Re: [Xen-devel] [PATCH] x86/ats: Disable Address Translation Services by default

[Suravee Suthikulpanit <suravee.suthikulpanit@xxxxxxx>]

On 08/28/2014 02:32 AM, Jan Beulich wrote:
> > > > On 28.08.14 at 09:08, <suravee.suthikulpanit@xxxxxxx> wrote:
> > I have verified that PCI device pass-through works with ATS disabled.
> > Although, could you please help described how "asynchronous queued
> > invalidation support" supposed to work?
> Are asking about the abstract model, or the specific implementation?
> The former is quite obvious is think (utilize the respective interrupt to
> get notified of completions and suspend the execution in the current
> context until then),
So, what Andrew is saying is that the current implementation which uses 
the "synchronous wait for completion" is not safe? May be I'm not 
getting the whole picture here of how it is unsafe.
Thanks,

Suravee

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