This is a note to let you know that I've just added the patch titled kvm: async_pf: fix rcu_irq_enter() with irqs enabled to the 4.9-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-async_pf-fix-rcu_irq_enter-with-irqs-enabled.patch and it can be found in the queue-4.9 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From bbaf0e2b1c1b4f88abd6ef49576f0efb1734eae5 Mon Sep 17 00:00:00 2001 From: Paolo Bonzini <pbonzini@xxxxxxxxxx> Date: Wed, 26 Apr 2017 16:56:26 +0200 Subject: kvm: async_pf: fix rcu_irq_enter() with irqs enabled MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit From: Paolo Bonzini <pbonzini@xxxxxxxxxx> commit bbaf0e2b1c1b4f88abd6ef49576f0efb1734eae5 upstream. native_safe_halt enables interrupts, and you just shouldn't call rcu_irq_enter() with interrupts enabled. Reorder the call with the following local_irq_disable() to respect the invariant. Reported-by: Ross Zwisler <ross.zwisler@xxxxxxxxxxxxxxx> Signed-off-by: Paolo Bonzini <pbonzini@xxxxxxxxxx> Acked-by: Paul E. McKenney <paulmck@xxxxxxxxxxxxxxxxxx> Tested-by: Wanpeng Li <wanpeng.li@xxxxxxxxxxx> Signed-off-by: Radim Krčmář <rkrcmar@xxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- arch/x86/kernel/kvm.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/arch/x86/kernel/kvm.c +++ b/arch/x86/kernel/kvm.c @@ -162,8 +162,8 @@ void kvm_async_pf_task_wait(u32 token) */ rcu_irq_exit(); native_safe_halt(); - rcu_irq_enter(); local_irq_disable(); + rcu_irq_enter(); } } if (!n.halted) Patches currently in stable-queue which might be from pbonzini@xxxxxxxxxx are queue-4.9/kvm-async_pf-fix-rcu_irq_enter-with-irqs-enabled.patch queue-4.9/kvm-async_pf-avoid-async-pf-injection-when-in-guest-mode.patch queue-4.9/kvm-cpuid-fix-read-write-out-of-bounds-vulnerability-in-cpuid-emulation.patch