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

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> 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).

Jan


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