From: "H. Peter Anvin" <hpa@zytor.com>
To: Jeremy Fitzhardinge <jeremy@goop.org>
Cc: Andi Kleen <andi@firstfloor.org>,
Andrew Morton <akpm@linux-foundation.org>,
Xen-devel <xen-devel@lists.xensource.com>,
the arch/x86 maintainers <x86@kernel.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH] xen: core dom0 support
Date: Sun, 01 Mar 2009 16:46:48 -0800 [thread overview]
Message-ID: <49AB2C78.9010401@zytor.com> (raw)
In-Reply-To: <49AB2B7B.2000103@goop.org>
Jeremy Fitzhardinge wrote:
>>
>> What do you define as "full PAT"? If what you mean is that Xen lays
>> claims to the PAT MSR and only allows a certain mapping that's hardly
>> a problem... other than that it's not an exhaustible resource so I
>> guess I really don't understand what you're trying to say here.
>
> It does not allow guests to set their own PAT MSRs. It can't easily be
> multiplexed either, as all CPUs must have the same settings for their
> PAT MSRs. I guess it could be handled by allowing domains to set their
> own virtual PAT MSRs, and then rewriting the ptes to convert from the
> guest PAT settings to Xen's, but I don't know if this is possible in
> general (and it poses some problems because the pte modifications would
> be guest-visible).
>
It would make a lot more sense to simply specify a particular set of
mappings. Since the only one anyone cares about that isn't in the
default set is WC anyway, it's easy to do.
-hpa
--
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel. I don't speak on their behalf.
next prev parent reply other threads:[~2009-03-02 0:50 UTC|newest]
Thread overview: 77+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-02-28 1:59 [PATCH] xen: core dom0 support Jeremy Fitzhardinge
2009-02-28 1:59 ` [PATCH] xen dom0: Make hvc_xen console work for dom0 Jeremy Fitzhardinge
2009-02-28 1:59 ` [PATCH] xen dom0: Initialize xenbus " Jeremy Fitzhardinge
2009-02-28 1:59 ` [PATCH] xen dom0: Set up basic IO permissions " Jeremy Fitzhardinge
2009-02-28 1:59 ` [PATCH] xen-dom0: only selectively disable cpu features Jeremy Fitzhardinge
2009-02-28 1:59 ` [PATCH] xen dom0: Add support for the platform_ops hypercall Jeremy Fitzhardinge
2009-02-28 1:59 ` [PATCH] xen mtrr: Add mtrr_ops support for Xen mtrr Jeremy Fitzhardinge
2009-02-28 1:59 ` [PATCH] xen: disable PAT Jeremy Fitzhardinge
2009-02-28 1:59 ` [PATCH] xen/dom0: use _PAGE_IOMAP in ioremap to do machine mappings Jeremy Fitzhardinge
2009-02-28 1:59 ` [PATCH] paravirt/xen: add pvop for page_is_ram Jeremy Fitzhardinge
2009-03-10 1:07 ` H. Peter Anvin
2009-03-10 21:19 ` Jeremy Fitzhardinge
2009-03-10 22:21 ` H. Peter Anvin
2009-03-10 22:44 ` Jeremy Fitzhardinge
2009-02-28 1:59 ` [PATCH] xen/dom0: Use host E820 map Jeremy Fitzhardinge
2009-02-28 1:59 ` [PATCH] xen: implement XENMEM_machphys_mapping Jeremy Fitzhardinge
2009-02-28 1:59 ` [PATCH] xen: clear reserved bits in l3 entries given in the initial pagetables Jeremy Fitzhardinge
2009-02-28 1:59 ` [PATCH] xen/dom0: add XEN_DOM0 config option Jeremy Fitzhardinge
2009-02-28 1:59 ` [PATCH] xen: allow enable use of VGA console on dom0 Jeremy Fitzhardinge
2009-02-28 1:59 ` [PATCH] xen mtrr: Use specific cpu_has_foo macros instead of generic cpu_has() Jeremy Fitzhardinge
2009-02-28 1:59 ` [PATCH] xen mtrr: Kill some unneccessary includes Jeremy Fitzhardinge
2009-02-28 1:59 ` [PATCH] xen mtrr: Use generic_validate_add_page() Jeremy Fitzhardinge
2009-02-28 1:59 ` [PATCH] xen mtrr: Implement xen_get_free_region() Jeremy Fitzhardinge
2009-02-28 1:59 ` [PATCH] xen mtrr: Add xen_{get,set}_mtrr() implementations Jeremy Fitzhardinge
2009-02-28 5:28 ` [PATCH] xen: core dom0 support Andrew Morton
2009-02-28 6:52 ` Jeremy Fitzhardinge
2009-02-28 7:20 ` Ingo Molnar
2009-02-28 8:05 ` Jeremy Fitzhardinge
2009-02-28 8:36 ` Ingo Molnar
2009-02-28 9:57 ` Jeremy Fitzhardinge
2009-03-02 9:26 ` Gerd Hoffmann
2009-03-02 12:04 ` Ingo Molnar
2009-03-02 12:26 ` Gerd Hoffmann
2009-02-28 12:09 ` Nick Piggin
2009-02-28 18:11 ` [Xen-devel] " Jody Belka
2009-02-28 18:15 ` Andi Kleen
2009-03-01 23:38 ` Jeremy Fitzhardinge
2009-03-02 0:14 ` Andi Kleen
2009-03-01 23:27 ` Jeremy Fitzhardinge
2009-03-02 6:37 ` Nick Piggin
2009-03-02 8:05 ` Jeremy Fitzhardinge
2009-03-02 8:19 ` Nick Piggin
2009-03-02 9:05 ` Jeremy Fitzhardinge
2009-03-04 17:34 ` Anthony Liguori
2009-03-04 17:38 ` Jeremy Fitzhardinge
2009-03-05 10:59 ` [Xen-devel] " George Dunlap
2009-03-05 14:37 ` Anthony Liguori
2009-03-04 17:31 ` Anthony Liguori
2009-03-04 19:03 ` Anthony Liguori
2009-03-04 19:16 ` H. Peter Anvin
2009-03-04 19:33 ` Anthony Liguori
2009-02-28 16:14 ` Andi Kleen
2009-03-01 23:34 ` Jeremy Fitzhardinge
2009-03-01 23:52 ` H. Peter Anvin
2009-03-02 0:08 ` Jeremy Fitzhardinge
2009-03-02 0:14 ` H. Peter Anvin
2009-03-02 0:42 ` Jeremy Fitzhardinge
2009-03-02 0:46 ` H. Peter Anvin [this message]
2009-03-02 0:10 ` Andi Kleen
2009-02-28 8:42 ` Ingo Molnar
2009-02-28 9:46 ` Jeremy Fitzhardinge
2009-03-02 12:08 ` Ingo Molnar
2009-03-07 9:06 ` Jeremy Fitzhardinge
2009-03-08 11:01 ` Ingo Molnar
2009-03-08 21:56 ` H. Peter Anvin
2009-03-08 22:06 ` Ingo Molnar
2009-03-08 22:08 ` H. Peter Anvin
2009-03-08 22:12 ` Ingo Molnar
2009-03-09 18:06 ` Jeremy Fitzhardinge
2009-03-10 12:44 ` Ingo Molnar
2009-03-10 12:49 ` Nick Piggin
2009-03-05 13:52 ` Morten P.D. Stevens
2009-03-08 14:25 ` Manfred Knick
2009-03-09 19:51 ` Morten P.D. Stevens
2009-03-09 20:00 ` Morten P.D. Stevens
-- strict thread matches above, loose matches on Subject: below --
2009-03-11 19:58 devzero
2009-03-14 1:08 ` Morten P.D. Stevens
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=49AB2C78.9010401@zytor.com \
--to=hpa@zytor.com \
--cc=akpm@linux-foundation.org \
--cc=andi@firstfloor.org \
--cc=jeremy@goop.org \
--cc=linux-kernel@vger.kernel.org \
--cc=x86@kernel.org \
--cc=xen-devel@lists.xensource.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).