Re: [Xen-devel] [PATCH v2 4/4] xen: expose that grant table mappings update the IOMMU

[Konrad Rzeszutek Wilk <konrad@xxxxxxxxxx>]

On Thu, Apr 24, 2014 at 09:23:15AM +0100, Jan Beulich wrote:
> >>> On 24.04.14 at 09:43, <roger.pau@xxxxxxxxxx> wrote:
> > On 23/04/14 12:00, Jan Beulich wrote:
> >>>>> On 23.04.14 at 10:16, <roger.pau@xxxxxxxxxx> wrote:
> >>> Add a new XENFEAT_hvm_gntmap_supports_iommu that is used to check
> >>> whether the hypervisor properly updates the IOMMU on auto-translated
> >>> guests when doing a grant table map/unmap operation.
> >> 
> >> Considering Boris' pending introduction of a hypervisor capabilities
> >> CPUID leaf, I wonder whether we shouldn't stop surfacing HVM-only
> >> features via XENFEAT_* flags (which afaict originally were meant to
> >> be a PV vehicle only anyway).
> > 
> > I don't have a strong opinion on the best way to publish this feature,
> > so if you prefer to do it using the new CPUID leaf, I will rework this
> > patch (although I have to say using XENFEAT_* seems easier).
> 
> Let's explicitly ask a few others who may have an opinion either way
> (by way of adding them to the To: list).

Silence ..  :-)

How about just the easier path for now (XENFEAT_*)?
> 
> Jan
> 
> 
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