Re: [Xen-devel] [PATCH] x86/vvmx: Improvements to INVEPT instruction handling

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

> From: Andrew Cooper [mailto:andrew.cooper3@xxxxxxxxxx]
> Sent: Tuesday, February 07, 2017 12:55 AM
> 
>  * Latch current once at the start.
>  * Avoid the memory operand read for INVEPT_ALL_CONTEXT.  Experimentally, this
>    is how hardware behaves, and avoids an unnecessary pagewalk.
>  * Reject Reg/Reg encodings of the instruction.
>  * Audit eptp against maxphysaddr.
>  * Introduce and use VMX_INSN_INVALID_INV_OPERAND to correct the vmfail
>    semantics.
>  * Add extra newlines for clarity
> 
> Also, introduce some TODOs for further checks which should be performed.
> These checks are hard to perform at the moment, as there is no easy way to see
> which MSR values where given to the guest.
> 
> Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>

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

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