linux-kernel - [PATCH] KVM: flush deferred static key before checking it

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Date:   Fri, 26 Feb 2021 05:08:53 -0500
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Cc:     David Woodhouse <dwmw@...zon.co.uk>
Subject: [PATCH] KVM: flush deferred static key before checking it

A missing flush would cause the static branch to trigger incorrectly.

Cc: David Woodhouse <dwmw@...zon.co.uk>
Signed-off-by: Paolo Bonzini <pbonzini@...hat.com>
---
 arch/x86/kvm/x86.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 1d2bc89431a2..bfc928495bd4 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -8039,6 +8039,7 @@ void kvm_arch_exit(void)
 	kvm_mmu_module_exit();
 	free_percpu(user_return_msrs);
 	kmem_cache_destroy(x86_fpu_cache);
+	static_key_deferred_flush(&kvm_xen_enabled);
 	WARN_ON(static_branch_unlikely(&kvm_xen_enabled.key));
 }
 
-- 
2.26.2