Re: [Xen-devel] [PATCH 4/6] x86/emulate: Support for emulating software event injection

[Aravind Gopalakrishnan <aravind.gopalakrishnan@xxxxxxx>]

On 9/23/2014 10:03 AM, Andrew Cooper wrote:
> AMD SVM requires all software events to have their injection emulated if
> hardware lacks NextRIP support.  In addition, `icebp` (opcode 0xf1) injection
> requires emulation in all cases, even with hardware NextRIP support.
>
> Emulating full control transfers is overkill for our needs.  All that matters
> is that guest userspace can't bypass the descriptor DPL check.  Any guest OS
> which would incur other faults as part of injection is going to end up with a
> double fault instead, and won't be in a position to care that the faulting eip
> is wrong.
>
> Reported-by: Andrei LUTAS <vlutas@xxxxxxxxxxxxxxx>
> Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
> Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
> CC: Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>
> CC: Suravee Suthikulpanit <suravee.suthikulpanit@xxxxxxx>
> CC: Aravind Gopalakrishnan <Aravind.Gopalakrishnan@xxxxxxx>
Reviewed-by: Aravind Gopalakrishnan <Aravind.Gopalakrishnan@xxxxxxx>



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