[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] [RFC] VirtFS support on Xen
On 01/22/2016 06:50 PM, Wei Liu wrote: > On Fri, Jan 22, 2016 at 06:45:30PM +0800, Bob Liu wrote: >> Hi Wei, >> >> On 01/21/2016 06:59 PM, Wei Liu wrote: >>> On Thu, Jan 21, 2016 at 10:50:08AM +0000, David Vrabel wrote: >>>> On 21/01/16 10:28, Wei Liu wrote: >>>>> [RFC] VirtFS support on Xen >>>>> >>>>> # Introduction >>>>> >>>>> QEMU/KVM supports file system passthrough via an interface called >>>>> VirtFS [0]. VirtFS is in turn implemented with 9pfs protocol [1] and >>>>> VirtIO transport. >>>>> >>>>> Xen used to have its own implementation of file system passthrough >>>>> called XenFS, but that has been inactive for a few years. The latest >>>>> update was in 2009 [2]. >>>>> >>>>> This project aims to add VirtFS support on Xen. This is more >>>>> sustainable than inventing our own wheel.# >>>> >>>> What's the use case for this? Who wants this feature? >>>> >>> >>> Anyone who wants file system passthrough. More specifically, VM-based >>> container solutions can share files from host file system. >>> >> >> I'm a bit confused, can't we just use the VirtFS of Qemu? >> E.g >> ./configure --with-extra-qemuu-configure-args="--enable-virtfs" >> > > Yes, in theory you can -- with VirtIO transport. But I'm not sure if > Virtio has been fixed to work with Xen. That also means you need QEMU > emulation, which we don't really need (or want) when running in PV or > PVH mode. > Just make sure if I get it right, in the KVM case: Linux guest(v9fs-client) -> VirtIO transport -> Qemu(v9fs-server) -> Local file system in Host And your plan is: DomU(v9fs-client) -> XEN transport:grant map based -> Qemu(v9fs-server) -> Local file system in Dom0 Which means we need to implement a XEN-transport in linux/net/9p/, and also make Qemu can recognize this transport because we need Qemu to run as the v9fs-server anyway? Bob _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel
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