xen-users
[Xen-users] Re: Merge Xen (the hypervisor) into Linux
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To: |
Theodore Tso <tytso@xxxxxxx>, Alan Cox <alan@xxxxxxxxxxxxxxxxxxx>, Dan Magenheimer <dan.magenheimer@xxxxxxxxxx>, Ingo Molnar <mingo@xxxxxxx>, Steven Rostedt <rostedt@xxxxxxxxxxx>, George Dunlap <george.dunlap@xxxxxxxxxxxxx>, David Miller <davem@xxxxxxxxxxxxx>, jeremy@xxxxxxxx, avi@xxxxxxxxxx, xen-devel@xxxxxxxxxxxxxxxxxxx, x86@xxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, Keir Fraser <Keir.Fraser@xxxxxxxxxxxxx>, torvalds@xxxxxxxxxxxxxxxxxxxx, gregkh@xxxxxxx, kurt.hackel@xxxxxxxxxx, Ian Pratt <Ian.Pratt@xxxxxxxxxxxxx>, xen-users@xxxxxxxxxxxxxxxxxxx, ksrinivasan <ksrinivasan@xxxxxxxxxx>, EAnderson@xxxxxxxxxx, wimcoekaerts@xxxxxxxxxxxx, Stephen Spector <stephen.spector@xxxxxxxxxx>, jens.axboe@xxxxxxxxxx, npiggin@xxxxxxx |
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Subject: |
[Xen-users] Re: Merge Xen (the hypervisor) into Linux |
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From: |
Gerd Hoffmann <kraxel@xxxxxxxxxx> |
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Date: |
2009年6月03日 13:41:58 +0200 |
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2009年6月04日 02:07:10 -0700 |
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On 06/03/09 13:15, Theodore Tso wrote:
On Wed, Jun 03, 2009 at 11:09:39AM +0200, Gerd Hoffmann wrote:
It wasn't my intention to imply that. The interface can be extended
when needed. PAT support will probably be such a case. Changing it in
incompatible ways isn't going to work though.
But that means that if there is some fundamentally broken piece of
dom0 design, that the Linux kernel will be stuck with it ***forever***
and it will contaminate code paths and make the code harder to
maintain ***forever*** if we consent to the Xen merge?
No. Xen is stuck with it forever (or at least for a few releases).
Even when adding new & better dom0/xen interfaces in the merge process
Xen has to keep the old ones to handle the other dom0 guests (NetBSD,
Solaris, old 2.6.18 out-of-tree linux kernel). Pretty much like the
linux kernel has to keep old syscalls to not break the ABI for the
applications, xen has to maintain old hypercalls[1].
Other way around: Apps can use new system calls only when running one
recent kernels, and they have to deal with -ENOSYS. Likewise it might
be that the pv_ops-based dom0 kernel can provide some features only when
running on a recent hypervisor. That will likely be the case for PAT.
cheers,
Gerd
[1] and other interfaces like trap'n'emulate certain instructions.
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- [Xen-users] Re: Merge Xen (the hypervisor) into Linux, (continued)
- [Xen-users] Re: Merge Xen (the hypervisor) into Linux , Gerd Hoffmann
- [Xen-users] Re: Merge Xen (the hypervisor) into Linux , Alan Cox
- [Xen-users] Re: Merge Xen (the hypervisor) into Linux , Gerd Hoffmann
- [Xen-users] Re: Merge Xen (the hypervisor) into Linux , Keir Fraser
- [Xen-users] Re: Merge Xen (the hypervisor) into Linux , Theodore Tso
- [Xen-users] Re: Merge Xen (the hypervisor) into Linux , Keir Fraser
- [Xen-users] Re: Merge Xen (the hypervisor) into Linux,
Gerd Hoffmann <=
- [Xen-users] Re: Merge Xen (the hypervisor) into Linux , Chris Friesen
- [Xen-users] Re: Merge Xen (the hypervisor) into Linux , Alan Cox
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