com>
To: Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
x86@kernel.org, Paolo Bonzini <pbonzini@redhat.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>,
Sean Christopherson <seanjc@google.com>,
Vitaly Kuznetsov <vkuznets@redhat.com>,
Wanpeng Li <wanpengli@tencent.com>,
Jim Mattson <jmattson@google.com>, Joerg Roedel <joro@8bytes.org>,
linux-kernel@vger.kernel.org, kvm@vger.kernel.org
Subject: [PATCH 2/4] KVM: VMX: Unregister posted interrupt wakeup handler on hardware unsetup
Date: Fri, 8 Oct 2021 17:11:05 -0700 [thread overview]
Message-ID: <20211009001107.3936588-3-seanjc@google.com> (raw)
In-Reply-To: <20211009001107.3936588-1-seanjc@google.com>
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>
---
arch/x86/kvm/vmx/vmx.c | 7 +++++--
1 file changed, 5 insertions(+), 2 deletions(-)
diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
index 1c8b2b6e7ed9..bfdcdb399212 100644
--- a/arch/x86/kvm/vmx/vmx.c
+++ b/arch/x86/kvm/vmx/vmx.c
@@ -7553,6 +7553,8 @@ 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();
@@ -7881,8 +7883,6 @@ 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)
@@ -7906,6 +7906,9 @@ 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;
}
--
2.33.0.882.g93a45727a2-goog
next prev parent reply other threads:[~2021-10-09 0:11 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-10-09 0:11 [PATCH 0/4] x86/x86: KVM: Fixes for KVM's PI wakeup handler Sean Christopherson
2021-10-09 0:11 ` [PATCH 1/4] x86/irq: Ensure PI wakeup handler is unregistered before module unload Sean Christopherson
2021-10-09 0:11 ` Sean Christopherson [this message]
2021-10-09 0:11 ` [PATCH 3/4] x86/irq: KVM: Harden posted interrupt (un)registration paths Sean Christopherson
2021-10-21 19:42 ` Paolo Bonzini
2021-10-09 0:11 ` [PATCH 4/4] KVM: VMX: Register posted interrupt wakeup handler iff APICv is enabled Sean Christopherson
2021-10-21 19:43 ` Paolo Bonzini
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