From mboxrd@z Thu Jan  1 00:00:00 1970
From: Wei Liu <wei.liu2@citrix.com>
Subject: Re: [PATCH RFC] xen/libxl/libxl: RIP PV superpage.
Date: Mon, 1 Feb 2016 10:37:52 +0000
Message-ID: <20160201103752.GO25660@citrix.com>
References: <1454081446-9753-1-git-send-email-konrad.wilk@oracle.com>
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To: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Cc: Wei Liu <wei.liu2@citrix.com>, Ian Campbell <ian.campbell@citrix.com>, Stefano Stabellini <stefano.stabellini@eu.citrix.com>, Andrew Cooper <andrew.cooper3@citrix.com>, Ian Jackson <ian.jackson@eu.citrix.com>, xen-devel@lists.xen.org, Jan Beulich <jbeulich@suse.com>, Keir Fraser <keir@xen.org>
List-Id: xen-devel@lists.xenproject.org

You have two "libxl" in subject line.

On Fri, Jan 29, 2016 at 10:30:46AM -0500, Konrad Rzeszutek Wilk wrote:
> The last bastion of users is moving away from needing
> this.
> 
> Please note that there was an partial removal by
> c/s 9b3c6b13e0c085ceb53210f8e682a073096b94fa
> "libxc: remove superpages option for pv domains" so an user
> could not even run PV guests with superpage.
> 
> HVM guests are not affected - they have been able to use
> superpages (called hugepages) if the CPU supports 2MB or 1GB
> since Xen 3.3.
> 
> This is reported in the ring buffer:
> (XEN) HVM: HAP page sizes: 4kB, 2MB, 1GB
> 
> AMD CPUs that support 2MB require NPT aka Rapid Virtualization
> Indexing. This was introduced in third generation Opteron -
> Barcelona.
> 
> Intel CPUs that support 2MB require EPT aka Extended Page Tables.
> This was introduced in Westmere microarchitecture.
> 
> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
> ---
>  docs/misc/xen-command-line.markdown |   7 --
>  tools/libxc/include/xenguest.h      |   3 +-
>  tools/libxc/xc_nomigrate.c          |   2 +-
>  tools/libxc/xc_sr_restore.c         |   6 +-
>  tools/libxl/libxl_internal.h        |   2 +-
>  tools/libxl/libxl_save_callout.c    |   4 +-
>  tools/libxl/libxl_save_helper.c     |   3 +-
>  tools/libxl/libxl_stream_read.c     |   2 +-

Changes to toolstack code are done only to internal functions and only
delete the extra argument for superpage flag. They look sensible.

Wei.