• Paolo Bonzini's avatar
    KVM: nVMX: do not use dangling shadow VMCS after guest reset · 88dddc11
    Paolo Bonzini authored
    
    
    If a KVM guest is reset while running a nested guest, free_nested will
    disable the shadow VMCS execution control in the vmcs01.  However,
    on the next KVM_RUN vmx_vcpu_run would nevertheless try to sync
    the VMCS12 to the shadow VMCS which has since been freed.
    
    This causes a vmptrld of a NULL pointer on my machime, but Jan reports
    the host to hang altogether.  Let's see how much this trivial patch fixes.
    
    Reported-by: default avatarJan Kiszka <jan.kiszka@siemens.com>
    Cc: Liran Alon <liran.alon@oracle.com>
    Cc: stable@vger.kernel.org
    Signed-off-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
    88dddc11