[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] RE: [Xen-devel] [RFC][PATCH] 0/9 Populate-on-demand memory
Tian, Kevin wrote: >> From: Han, Weidong >> Sent: Thursday, December 25, 2008 1:43 PM >>>> >>>> At any rate, until we have that worked out, we should probably add >>>> some "seatbelt" code to make sure that people don't use PoD for a >>>> VT-d enabled domain. I know absolutely nothing about the VT-d >>>> code; could you either write a patch to do this check, or give me >>>> an idea of the simplest thing to check? >>> >>> Weidong works on VT-d and could give comments on exact point to >>> check. >>> >> >> You can simply check "iommu_enabled" to know whether IOMMU >> including VT-d and AMD IOMMU is used or not. >> > > Weidong, does iommu_enabled indicate IOMMU h/w availability? > Then you'll have this nice feature disabled on most new platform > with IOMMU shipped. :-) Here a domain-based check is required, > i.e. PoD is only appliable when target domain is not passthroughed > with any device. > > Thanks, > Kevin iommu_enabled will be set when IOMMU h/w is available and user sets "iommu=1" in grub to use it. Because device hotplug with VT-d is already supported, I think domain-based check is not enough, it's better to disable PoD when iommu_enabled is set. Regards, Weidong _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel
|
Lists.xenproject.org is hosted with RackSpace, monitoring our |