[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] [RFC] VirtFS support on Xen
On Sat, Jan 23, 2016 at 10:35:44AM -0500, Konrad Rzeszutek Wilk wrote: > On January 23, 2016 9:50:30 AM EST, Wei Liu <wei.liu2@xxxxxxxxxx> wrote: > >On Sat, Jan 23, 2016 at 01:33:40PM +0800, Bob Liu wrote: > >> > >> 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 > >> > > > >Yes. Your understanding is correct. > > > >> 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? > >> > > > >Yes. There will be code in both QEMU and Linux kernel. > > > > Why not just make the VirtIO MMIO implementation work with Xen? That would > give you what you need right? > That goes back to the old topic of how to make VirtIO work on Xen (PV in particular). It's not easy task by any means. Wei. > >Wei. > > > >> Bob > > > >_______________________________________________ > >Xen-devel mailing list > >Xen-devel@xxxxxxxxxxxxx > >http://lists.xen.org/xen-devel > > _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel
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