From mboxrd@z Thu Jan  1 00:00:00 1970
From: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Subject: Re: HVMlite ABI specification DRAFT B + implementation
	outline
Date: Wed, 10 Feb 2016 10:14:28 -0500
Message-ID: <56BB53D4.8010405@oracle.com>
References: <56B8E66C.6060605@citrix.com>
	<56B9F69002000078000D012B@prv-mh.provo.novell.com>
	<56BB26B0.2040407@citrix.com>
	<56BB40D302000078000D0899@prv-mh.provo.novell.com>
	<56BB4E80.6070800@citrix.com>
Mime-Version: 1.0
Content-Type: text/plain; charset="windows-1252"; Format="flowed"
Content-Transfer-Encoding: quoted-printable
Return-path: <xen-devel-bounces@lists.xen.org>
Received: from mail6.bemta3.messagelabs.com ([195.245.230.39])
	by lists.xen.org with esmtp (Exim 4.72)
	(envelope-from <boris.ostrovsky@oracle.com>) id 1aTWTX-0006Ty-FM
	for xen-devel@lists.xenproject.org; Wed, 10 Feb 2016 15:14:39 +0000
In-Reply-To: <56BB4E80.6070800@citrix.com>
List-Unsubscribe: <http://lists.xen.org/cgi-bin/mailman/options/xen-devel>,
	<mailto:xen-devel-request@lists.xen.org?subject=unsubscribe>
List-Post: <mailto:xen-devel@lists.xen.org>
List-Help: <mailto:xen-devel-request@lists.xen.org?subject=help>
List-Subscribe: <http://lists.xen.org/cgi-bin/mailman/listinfo/xen-devel>,
	<mailto:xen-devel-request@lists.xen.org?subject=subscribe>
Sender: xen-devel-bounces@lists.xen.org
Errors-To: xen-devel-bounces@lists.xen.org
To: =?UTF-8?Q?Roger_Pau_Monn=c3=a9?= <roger.pau@citrix.com>, Jan Beulich <JBeulich@suse.com>, Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Cc: Wei Liu <wei.liu2@citrix.com>, Stefano Stabellini <stefano.stabellini@eu.citrix.com>, Andrew Cooper <andrew.cooper3@citrix.com>, Tim Deegan <tim@xen.org>, Paul Durrant <paul.durrant@citrix.com>, David Vrabel <david.vrabel@citrix.com>, xen-devel <xen-devel@lists.xenproject.org>, Samuel Thibault <samuel.thibault@ens-lyon.org>
List-Id: xen-devel@lists.xenproject.org

On 02/10/2016 09:51 AM, Roger Pau Monn=E9 wrote:
>
> The detection of local APIC and IO APICs is quite isolated from each
> other, and the failure to find any IO APICs should not prevent local
> APICs from being enabled. Although I don't think there's any hardware
> with this setup, such configuration would be valid from an ACPI point of
> view. I've of course not tested this in any way, so those are only
> observations by a quick look at the code. I cannot speak about Linux.

I believe Linux should be able to handle this as well:
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/tree/arch/x=
86/kernel/acpi/boot.c?id=3Drefs/tags/v4.5-rc3#n1140

I also removed ioapic entries from hvmloader's ACPI builder and the =

(HVM) guest came up with no immediately visible issues.

-boris