Date: Mon, 08 Jun 2015 06:17:34 +0100 From: Bruce Simpson <bms@fastmail.net> To: Marcel Moolenaar <marcel@xcllnt.net> Cc: Marcel Moolenaar <marcel@FreeBSD.org>, src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org, wca@FreeBSD.org Subject: Re: svn commit: r284146 - in head/tools/bus_space: . C Python Message-ID: <1433740654.3134532.289382577.2D3A01C5@webmail.messagingengine.com> In-Reply-To: <F3885B60-B33A-4F89-B54C-A19DA85CF41C@xcllnt.net> References: <201506080323.t583NKWB098393@svn.freebsd.org> <1433739156.3126307.289375233.42FD30F0@webmail.messagingengine.com> <F3885B60-B33A-4F89-B54C-A19DA85CF41C@xcllnt.net>
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Marcel, (Cc: Will as he's expressed interest in this) No problem... still tied up here... On Mon, 8 Jun 2015, at 06:10, Marcel Moolenaar wrote: > > On Jun 7, 2015, at 9:52 PM, Bruce Simpson <bms@fastmail.net> wrote: > > Nice! Is there a man page or documentation for this anywhere? >=20 > Not yet. I want to flesh it out further before documenting. > I=E2=80=99m not sure the API is stable enough yet. I=E2=80=99m still figu= re > things out as I go. > > Also: is it feasible to extend to build/attach to a VirtIO function? > > (May be PCI, not MMIO). >=20 > I think so. If there=E2=80=99s an easy environment for me to play > with, I can take a look. I think qemu would do right? If you load a FreeBSD VM into KVM, and turn on host-guest sharing, you'll see a VirtIO function for Plan 9's v9fs exposed on the PCI bus. This speaks a Linux-specific variant of the 9P protocol, 9P2000.L. FreeBSD currently does not understand how to talk to it, nor do our existing 9p ports. BHyve doesn't support host-guest sharing (yet). Note: I neither claim nor argue that this is the most efficient host-guest solution -- there are anecdotal reports that the claims IBM have made in published papers cannot be verified in production -- but it makes sense to re-use (and perhaps improve upon) what IBM have done here, for the sake of interop more than anything else. There is a FUSE-based implementation in Python, py9p, which might serve as the basis for a prototype. NetBSD have a newer alternative but it looks like more work to make it talk to the VirtIO function. --=20 BMS (sent via webmail)
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