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

[Roger Pau Monné <roger.pau@xxxxxxxxxx>]

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).

Roger.


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