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From: Razvan Cojocaru <rzvncj@gmail.com>
To: Ian Campbell <Ian.Campbell@citrix.com>
Cc: "Tim (Xen.org)" <tim@xen.org>,
	"xen-devel@lists.xen.org" <xen-devel@lists.xen.org>
Subject: Re: [PATCH] libxc: Add xc_domain_hvm_get_mtrr_type() call
Date: Wed, 19 Dec 2012 17:43:09 +0200	[thread overview]
Message-ID: <50D1E08D.6020208@gmail.com> (raw)
In-Reply-To: <1355929247.14620.436.camel@zakaz.uk.xensource.com>

> TBH until someone figures out or explains what overlap actually is I
> don't know if it even needs exporting or taking into account in
> userspace.

http://www.mjmwired.net/kernel/Documentation/mtrr.txt

"Creating overlapping MTRRs:

%echo "base=0xfb000000 size=0x1000000 type=write-combining" >/proc/mtrr
%echo "base=0xfb000000 size=0x1000 type=uncachable" >/proc/mtrr

And the results: cat /proc/mtrr
reg00: base=0x00000000 (   0MB), size=  64MB: write-back, count=1
reg01: base=0xfb000000 (4016MB), size=  16MB: write-combining, count=1
reg02: base=0xfb000000 (4016MB), size=   4kB: uncachable, count=1"

Overlapped MTRRs are MTRRs with the same base, but different types of 
addresses at different offsets.

At least to my understanding.

Thanks,
Razvan Cojocaru

  parent reply	other threads:[~2012-12-19 15:43 UTC|newest]

Thread overview: 22+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2012-12-17 11:38 [PATCH] libxc: Add xc_domain_hvm_get_mtrr_type() call Razvan Cojocaru
2012-12-18 17:04 ` Ian Campbell
2012-12-18 17:24   ` Razvan Cojocaru
2012-12-19 10:14     ` Ian Campbell
2012-12-19 10:42       ` Razvan Cojocaru
2012-12-19 11:28         ` Ian Campbell
2012-12-19 11:49           ` Razvan Cojocaru
2012-12-19 12:00             ` Razvan Cojocaru
2012-12-19 14:57             ` Razvan Cojocaru
2012-12-19 15:00               ` Ian Campbell
2012-12-19 15:10                 ` Razvan Cojocaru
2012-12-19 15:27                 ` Andrew Cooper
2012-12-19 15:54                   ` Ian Campbell
2012-12-19 16:11                     ` Andrew Cooper
2012-12-19 16:15                       ` Ian Campbell
2012-12-19 16:29                         ` Razvan Cojocaru
2012-12-19 17:46                           ` Tim Deegan
2012-12-19 19:35                             ` Razvan Cojocaru
2012-12-20 11:57                               ` Tim Deegan
2012-12-20 13:40                                 ` Razvan Cojocaru
2012-12-19 15:43                 ` Razvan Cojocaru [this message]
2012-12-20 11:54               ` Tim Deegan

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