From mboxrd@z Thu Jan 1 00:00:00 1970 From: Gregory Haskins Subject: Re: [RFC PATCH 0/3] generic hypercall support Date: Thu, 07 May 2009 14:08:16 -0400 Message-ID: <4A032390.6030100@gmail.com> References: <20090505132005.19891.78436.stgit@dev.haskins.net> <4A0040C0.1080102@redhat.com> <4A0041BA.6060106@novell.com> <4A004676.4050604@redhat.com> <4A0049CD.3080003@gmail.com> <20090505231718.GT3036@sequoia.sous-sol.org> <4A010927.6020207@novell.com> <20090506072212.GV3036@sequoia.sous-sol.org> <4A018DF2.6010301@novell.com> <20090506160712.GW3036@sequoia.sous-sol.org> <4A031471.7000406@novell.com> <4A0322F1.2000905@redhat.com> Mime-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="------------enig272D50D3E1F2F5EBA341A444" Cc: Gregory Haskins , Chris Wright , linux-kernel@vger.kernel.org, kvm@vger.kernel.org, Anthony Liguori To: Avi Kivity Return-path: In-Reply-To: <4A0322F1.2000905@redhat.com> Sender: linux-kernel-owner@vger.kernel.org List-Id: kvm.vger.kernel.org This is an OpenPGP/MIME signed message (RFC 2440 and 3156) --------------enig272D50D3E1F2F5EBA341A444 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Avi Kivity wrote: > Gregory Haskins wrote: >> I completed the resurrection of the test and wrote up a little wiki on= >> the subject, which you can find here: >> >> http://developer.novell.com/wiki/index.php/WhyHypercalls >> >> Hopefully this answers Chris' "show me the numbers" and Anthony's "Why= >> reinvent the wheel?" questions. >> >> I will include this information when I publish the updated v2 series >> with the s/hypercall/dynhc changes. >> >> Let me know if you have any questions. >> =20 > > Well, 420 ns is not to be sneezed at. > > What do you think of my mmio hypercall? That will speed up all mmio > to be as fast as a hypercall, and then we can use ordinary mmio/pio > writes to trigger things. > I like it! Bigger question is what kind of work goes into making mmio a pv_op (or is this already done)? -Greg --------------enig272D50D3E1F2F5EBA341A444 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 iEYEARECAAYFAkoDI5AACgkQP5K2CMvXmqEtAQCgiix+E5XsSPkq4Q4xlQLpzpHK iS8AnAhM+RHQKsDJS6ElNsEhFBZEJG5n =6vsg -----END PGP SIGNATURE----- --------------enig272D50D3E1F2F5EBA341A444--