Re: [Xen-devel] [PATCH v2] x86/HVM: restrict permitted instructions during special purpose emulation

["Tian, Kevin" <kevin.tian@xxxxxxxxx>]

> From: Jan Beulich [mailto:JBeulich@xxxxxxxx]
> Sent: Thursday, January 05, 2017 6:55 PM
> 
> Most invocations of the instruction emulator are for VM exits where the
> set of legitimate instructions (i.e. ones capable of causing the
> respective exit) is rather small. Restrict the permitted sets via a new
> callback, at once eliminating the abuse of handle_mmio() for non-MMIO
> operations.
> 
> A seemingly unrelated comment adjustment is being done here to keep
> x86_emulate() in sync with x86_insn_is_mem_write() (in the context of
> which this was found to be wrong).
> 
> Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>

Reviewed-by: Kevin Tian <kevin.tian@xxxxxxxxx>

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