Justin T. Gibbs
2010-Jan-13 22:00 UTC
[Xen-devel] IOMMU support for HVM grant table mappings
Xen 4.0 recently added support for grant table mappings in the HVM P2M tables. The current code explicitly avoids adding an IOMMU mapping in this case. Is this an oversight or is there an architectural reason that the IOMMU is not updated? This seems to be the last piece needed to allow HVM driver domains with PCI pass-thru devices to function without extra memory copies. Thanks, Justin _______________________________________________ Xen-devel mailing list Xen-devel@lists.xensource.com http://lists.xensource.com/xen-devel
Keir Fraser
2010-Jan-14 09:30 UTC
Re: [Xen-devel] IOMMU support for HVM grant table mappings
It''s probably an oversight. -- Keir On 13/01/2010 22:00, "Justin T. Gibbs" <gibbs@scsiguy.com> wrote:> Xen 4.0 recently added support for grant table mappings in the HVM P2M > tables. > The current code explicitly avoids adding an IOMMU mapping in this case. > Is this an oversight or is there an architectural reason that the IOMMU is > not updated? This seems to be the last piece needed to allow HVM driver > domains with PCI pass-thru devices to function without extra memory copies. > > Thanks, > Justin > > > _______________________________________________ > Xen-devel mailing list > Xen-devel@lists.xensource.com > http://lists.xensource.com/xen-devel_______________________________________________ Xen-devel mailing list Xen-devel@lists.xensource.com http://lists.xensource.com/xen-devel