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    Subject[PATCH 4.14 012/195] KVM MMU: check pending exception before injecting APF
    Date
    4.14-stable review patch.  If anyone has any objections, please let me know.

    ------------------

    From: Haozhong Zhang <haozhong.zhang@intel.com>

    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@gmail.com>
    Message-ID: <CAOxpaSUBf8QoOZQ1p4KfUp0jq76OKfGY4Uxs-Gg8ngReD99xww@mail.gmail.com>
    Reported-by: Alec Blayne <ab@tevsa.net>
    Signed-off-by: Haozhong Zhang <haozhong.zhang@intel.com>
    Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

    ---
    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))

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