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xen-devel
[Xen-devel] Re: [GIT PULL] xen /proc/mtrr implementation
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To: |
Andi Kleen <andi@xxxxxxxxxxxxxx> |
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Subject: |
[Xen-devel] Re: [GIT PULL] xen /proc/mtrr implementation |
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From: |
Jeremy Fitzhardinge <jeremy@xxxxxxxx> |
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Date: |
Wed, 20 May 2009 15:49:17 -0700 |
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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>, "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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Wed, 20 May 2009 15:50:12 -0700 |
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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
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