Re: [Xen-devel] [PATCH v6] x86/hvm/viridian: Enable APIC assist enlightenment

[Wei Liu <wei.liu2@xxxxxxxxxx>]

On Fri, Mar 18, 2016 at 10:32:30AM +0000, Paul Durrant wrote:
> This patch adds code to enable the APIC assist enlightenment which,
> under certain conditions, means that the guest can avoid an EOI of
> the local APIC and thereby avoid a VMEXIT.
> 
> Use of the enlightenment by the hypervisor is under control of the
> toolstack, and is added to the default set.
> 
> Signed-off-by: Paul Durrant <paul.durrant@xxxxxxxxxx>
> Cc: Ian Jackson <ian.jackson@xxxxxxxxxxxxx>
> Cc: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
> Cc: Wei Liu <wei.liu2@xxxxxxxxxx>
> Cc: Keir Fraser <keir@xxxxxxx>
> Cc: Jan Beulich <jbeulich@xxxxxxxx>
> Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
> ---
> 
> v6:
>  - Addressed various comments from Jan
> 
> v4:
>  - Re-worded xl.cfg text and added missing LIBXL_HAVE_ definition
> 
> v3:
>  - Re-instated read-modify-write for forwards compatibility
>  - Fix a coding style issue
> 
> v2:
>  - Removed some code duplication and unnecessary read-modify-write
>    operations on the APIC assist word.
>  - Stated in the xl.cfg text that the enlightenment has no effect if
>    posted interrupts are in use.
>  - Added the enlightenment to the default set.
> ---
>  docs/man/xl.cfg.pod.5              | 12 +++++++-
>  tools/libxl/libxl.h                |  6 ++++
>  tools/libxl/libxl_dom.c            |  4 +++
>  tools/libxl/libxl_types.idl        |  1 +

Acked-by: Wei Liu <wei.liu2@xxxxxxxxxx>


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