Re: [Qemu-devel] [PATCH v3 1/3] IOMMU: add VTD_CAP_CM to vIOMMU capability exposed to guest

[Aviv B.D.]

What is the best way to add this configuration option?

Aviv.

On Tue, May 24, 2016 at 12:25 PM Jan Kiszka <address@hidden> wrote:

> On 2016-05-24 10:14, Jason Wang wrote:
> > On 2016年05月22日 00:19, Aviv B.D wrote:
> >> From: "Aviv Ben-David" <address@hidden>
> >>
> >> This flag tells the guest to invalidate tlb cache also after unmap
> >> operations.
> >>
> >> Signed-off-by: Aviv Ben-David <address@hidden>
> >> ---
> >
> > Is this a guest visible behavior?  If yes, shouldn't we cache
> > translation fault conditions in IOTLB?
>
> It is guest visible, and this first of all means, besides requiring to
> be optional, that it definitely needs to be off for compat systems. Or
> it stays off by default.
>
> Jan
>
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