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    KVM: VMX: Do not allow reexecute_instruction() when skipping MMIO instr · c4409905
    Sean Christopherson 提交于
    Re-execution after an emulation decode failure is only intended to
    handle a case where two or vCPUs race to write a shadowed page, i.e.
    we should never re-execute an instruction as part of MMIO emulation.
    As handle_ept_misconfig() is only used for MMIO emulation, it should
    pass EMULTYPE_NO_REEXECUTE when using the emulator to skip an instr
    in the fast-MMIO case where VM_EXIT_INSTRUCTION_LEN is invalid.
    
    And because the cr2 value passed to x86_emulate_instruction() is only
    destined for use when retrying or reexecuting, we can simply call
    emulate_instruction().
    
    Fixes: d391f120 ("x86/kvm/vmx: do not use vm-exit instruction length
                          for fast MMIO when running nested")
    Cc: Vitaly Kuznetsov <vkuznets@redhat.com>
    Signed-off-by: NSean Christopherson <sean.j.christopherson@intel.com>
    Cc: stable@vger.kernel.org
    Signed-off-by: NRadim Krčmář <rkrcmar@redhat.com>
    c4409905
vmx.c 400.6 KB