Re: [Xen-devel] [PATCH] Calculate correct instruction length for data-fault VM exits on VT-x systems

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

On 28 Apr 2006, at 10:02, Petersson, Mats wrote:

> I'll look at your previous suggestion of merging the MMIO emulation 
> into
> x86_emulate later on today. We probably do need to sum up the length 
> and
> pass it back to the caller - as that code doesn't know how to update 
> the
> correct field of the different processor architectures (vmcb vs. vmcs
> vs. stack-frame for Para-virtual machine). But it shouldn't be
> particularly hard to achieve this.
The emulator uses and updates the eip field of the passed-in regs 
structure. We may want to change this interface in future by having the 
caller explicitly pass in a buffer containing the instruction, and the 
number of valid bytes in the buffer.  Or add a 'fetch_insn_byte' 
callback hook to the emulator interface.
 -- Keir


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