Isaku Yamahata wrote: > 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.
Hi Isaku, so could you please check in the attached patch (the same as the old one I posted and updated the comment) first? For the calc_dom0_size() and the memory hole issues, we can fix them in a later patch. Thanks, -- Dexuan
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