• Wanpeng Li's avatar
    KVM: nVMX: Fix trying to cancel vmlauch/vmresume · bfcf83b1
    Wanpeng Li authored
    ------------[ cut here ]------------
    WARNING: CPU: 7 PID: 3861 at /home/kernel/ssd/kvm/arch/x86/kvm//vmx.c:11299 nested_vmx_vmexit+0x176e/0x1980 [kvm_intel]
    CPU: 7 PID: 3861 Comm: qemu-system-x86 Tainted: G        W  OE   4.13.0-rc4+ #11
    RIP: 0010:nested_vmx_vmexit+0x176e/0x1980 [kvm_intel]
    Call Trace:
     ? kvm_multiple_exception+0x149/0x170 [kvm]
     ? handle_emulation_failure+0x79/0x230 [kvm]
     ? load_vmcs12_host_state+0xa80/0xa80 [kvm_intel]
     ? check_chain_key+0x137/0x1e0
     ? reexecute_instruction.part.168+0x130/0x130 [kvm]
     nested_vmx_inject_exception_vmexit+0xb7/0x100 [kvm_intel]
     ? nested_vmx_inject_exception_vmexit+0xb7/0x100 [kvm_intel]
     vmx_queue_exception+0x197/0x300 [kvm_intel]
     kvm_arch_vcpu_ioctl_run+0x1b0c/0x2c90 [kvm]
     ? kvm_arch_vcpu_runnable+0x220/0x220 [kvm]
     ? preempt_count_sub+0x18/0xc0
     ? restart_apic_timer+0x17d/0x300 [kvm]
     ? kvm_lapic_restart_hv_timer+0x37/0x50 [kvm]
     ? kvm_arch_vcpu_load+0x1d8/0x350 [kvm]
     kvm_vcpu_ioctl+0x4e4/0x910 [kvm]
     ? kvm_vcpu_ioctl+0x4e4/0x910 [kvm]
     ? kvm_dev_ioctl+0xbe0/0xbe0 [kvm]
    
    The flag "nested_run_pending", which can override the decision of which should run
    next, L1 or L2. nested_run_pending=1 means that we *must* run L2 next, not L1. This
    is necessary in particular when L1 did a VMLAUNCH of L2 and therefore expects L2 to
    be run (and perhaps be injected with an event it specified, etc.). Nested_run_pending
    is especially intended to avoid switching  to L1 in the injection decision-point.
    
    This can be handled just like the other cases in vmx_check_nested_events, instead of
    having a special case in vmx_queue_exception.
    
    Cc: Paolo Bonzini <pbonzini@redhat.com>
    Cc: Radim Krčmář <rkrcmar@redhat.com>
    Signed-off-by: default avatarWanpeng Li <wanpeng.li@hotmail.com>
    Signed-off-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
    bfcf83b1
vmx.c 342 KB