Date: Mon, 22 Oct 2007 19:27:25 +0800 From: gnn@freebsd.org To: "Kip Macy" <kip.macy@gmail.com> Cc: freebsd-arch@freebsd.org Subject: Re: Should Xen be a sub-arch or a build option? Message-ID: <m2bqarl78i.wl%gnn@neville-neil.com> In-Reply-To: <b1fa29170710212056x5649a858n5202b78fc3e55589@mail.gmail.com> References: <b1fa29170710212056x5649a858n5202b78fc3e55589@mail.gmail.com>
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At Sun, 21 Oct 2007 20:56:35 -0700, Kip Macy wrote: > > Let me say in advance that this is not an invitation to discuss the > technical merits of xen. This is purely a request to discuss how one > would structure the tree were one to import it into CVS. > > Hypothetically speaking, if one were to import Xen support into CVS > what would be the best way to go about it? > > There are a number of choices when doing it as a sub-arch: > - A separate directory for i386 and amd64 > - sys/xen-i386 > - sys/xen-amd64 > - A shared directory as most of the bits will be shared: > - sys/xen - common bits > - sys/xen/i386 - i386 specific bits > - sys/xen/amd64 - amd64 specific bits > If most of the bits will be shared, then lets share them, that is, use the second proposal. I couldn't find a good example in the tree for a precedent, though the powerpc might come close, with its powermac and powerpc sub-directories. > It could, in principle, also be done as a build option. I'm not sure > how well it would mesh with the existing build tools as there are a > number of files that I would not want to compile in (e.g. code that > talked directly to the BIOS) that is normally built by default. In > that case I would structure it: > > - sys/i386/xen - xen specific bits for i386 > - sys/amd64/xen - xen specific bits for amd64 > > > There is also a question of where the drivers should be put. I propose > that they would be put under sys/dev/xen, so you would have e.g. > sys/dev/xen/xennet, sys/dev/xen/xenblk etc. Yes, this makes sense too. Thanks, George
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