This is a note to let you know that I've just added the patch titled KVM MMU: check pending exception before injecting APF to the 4.14-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-mmu-check-pending-exception-before-injecting-apf.patch and it can be found in the queue-4.14 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From 2a266f23550be997d783f27e704b9b40c4010292 Mon Sep 17 00:00:00 2001 From: Haozhong Zhang <haozhong.zhang@xxxxxxxxx> Date: Wed, 10 Jan 2018 21:44:42 +0800 Subject: KVM MMU: check pending exception before injecting APF From: Haozhong Zhang <haozhong.zhang@xxxxxxxxx> commit 2a266f23550be997d783f27e704b9b40c4010292 upstream. For example, when two APF's for page ready happen after one exit and the first one becomes pending, the second one will result in #DF. Instead, just handle the second page fault synchronously. Reported-by: Ross Zwisler <zwisler@xxxxxxxxx> Message-ID: <CAOxpaSUBf8QoOZQ1p4KfUp0jq76OKfGY4Uxs-Gg8ngReD99xww@xxxxxxxxxxxxxx> Reported-by: Alec Blayne <ab@xxxxxxxxx> Signed-off-by: Haozhong Zhang <haozhong.zhang@xxxxxxxxx> Signed-off-by: Paolo Bonzini <pbonzini@xxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- arch/x86/kvm/mmu.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) --- a/arch/x86/kvm/mmu.c +++ b/arch/x86/kvm/mmu.c @@ -3784,7 +3784,8 @@ static int kvm_arch_setup_async_pf(struc bool kvm_can_do_async_pf(struct kvm_vcpu *vcpu) { if (unlikely(!lapic_in_kernel(vcpu) || - kvm_event_needs_reinjection(vcpu))) + kvm_event_needs_reinjection(vcpu) || + vcpu->arch.exception.pending)) return false; if (!vcpu->arch.apf.delivery_as_pf_vmexit && is_guest_mode(vcpu)) Patches currently in stable-queue which might be from haozhong.zhang@xxxxxxxxx are queue-4.14/kvm-mmu-check-pending-exception-before-injecting-apf.patch