Re: [Xen-devel] [V0 PATCH 3/6] AMD-PVH: call hvm_emulate_one instead of handle_mmio

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 22.08.14 at 20:52, <mukesh.rathor@xxxxxxxxxx> wrote:
> On Fri, 22 Aug 2014 10:50:01 +0100
> "Jan Beulich" <JBeulich@xxxxxxxx> wrote:
>> Also - how come at least the use of the function in VMX's
>> EXIT_REASON_IO_INSTRUCTION handling is no problem for PVH,
>> but SVM's VMEXIT_IOIO one is?
> 
> Yup, missed that one. That would need to be addressed. 
> 
> I guess the first step would be to do a non-pvh patch to fix calling
> handle_mmio for non-mmio purposes.  Since, it applies to both vmx/svm, 
> perhaps an hvm function. Let me do that first, and then pvh can
> piggyback on that.

Problem being that INS and OUTS can very well address MMIO
on the memory side of the operation (while right now
hvmemul_rep_{ins,outs}() fail such operations, this merely means
they'd get emulated one by one instead of accelerated as multiple
ops in one go).

Also looking at handle_mmio() once again - it being just a relatively
thin wrapper around hvm_emulate_one(), can you remind me again
what in this small function it was that breaks on PVH? It would seem
to me that you'd rather want a clone of hvm_emulate_one() with a
different struct x86_emulate_ops passed in.

Jan


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