[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] Re: Crash with c/s 20097 (x86 vmx: Update EIP when appropriate during task switch)
On 02/12/2009 11:47, "Tim Deegan" <Tim.Deegan@xxxxxxxxxxxxx> wrote: > The __get_instruction_length() _isn't_ safe in those cases where we > later explicitly set inst_len to zero (and possibly in other cases). Argh, stupid, and probably my mistake. I'll push the __get_instruction_length() inside the if()s. > The cases of VM exits encountered during delivery of a software > interrupt, privileged software exception, or software exception include > those encountered during delivery of events injected as part of VM > entry (see Section 22.5.1.2). If the original event was injected as > part of VM entry, this field receives the value of the VM-entry > instruction length. > > Does that mean that if we inject a fault and the guest routes it through > a task switch gate, we'll see the length of VMENTER here? (And should > we be advancing EIP in that case anyway?) Fortunately we never inject software interrupts or exceptions. I reworked the code to avoid that a long time ago, due to just such concerns. Possibly we should even ASSERT as such in the event-injection functions. -- Keir _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel
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