Re: [Xen-devel] [PATCH 2/9] x86/np2m: Have invept flush all np2m entries with the same base pointer

[George Dunlap <george.dunlap@xxxxxxxxxx>]

On 10/02/2017 10:37 AM, Sergey Dyasli wrote:
> On Fri, 2017-09-29 at 16:01 +0100, George Dunlap wrote:
>> nvmx_handle_invept() updates current's np2m just to flush it.  This is
>> not only wasteful, but ineffective: if several L2 vcpus share the same
>> np2m base pointer, they all need to be flushed (not only the current
>> one).
> 
> I don't follow this completely. L1 will use INVEPT on each vCPU that
> shares the same np2m pointer. The main idea here was not to update
> current's np2m just to flush it.

Hmm, yes the INVEPT thing is true.  But if that's the case, why do we
need np2m_flush_base() to loop over the whole list and flush all np2ms
with the same pointer?

 -George

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