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xen-devel
[Xen-devel] Re: [RFC, PATCH 2/24] i386 Vmi config
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To: |
Christoph Hellwig <hch@xxxxxxxxxxxxx>, Zachary Amsden <zach@xxxxxxxxxx>, Linus Torvalds <torvalds@xxxxxxxx>, Linux Kernel Mailing List <linux-kernel@xxxxxxxxxxxxxxx>, Virtualization Mailing List <virtualization@xxxxxxxxxxxxxx>, Xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxx>, Andrew Morton <akpm@xxxxxxxx>, Dan Hecht <dhecht@xxxxxxxxxx>, Dan Arai <arai@xxxxxxxxxx>, Anne Holler <anne@xxxxxxxxxx>, Pratap Subrahmanyam <pratap@xxxxxxxxxx>, Christopher Li <chrisl@xxxxxxxxxx>, Joshua LeVasseur <jtl@xxxxxxxxxx>, Chris Wright <chrisw@xxxxxxxx>, Rik Van Riel <riel@xxxxxxxxxx>, Jyothy Reddy <jreddy@xxxxxxxxxx>, Jack Lo <jlo@xxxxxxxxxx>, Kip Macy <kmacy@xxxxxxxxxxx>, Jan Beulich <jbeulich@xxxxxxxxxx>, Ky Srinivasan <ksrinivasan@xxxxxxxxxx>, Wim Coekaerts <wim.coekaerts@xxxxxxxxxx>, Leendert van Doorn <leendert@xxxxxxxxxxxxxx> |
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Subject: |
[Xen-devel] Re: [RFC, PATCH 2/24] i386 Vmi config |
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From: |
Zachary Amsden <zach@xxxxxxxxxx> |
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Date: |
Tue, 14 Mar 2006 07:55:03 -0800 |
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Wed, 15 Mar 2006 10:10:51 +0000 |
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Christoph Hellwig wrote:
On Mon, Mar 13, 2006 at 10:00:27AM -0800, Zachary Amsden wrote:
Introduce the basic VMI sub-arch configuration dependencies. VMI kernels only
are designed to run on modern hardware platforms. As such, they require a
working APIC, and do not support some legacy functionality, including APM BIOS,
ISA and MCA bus systems, PCI BIOS interfaces, or PnP BIOS (by implication of
dropping ISA support). They also require a P6 series CPU.
That's pretty bad because distributors need another kernel still. At least
a working APIC isn't quite as common today as it should.
It doesn't need to be a fully functional APIC. It just needs to not
have one particular bug - Pentium processor erratum 11AP. There is no
reason that most of these requirements can't be dropped. We used to
have a lot more functionality and legacy support turned off, and we
gradually turned it back on. Turning on the BIOS interfaces will cause
complications for a VMI kernel running in a hypervisor - since it can't
invoke non-virtualized BIOS code. So it does require a bit of
conditional logic, which is pretty easy, but we haven't got around to
doing yet.
Zach
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