On Tue, Jun 01, 2010 at 03:41:55PM +0300, Avi Kivity wrote: > On 06/01/2010 01:46 PM, Michael S. Tsirkin wrote: >> Main difference is that vhost works fine with unlocked >> memory, paging it in on demand. iommu needs to unmap >> memory when it is swapped out or relocated. >> > So you'd just take the memory map and not pin anything. This way you > can reuse the memory map. > > But no, it doesn't handle the dirty bitmap, so no go. IOMMU mapped memory can not be swapped out because we can't do demand paging on io-page-faults with current devices. We have to pin _all_ userspace memory that is mapped into an IOMMU domain. Joerg -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
