From: Jeremy Fitzhardinge <jeremy@goop.org>
To: Andi Kleen <andi@firstfloor.org>
Cc: Ingo Molnar <mingo@elte.hu>,
Xen-devel <xen-devel@lists.xensource.com>,
the arch/x86 maintainers <x86@kernel.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Jesse Barnes <jbarnes@virtuousgeek.org>,
"Eric W. Biederman" <ebiederm@xmission.com>,
"H. Peter Anvin" <hpa@zytor.com>,
Thomas Gleixner <tglx@linutronix.de>,
Linus Torvalds <torvalds@linux-foundation.org>
Subject: Re: [GIT PULL] xen /proc/mtrr implementation
Date: Wed, 20 May 2009 15:49:17 -0700 [thread overview]
Message-ID: <4A1488ED.6080604@goop.org> (raw)
In-Reply-To: <20090520225235.GJ8684@one.firstfloor.org>
Andi Kleen wrote:
> There were drivers at some point that set WC MTRRs on their
> transfer rings, not mmio.
>
To avoid cache pollution effects?
> Maybe these all switched to PAT now, maybe not
>
> It's hard to say because it could be also done from user space.
>
How does userspace do the virtual to physical mapping? If the driver
can't also deal with the extra conversion from physical to machine under
Xen, then it won't have much success either way.
J
WARNING: multiple messages have this Message-ID (diff)
From: Jeremy Fitzhardinge <jeremy@goop.org>
To: Andi Kleen <andi@firstfloor.org>
Cc: Xen-devel <xen-devel@lists.xensource.com>,
the arch/x86 maintainers <x86@kernel.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Jesse Barnes <jbarnes@virtuousgeek.org>,
"Eric W. Biederman" <ebiederm@xmission.com>,
"H. Peter Anvin" <hpa@zytor.com>, Ingo Molnar <mingo@elte.hu>,
Linus Torvalds <torvalds@linux-foundation.org>,
Thomas Gleixner <tglx@linutronix.de>
Subject: Re: [GIT PULL] xen /proc/mtrr implementation
Date: Wed, 20 May 2009 15:49:17 -0700 [thread overview]
Message-ID: <4A1488ED.6080604@goop.org> (raw)
In-Reply-To: <20090520225235.GJ8684@one.firstfloor.org>
Andi Kleen wrote:
> There were drivers at some point that set WC MTRRs on their
> transfer rings, not mmio.
>
To avoid cache pollution effects?
> Maybe these all switched to PAT now, maybe not
>
> It's hard to say because it could be also done from user space.
>
How does userspace do the virtual to physical mapping? If the driver
can't also deal with the extra conversion from physical to machine under
Xen, then it won't have much success either way.
J
next prev parent reply other threads:[~2009-05-20 22:49 UTC|newest]
Thread overview: 73+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-05-12 23:27 [GIT PULL] xen /proc/mtrr implementation Jeremy Fitzhardinge
2009-05-12 23:27 ` [PATCH 1/6] xen: set cpu_callout_mask to make mtrr work Jeremy Fitzhardinge
2009-05-12 23:27 ` [PATCH 2/6] xen mtrr: Use specific cpu_has_foo macros instead of generic cpu_has() Jeremy Fitzhardinge
2009-05-12 23:27 ` [PATCH 3/6] xen mtrr: Use generic_validate_add_page() Jeremy Fitzhardinge
2009-05-12 23:27 ` [PATCH 4/6] xen mtrr: Implement xen_get_free_region() Jeremy Fitzhardinge
2009-05-12 23:27 ` [PATCH 5/6] xen mtrr: Add xen_{get,set}_mtrr() implementations Jeremy Fitzhardinge
2009-05-12 23:27 ` [PATCH 6/6] xen mtrr: Kill some unnecessary includes Jeremy Fitzhardinge
2009-05-13 13:30 ` [GIT PULL] xen /proc/mtrr implementation Ingo Molnar
2009-05-13 13:30 ` Ingo Molnar
2009-05-13 14:39 ` Jeremy Fitzhardinge
2009-05-13 14:39 ` Jeremy Fitzhardinge
2009-05-15 18:27 ` Ingo Molnar
2009-05-15 18:27 ` Ingo Molnar
2009-05-15 20:09 ` Jeremy Fitzhardinge
2009-05-15 20:09 ` Jeremy Fitzhardinge
2009-05-15 23:26 ` Eric W. Biederman
2009-05-15 23:49 ` Jeremy Fitzhardinge
2009-05-15 23:49 ` Jeremy Fitzhardinge
2009-05-16 3:22 ` Jesse Barnes
2009-05-16 3:22 ` Jesse Barnes
2009-05-16 4:26 ` Eric W. Biederman
2009-05-16 18:22 ` Jesse Barnes
2009-05-16 18:22 ` Jesse Barnes
2009-05-18 5:02 ` Jeremy Fitzhardinge
2009-05-18 5:02 ` Jeremy Fitzhardinge
2009-05-18 4:57 ` Jeremy Fitzhardinge
2009-05-18 4:57 ` Jeremy Fitzhardinge
2009-05-18 8:59 ` Ingo Molnar
2009-05-18 8:59 ` Ingo Molnar
2009-05-18 13:17 ` [Xen-devel] " Jan Beulich
2009-05-18 17:51 ` Chris Wright
2009-05-18 18:07 ` Jeremy Fitzhardinge
2009-05-18 18:07 ` Jeremy Fitzhardinge
2009-05-19 9:59 ` Ingo Molnar
2009-05-19 9:59 ` Ingo Molnar
2009-05-19 10:22 ` [Xen-devel] " Jan Beulich
2009-05-19 10:22 ` Jan Beulich
2009-05-19 11:08 ` [Xen-devel] " Ingo Molnar
2009-05-19 11:08 ` Ingo Molnar
2009-05-19 12:04 ` [Xen-devel] " Gerd Hoffmann
2009-05-19 12:04 ` Gerd Hoffmann
2009-05-19 12:26 ` [Xen-devel] " Ingo Molnar
2009-05-19 12:26 ` Ingo Molnar
2009-05-19 12:32 ` [Xen-devel] " Alan Cox
2009-05-19 12:32 ` Alan Cox
2009-05-19 12:37 ` [Xen-devel] " Ingo Molnar
2009-05-19 12:37 ` Ingo Molnar
2009-05-19 13:21 ` [Xen-devel] " Gerd Hoffmann
2009-05-19 13:21 ` Gerd Hoffmann
2009-05-19 13:31 ` [Xen-devel] " Ingo Molnar
2009-05-19 13:31 ` Ingo Molnar
2009-05-19 13:51 ` [Xen-devel] " Gerd Hoffmann
2009-05-19 13:51 ` Gerd Hoffmann
2009-05-19 14:17 ` [Xen-devel] " Ingo Molnar
2009-05-19 14:17 ` Ingo Molnar
2009-05-19 14:55 ` [Xen-devel] " Gerd Hoffmann
2009-05-19 14:55 ` Gerd Hoffmann
2009-05-19 15:24 ` [Xen-devel] " Ingo Molnar
2009-05-19 15:24 ` Ingo Molnar
2009-05-20 8:01 ` [Xen-devel] " Gerd Hoffmann
2009-05-20 8:01 ` Gerd Hoffmann
2009-05-20 16:35 ` [Xen-devel] " Jeremy Fitzhardinge
2009-05-20 16:35 ` Jeremy Fitzhardinge
2009-05-20 16:12 ` Jeremy Fitzhardinge
2009-05-20 16:12 ` Jeremy Fitzhardinge
2009-05-20 8:16 ` Andi Kleen
2009-05-20 16:39 ` Jeremy Fitzhardinge
2009-05-20 16:39 ` Jeremy Fitzhardinge
2009-05-20 22:52 ` Andi Kleen
2009-05-20 22:49 ` Jeremy Fitzhardinge [this message]
2009-05-20 22:49 ` Jeremy Fitzhardinge
2009-05-20 23:03 ` H. Peter Anvin
2009-05-20 23:03 ` H. Peter Anvin
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