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
next prev 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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