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

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 08.05.14 at 20:39, <konrad@xxxxxxxxxx> wrote:
> 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_*)?

While continuing to think it being the wrong direction, I also don't want
to stand in the way of this making progress...

Jan


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