This is a note to let you know that I've just added the patch titled
KVM: VMX: Unregister posted interrupt wakeup handler on hardware unsetup
to the 5.14-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
kvm-vmx-unregister-posted-interrupt-wakeup-handler-on-hardware-unsetup.patch
and it can be found in the queue-5.14 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From ec5a4919fa7b7d8c7a2af1c7e799b1fe4be84343 Mon Sep 17 00:00:00 2001
From: Sean Christopherson <seanjc@xxxxxxxxxx>
Date: Fri, 8 Oct 2021 17:11:05 -0700
Subject: KVM: VMX: Unregister posted interrupt wakeup handler on hardware unsetup
From: Sean Christopherson <seanjc@xxxxxxxxxx>
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@xxxxxxxxxxxxxxx
Signed-off-by: Sean Christopherson <seanjc@xxxxxxxxxx>
Message-Id: <20211009001107.3936588-3-seanjc@xxxxxxxxxx>
Signed-off-by: Paolo Bonzini <pbonzini@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/x86/kvm/vmx/vmx.c | 7 +++++--
1 file changed, 5 insertions(+), 2 deletions(-)
--- a/arch/x86/kvm/vmx/vmx.c
+++ b/arch/x86/kvm/vmx/vmx.c
@@ -7517,6 +7517,8 @@ static void vmx_migrate_timers(struct kv
static void hardware_unsetup(void)
{
+ kvm_set_posted_intr_wakeup_handler(NULL);
+
if (nested)
nested_vmx_hardware_unsetup();
@@ -7844,8 +7846,6 @@ 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)
@@ -7869,6 +7869,9 @@ 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;
}
Patches currently in stable-queue which might be from seanjc@xxxxxxxxxx are
queue-5.14/kvm-vmx-unregister-posted-interrupt-wakeup-handler-on-hardware-unsetup.patch
queue-5.14/x86-irq-ensure-pi-wakeup-handler-is-unregistered-before-module-unload.patch
