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xen-devel
[Xen-devel] Re: [GIT PULL] xen /proc/mtrr implementation
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To: |
Jeremy Fitzhardinge <jeremy@xxxxxxxx> |
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Subject: |
[Xen-devel] Re: [GIT PULL] xen /proc/mtrr implementation |
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From: |
Andi Kleen <andi@xxxxxxxxxxxxxx> |
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Date: |
Thu, 21 May 2009 00:52:35 +0200 |
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Cc: |
Xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxx>, the arch/x86 maintainers <x86@xxxxxxxxxx>, Linux Kernel Mailing List <linux-kernel@xxxxxxxxxxxxxxx>, Jesse Barnes <jbarnes@xxxxxxxxxxxxxxxx>, Andi Kleen <andi@xxxxxxxxxxxxxx>, "Eric W. Biederman" <ebiederm@xxxxxxxxxxxx>, "H. Peter Anvin" <hpa@xxxxxxxxx>, Ingo Molnar <mingo@xxxxxxx>, Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>, Thomas Gleixner <tglx@xxxxxxxxxxxxx> |
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Thu, 21 May 2009 08:15:03 -0700 |
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Mutt/1.4.2.1i |
> >Is this new interface only defined for swiotlb or MMIO mappings?
> >If yes did you check the drivers only actually set it on
> >swiotlb or MMIO (that seems dubious to me)?
>
> Really? Do we ever set unusual memory types on normal system memory?
There were drivers at some point that set WC MTRRs on their
transfer rings, not mmio.
Maybe these all switched to PAT now, maybe not
It's hard to say because it could be also done from user space.
-Andi
--
ak@xxxxxxxxxxxxxxx -- Speaking for myself only.
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