Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754808AbZLVTPu (ORCPT ); Tue, 22 Dec 2009 14:15:50 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1754669AbZLVTPt (ORCPT ); Tue, 22 Dec 2009 14:15:49 -0500 Received: from mail-qy0-f192.google.com ([209.85.221.192]:51447 "EHLO mail-qy0-f192.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754428AbZLVTPs (ORCPT ); Tue, 22 Dec 2009 14:15:48 -0500 DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=message-id:date:from:user-agent:mime-version:to:cc:subject :references:in-reply-to:x-enigmail-version:content-type; b=uXSKirz4QXgmV7TRXsyuwZ8m+BCFeRt4zd5Q24ybbqpbbW1a6nZEBWFyfbUapOYe81 GkqMpb3Z6Z93EY2GWTRrAwGLXkyRMOpEcxRV4ioMYIYQcygMFcCOnWKoufeo/F+liEju ikSxAUFGYojutHZ68sXf/in79HH71VdC6vOa0= Message-ID: <4B311ADA.4000700@gmail.com> Date: Tue, 22 Dec 2009 14:15:38 -0500 From: Gregory Haskins User-Agent: Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.6; en-US; rv:1.9.1.5) Gecko/20091204 Thunderbird/3.0 MIME-Version: 1.0 To: Avi Kivity CC: Ingo Molnar , kvm@vger.kernel.org, Andrew Morton , torvalds@linux-foundation.org, "linux-kernel@vger.kernel.org" , netdev@vger.kernel.org, "alacrityvm-devel@lists.sourceforge.net" Subject: Re: [GIT PULL] AlacrityVM guest drivers for 2.6.33 References: <4B1D4F29.8020309@gmail.com> <20091218215107.GA14946@elte.hu> <4B2F9582.5000002@gmail.com> <20091222075742.GB26467@elte.hu> <4B3103B4.4070708@gmail.com> <4B3115C1.4070303@redhat.com> In-Reply-To: <4B3115C1.4070303@redhat.com> X-Enigmail-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="------------enig8A6C4C5A6F8543D443E2BFB9" Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1858 Lines: 52 This is an OpenPGP/MIME signed message (RFC 2440 and 3156) --------------enig8A6C4C5A6F8543D443E2BFB9 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable On 12/22/09 1:53 PM, Avi Kivity wrote: > I asked why the irqfd/ioeventfd mechanisms are insufficient, and you di= d not reply. >=20 BTW: the ioeventfd issue just fell through the cracks, so sorry about that. Note that I have no specific issue with irqfd ever since the lockless IRQ injection code was added. ioeventfd turned out to be suboptimal for me in the fast path for two reasons: 1) the underlying eventfd is called in atomic context. I had posted patches to Davide to address that limitation, but I believe he rejected them on the grounds that they are only relevant to KVM. 2) it cannot retain the data field passed in the PIO. I wanted to have one vector that could tell me what value was written, and this cannot be expressed in ioeventfd. Based on this, it was a better decision to add a ioevent interface to xinterface. It neatly solves both problems. Kind Regards, -Greg --------------enig8A6C4C5A6F8543D443E2BFB9 Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- Version: GnuPG/MacGPG2 v2.0.11 (Darwin) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/ iEYEARECAAYFAksxGtoACgkQP5K2CMvXmqHYNwCeKP6FucL9dVcuOFWM/WV1rAdR gZYAn14u1/O/su3G+m1jvb1lTa8lCXN+ =ydvF -----END PGP SIGNATURE----- --------------enig8A6C4C5A6F8543D443E2BFB9-- -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/