On 11/12/2009 02:26 PM, Gleb Natapov wrote:
- if (vcpu->arch.exception.pending) { - switch(vcpu->arch.exception.nr) { - case DF_VECTOR: - /* triple fault -> shutdown */ - set_bit(KVM_REQ_TRIPLE_FAULT,&vcpu->requests); - return; - case PF_VECTOR: - vcpu->arch.exception.nr = DF_VECTOR; - vcpu->arch.exception.error_code = 0; - return; - default: - /* replace previous exception with a new one in a hope - that instruction re-execution will regenerate lost - exception */ - vcpu->arch.exception.pending = false; - break;When exceptions are handled serially previous exception have to be replaced by new one. Think about #PF during #DE. #PF should be handled first before #DE can proceed.
"replacing" exceptions is dangerous in the case of debug exceptions and machine checks, since restarting execution won't recover them.
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