Re: [Xen-devel] [PATCH RFC 8/9] xen: Generic instruction re-execution mechanism for execute faults

[Andrew Cooper <andrew.cooper3@xxxxxxxxxx>]

On 02/07/14 14:34, Razvan Cojocaru wrote:
> The Xen emulator is incapable of handling some instructions, which
> leads to the injection of an Invalid Opcode exception (#UD) inside
> the guest once an unsupported instruction is encountered.

This is (as far as I am aware) simply because Xen's current emulation
only expects to emulate instructions which trapped for MMIO or fault
reasons.

There is no conceptual problem with extending Xen's emulation code, as
we are now expecting to have to emulate instructions which would
otherwise never have hit x86_emulate.

~Andrew

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