Re: [PATCH 13/16] SUPPORT.md: Add secondary memory management features

[Andrew Cooper <andrew.cooper3@citrix.com>]

On 13/11/17 15:41, George Dunlap wrote:
> Signed-off-by: George Dunlap <george.dunlap@citrix.com>
> ---
> CC: Ian Jackson <ian.jackson@citrix.com>
> CC: Wei Liu <wei.liu2@citrix.com>
> CC: Andrew Cooper <andrew.cooper3@citrix.com>
> CC: Jan Beulich <jbeulich@suse.com>
> CC: Stefano Stabellini <sstabellini@kernel.org>
> CC: Konrad Wilk <konrad.wilk@oracle.com>
> CC: Tim Deegan <tim@xen.org>
> CC: Tamas K Lengyel <tamas.lengyel@zentific.com>
> ---
>  SUPPORT.md | 31 +++++++++++++++++++++++++++++++
>  1 file changed, 31 insertions(+)
>
> diff --git a/SUPPORT.md b/SUPPORT.md
> index 0f7426593e..3e352198ce 100644
> --- a/SUPPORT.md
> +++ b/SUPPORT.md
> @@ -187,6 +187,37 @@ Export hypervisor coverage data suitable for analysis by gcov or lcov.
>  
>      Status: Supported
>  
> +### Memory Sharing
> +
> +    Status, x86 HVM: Tech Preview
> +    Status, ARM: Tech Preview
> +
> +Allow sharing of identical pages between guests

"Tech Preview" should imply there is any kind of `xl dedup-these-domains
$X $Y` functionality.

The only thing we appears to have an example wrapper around the libxc
interface, which requires the user to nominate individual frames, and
this doesn't qualify as "functionally complete" IMO.

There also doesn't appear to be any ARM support in the slightest. 
mem_sharing_{memop,domctl}() are only implemented for x86.

~Andrew

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