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From: Jeremy Fitzhardinge <jeremy@goop.org>
To: Christoph Lameter <clameter@sgi.com>
Cc: Andi Kleen <ak@muc.de>, Andrew Morton <akpm@linux-foundation.org>,
	linux-kernel@vger.kernel.org, virtualization@lists.osdl.org,
	xen-devel@lists.xensource.com, Chris Wright <chrisw@sous-sol.org>,
	Zachary Amsden <zach@vmware.com>
Subject: Re: [patch 00/21] Xen-paravirt: Xen guest implementation for paravirt_ops interface
Date: Fri, 16 Feb 2007 15:49:32 -0800	[thread overview]
Message-ID: <45D6430C.4030403@goop.org> (raw)
In-Reply-To: <Pine.LNX.4.64.0702161244380.26718@schroedinger.engr.sgi.com>

Christoph Lameter wrote:
> I am thoroughly confused. Maybe that is because I have not been following 
> this issue closely but it seems that you are using the paravirt interface 
> as an API for Xen code in the guest? I thought the idea of paravirt was to 
> have an API that is generic? This patchset seems to be mostly realizing 
> Xen specific functionality? How does the code here interact with KVM, 
> VMWare and other hypervisors?

There are two things in this patch series: generic kernel changes, and
the core bits of Xen itself.

The earlier part of the patch contains changes to the core kernel which
are needed for Xen, but are generally harmless to non-paravirt use, or
to being virtualized under other hypervisors.   In some cases these are
plain bugfixes (like dealing with absent vga hardware), or things which
have become parameterised (like the pgd alignment, or whether we share
the kernel pmd in PAE mode).

But there are also extensions to the paravirt_ops interface.  The
largest of these is adding the appropriate hooks for
non-shadowed-pagetable hypervisors.  While Xen is the only example of
this at the moment, its not a Xen-specific set of hooks.  It allows a
hypervisor backend to have detailed control over what actually gets put
into pagetables; in Xen's case this means we can convert the kernel's
pseudo-physical addresses into machine addresses, but you could imagine
a hypervisor maintaining some other structure in parallel with the
pagetable or something like that.  An analogy would be extending the IO
DMA interfaces to account for an IOMMU, even if only one hardware
platform actually has an IOMMU.

The latter part of the series is basically pure Xen-specifc stuff, which
is almost entirely restricted to Xen-specific parts of the tree.  This
code introduces a number of new Xen-specific interfaces, but they're
completely distinct from paravirt_ops.

    J

  parent reply	other threads:[~2007-02-16 23:49 UTC|newest]

Thread overview: 97+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-02-16  2:24 Jeremy Fitzhardinge
2007-02-16  2:24 ` [patch 01/21] Xen-paravirt: Fix typo in sync_constant_test_bit()s name Jeremy Fitzhardinge
2007-02-16  2:24 ` [patch 02/21] Xen-paravirt: ignore vgacon if hardware not present Jeremy Fitzhardinge
2007-02-16  2:24 ` [patch 03/21] Xen-paravirt: Add pagetable accessors to pack and unpack pagetable entries Jeremy Fitzhardinge
2007-02-16  2:24 ` [patch 04/21] Xen-paravirt: =================================================================== Jeremy Fitzhardinge
2007-02-16  9:12   ` Andi Kleen
2007-02-16 17:32     ` Jeremy Fitzhardinge
2007-02-16  2:24 ` [patch 05/21] Xen-paravirt: paravirt_ops: hooks to set up initial pagetable Jeremy Fitzhardinge
2007-02-16  2:24 ` [patch 06/21] Xen-paravirt: paravirt_ops: allocate a fixmap slot Jeremy Fitzhardinge
2007-02-16  2:24 ` [patch 07/21] Xen-paravirt: remove ctor for pgd cache Jeremy Fitzhardinge
2007-02-16  6:04   ` Zachary Amsden
2007-02-16  8:39   ` Pekka Enberg
2007-02-16  9:19     ` Nick Piggin
2007-02-16 17:19       ` Jeremy Fitzhardinge
2007-02-16 20:33   ` Christoph Lameter
2007-02-16 23:33     ` Jeremy Fitzhardinge
2007-02-16  2:24 ` [patch 08/21] Xen-paravirt: Allow paravirt backend to choose kernel PMD sharing Jeremy Fitzhardinge
2007-02-16  2:24 ` [patch 09/21] Xen-paravirt: Allow paravirt backend to select PGD allocation alignment Jeremy Fitzhardinge
2007-02-16  2:24 ` [patch 10/21] Xen-paravirt: add hooks to intercept mm creation and destruction Jeremy Fitzhardinge
2007-02-16  6:34   ` Andrew Morton
2007-02-16  6:55     ` Jeremy Fitzhardinge
2007-02-22 20:16   ` Pavel Machek
2007-02-22 20:21     ` Jeremy Fitzhardinge
2007-02-22 20:23     ` Jeremy Fitzhardinge
2007-02-16  2:25 ` [patch 11/21] Xen-paravirt: Add apply_to_page_range() which applies a function to a pte range Jeremy Fitzhardinge
2007-02-16  6:37   ` Andrew Morton
2007-02-16  7:06     ` Jeremy Fitzhardinge
2007-02-16  7:19       ` Andrew Morton
2007-02-16  7:23         ` Jeremy Fitzhardinge
2007-02-16  7:31     ` Nick Piggin
2007-02-16  2:25 ` [patch 12/21] Xen-paravirt: Allocate and free vmalloc areas Jeremy Fitzhardinge
2007-02-16  6:43   ` Andrew Morton
2007-02-16  7:08     ` Jeremy Fitzhardinge
2007-02-16  7:24       ` Andrew Morton
2007-02-16  7:30         ` Jeremy Fitzhardinge
2007-02-16  7:49           ` Andrew Morton
2007-02-16  9:18           ` Andi Kleen
2007-02-16 11:10             ` [Xen-devel] " Keir Fraser
2007-02-16 11:34               ` Andi Kleen
2007-02-16 16:46             ` Jeremy Fitzhardinge
2007-02-16 17:10               ` [Xen-devel] " Keir Fraser
2007-02-16 17:12                 ` Keir Fraser
2007-02-16 17:27                   ` Jeremy Fitzhardinge
2007-02-16 19:06                     ` Keir Fraser
2007-02-16 19:19                       ` Keir Fraser
2007-02-16 19:26                         ` Jeremy Fitzhardinge
2007-02-16 23:29                           ` Keir Fraser
2007-02-16 23:41                             ` Jeremy Fitzhardinge
2007-02-16 17:26                 ` Hollis Blanchard
2007-02-16  7:48         ` Nick Piggin
2007-02-16  2:25 ` [patch 13/21] Xen-paravirt: Add nosegneg capability to the vsyscall page notes Jeremy Fitzhardinge
2007-02-16  6:06   ` Zachary Amsden
2007-02-16  2:25 ` [patch 14/21] Xen-paravirt: Add XEN config options and disable unsupported config options Jeremy Fitzhardinge
2007-02-16  6:14   ` Dan Hecht
2007-02-16  7:04     ` Jeremy Fitzhardinge
2007-02-16  7:52       ` Dan Hecht
2007-02-16  8:05         ` Jeremy Fitzhardinge
2007-02-16  8:37           ` Dan Hecht
2007-02-16 10:49             ` Keir Fraser
2007-02-16  7:06     ` Andrew Morton
2007-02-16  7:25       ` Jeremy Fitzhardinge
2007-02-16 10:09         ` Keir Fraser
2007-02-16 10:19           ` [Xen-devel] " Zachary Amsden
2007-02-16 10:44             ` Keir Fraser
2007-02-16 10:55               ` Zachary Amsden
2007-02-17  4:04             ` Rusty Russell
2007-02-16  6:15   ` Zachary Amsden
2007-02-16  7:33     ` Eric W. Biederman
2007-02-16  8:14       ` Ian Campbell
2007-02-16  8:24         ` Eric W. Biederman
2007-02-16  8:31           ` Zachary Amsden
2007-02-16 13:53       ` [Xen-devel] " Gerd Hoffmann
2007-02-18 11:32     ` Avi Kivity
2007-02-16  2:25 ` [patch 16/21] Xen-paravirt: Core Xen implementation Jeremy Fitzhardinge
2007-02-16  2:25 ` [patch 17/21] Xen-paravirt: Add the Xen virtual console driver Jeremy Fitzhardinge
2007-02-16  6:48   ` Andrew Morton
2007-02-16  2:25 ` [patch 18/21] Xen-paravirt: Add Xen grant table support Jeremy Fitzhardinge
2007-02-16  6:52   ` Andrew Morton
2007-02-16  6:58     ` Jeremy Fitzhardinge
2007-02-16  2:25 ` [patch 19/21] Xen-paravirt: Add the Xenbus sysfs and virtual device hotplug driver Jeremy Fitzhardinge
2007-02-16  2:25 ` [patch 20/21] Xen-paravirt: Add Xen virtual block device driver Jeremy Fitzhardinge
2007-02-16  2:25 ` [patch 21/21] Xen-paravirt: Add the Xen virtual network " Jeremy Fitzhardinge
2007-02-16  6:59 ` [patch 00/21] Xen-paravirt: Xen guest implementation for paravirt_ops interface Andrew Morton
2007-02-16  7:20   ` Jeremy Fitzhardinge
2007-02-16 20:49 ` Christoph Lameter
2007-02-16 21:04   ` Zachary Amsden
2007-02-16 21:13     ` Christoph Lameter
2007-02-16 21:48       ` Zachary Amsden
2007-02-16 21:59         ` Christoph Lameter
2007-02-16 22:10           ` Zachary Amsden
2007-02-17 13:51           ` Andi Kleen
2007-02-21 18:37             ` Christoph Lameter
2007-02-21 18:55               ` Zachary Amsden
2007-02-21 20:02               ` Jeremy Fitzhardinge
2007-02-17  5:05         ` Rusty Russell
2007-02-16 23:49   ` Jeremy Fitzhardinge [this message]
2007-02-17  4:58   ` Rusty Russell

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