From b2decb623a42f21e5fe878fe3f9e612e06b62106 Mon Sep 17 00:00:00 2001
From: Ignacio Alvarado <ikalvarado@google.com>
Date: Fri, 4 Nov 2016 12:15:55 -0700
Subject: [PATCH] KVM: Disable irq while unregistering user notifier
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commit 1650b4ebc99da4c137bfbfc531be4a2405f951dd upstream.

Function user_notifier_unregister should be called only once for each
registered user notifier.

Function kvm_arch_hardware_disable can be executed from an IPI context
which could cause a race condition with a VCPU returning to user mode
and attempting to unregister the notifier.

Signed-off-by: Ignacio Alvarado <ikalvarado@google.com>
Fixes: 18863bdd60f8 ("KVM: x86 shared msr infrastructure")
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
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Reading git-format-patch failed