Re: [Xen-devel] [RFC][PATCH] Emulate instructions in vm86 mode

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

On 7/9/06 10:51, "Bastian Blank" <bastian@xxxxxxxxxxxx> wrote:

> This patch fixes the emulation of instructions in vm86 mode. It fetches
> them using cs and eip instead of only eip. This makes it at least
> possible to use the i945GM vesa bios from the running system.
> 
> I'm not sure if this is the correct fix or if we should call the gpf
> handler of the running system. At least the support in linux reports
> traps back to the userspace caller which is not possible if emulated in
> xen.

There are also data operands of some instructions that may need fixing
(INS/OUTS). What happens if you just bail to the guest's GPF handler if in
vm86 mode? I think the libint10 library in userspace will emulate all these
instructions itself.

 -- Keir



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