[Bug 72381] [Nested] L1 call trace when create windows 7 guest as L2 guest.

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https://bugzilla.kernel.org/show_bug.cgi?id=72381

--- Comment #4 from Zhou, Chao <chao.zhou@intel.com> ---
this commit fixed the bug:
commit 9242b5b60df8b13b469bc6b7be08ff6ebb551ad3
Author: Bandan Das <bsd@redhat.com>
Date:   Tue Jul 8 00:30:23 2014 -0400

    KVM: x86: Check for nested events if there is an injectable interrupt

    With commit b6b8a1451fc40412c57d1 that introduced
    vmx_check_nested_events, checks for injectable interrupts happen
    at different points in time for L1 and L2 that could potentially
    cause a race. The regression occurs because KVM_REQ_EVENT is always
    set when nested_run_pending is set even if there's no pending interrupt.
    Consequently, there could be a small window when check_nested_events
    returns without exiting to L1, but an interrupt comes through soon
    after and it incorrectly, gets injected to L2 by inject_pending_event
    Fix this by adding a call to check for nested events too when a check
    for injectable interrupt returns true

    Signed-off-by: Bandan Das <bsd@redhat.com>
    Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

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