Qin Chuanyu
2013-Sep-03 01:28 UTC
Re: Is fallback vhost_net to qemu for live migrate available?
On 2013/9/2 15:57, Wei Liu wrote:> On Sat, Aug 31, 2013 at 12:45:11PM +0800, Qin Chuanyu wrote: >> On 2013/8/30 0:08, Anthony Liguori wrote: >>> Hi Qin, >> >>>> By change the memory copy and notify mechanism ,currently virtio-net with >>>> vhost_net could run on Xen with good performance。 >>> >>> I think the key in doing this would be to implement a property >>> ioeventfd and irqfd interface in the driver domain kernel. Just >>> hacking vhost_net with Xen specific knowledge would be pretty nasty >>> IMHO. >>> >> Yes, I add a kernel module which persist virtio-net pio_addr and >> msix address as what kvm module did. Guest wake up vhost thread by >> adding a hook func in evtchn_interrupt. >> >>> Did you modify the front end driver to do grant table mapping or is >>> this all being done by mapping the domain's memory? >>> >> There is nothing changed in front end driver. Currently I use >> alloc_vm_area to get address space, and map the domain's memory as >> what what qemu did. >> > > You mean you're using xc_map_foreign_range and friends in the backend to > map guest memory? That's not very desirable as it violates Xen's > security model. It would not be too hard to pass grant references > instead of guest physical memory address IMHO. >In fact, I did what virtio-net have done in Qemu. I think security is a pseudo question because Dom0 is under control. Host could access memory of guest in KVM much easier than Xen, but I hadn't heard someone said KVM is un-secret. Regards Qin chuanyu _______________________________________________ Xen-devel mailing list Xen-devel@lists.xen.org http://lists.xen.org/xen-devel