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From: Wei Liu <wei.liu2@citrix.com>
To: Paul Durrant <paul.durrant@citrix.com>
Cc: Wei Liu <wei.liu2@citrix.com>, Keir Fraser <keir@xen.org>,
	Stefano Stabellini <stefano.stabellini@eu.citrix.com>,
	Andrew Cooper <andrew.cooper3@citrix.com>,
	Ian Jackson <ian.jackson@eu.citrix.com>,
	Jan Beulich <jbeulich@suse.com>,
	xen-devel@lists.xenproject.org
Subject: Re: [PATCH v6] x86/hvm/viridian: Enable APIC assist enlightenment
Date: Fri, 18 Mar 2016 12:30:25 +0000	[thread overview]
Message-ID: <20160318123025.GH28955@citrix.com> (raw)
In-Reply-To: <1458297150-1574-1-git-send-email-paul.durrant@citrix.com>

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@citrix.com>
> Cc: Ian Jackson <ian.jackson@eu.citrix.com>
> Cc: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
> Cc: Wei Liu <wei.liu2@citrix.com>
> Cc: Keir Fraser <keir@xen.org>
> Cc: Jan Beulich <jbeulich@suse.com>
> Cc: Andrew Cooper <andrew.cooper3@citrix.com>
> ---
> 
> 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@citrix.com>


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  parent reply	other threads:[~2016-03-18 12:29 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-03-18 10:32 Paul Durrant
2016-03-18 11:05 ` Jan Beulich
2016-03-18 12:30 ` Wei Liu [this message]
2016-03-24 13:50 ` Jan Beulich
2016-03-24 13:56   ` Paul Durrant

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