On Mon, Jan 05, 2009 at 05:39:52PM +0800, Cui, Dexuan wrote: > Isaku Yamahata wrote: > > On x86 case p2m_lock/unlock() avoids the race, but ia64 doesn't have > > such lock. > > At this moment, the only HVM domain would be supported. > OK, I understand we can't support pv iommu before resolving the lockless p2m > issue. > > > The issue is dom0 case. I suppose it can be supported by mapping > > all the pages except xen pages at boot time and not iommu > > mapping/unmapping because those pages are already mapped to dom0 > > by intel_iommu_domain_init(). > I think actually we do this. > For the special pv guest Dom0, I think there is no issue here because > dom0->need_iommu is actually always 0 (when Dom0 boots up and xen assigns > all the devices to Dom0, xen doesn't invoke assign_device(), and invoking > iommu_domain_init()/intel_iommu_domain_init() doesn't cause need_iommu(dom0) > to be 1).
Okay, I missed that. -- yamahata _______________________________________________ Xen-ia64-devel mailing list Xen-ia64-devel@lists.xensource.com http://lists.xensource.com/xen-ia64-devel
