From mboxrd@z Thu Jan 1 00:00:00 1970 From: Marcelo Tosatti Subject: Re: [PATCH/RFC] KVM: Plan obsolescence of kernel allocated slots, paravirt mmu Date: Wed, 27 Jan 2010 15:23:36 -0200 Message-ID: <20100127172336.GA5807@amt.cnet> References: <1264516474-11575-1-git-send-email-avi@redhat.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: kvm@vger.kernel.org To: Avi Kivity Return-path: Received: from mx1.redhat.com ([209.132.183.28]:18522 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755353Ab0A0Rud (ORCPT ); Wed, 27 Jan 2010 12:50:33 -0500 Received: from int-mx04.intmail.prod.int.phx2.redhat.com (int-mx04.intmail.prod.int.phx2.redhat.com [10.5.11.17]) by mx1.redhat.com (8.13.8/8.13.8) with ESMTP id o0RHoW1L004204 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=OK) for ; Wed, 27 Jan 2010 12:50:33 -0500 Content-Disposition: inline In-Reply-To: <1264516474-11575-1-git-send-email-avi@redhat.com> Sender: kvm-owner@vger.kernel.org List-ID: On Tue, Jan 26, 2010 at 04:34:34PM +0200, Avi Kivity wrote: > These features are unused by modern userspace and can go away. Paravirt > mmu needs to stay a little longer for live migration. > > Signed-off-by: Avi Kivity > --- > Documentation/feature-removal-schedule.txt | 23 +++++++++++++++++++++++ > 1 files changed, 23 insertions(+), 0 deletions(-) > > diff --git a/Documentation/feature-removal-schedule.txt b/Documentation/feature-removal-schedule.txt > index 870d190..88ca110 100644 > --- a/Documentation/feature-removal-schedule.txt > +++ b/Documentation/feature-removal-schedule.txt > @@ -493,3 +493,26 @@ Why: These two features use non-standard interfaces. There are the > Who: Corentin Chary > > ---------------------------- > +What: KVM memory aliases support > +When: July 2010 > +Why: Memory aliasing support is used for speeding up guest vga access > + through the vga windows. > + > + Modern userspace no longer uses this feature, so it's just bitrotted > + code and can be removed with no impact. > +Who: Avi Kivity > +---------------------------- > +What: KVM kernel-allocated memory slots > +When: July 2010 > +Why: Since 2.6.25, kvm supports user-allocated memory slots, which are > + much more flexible than kernel-allocated slots. All current userspace > + supports the newer interface and this code can be removed with no > + impact. Just a note: can block userspace usage but can't really remove code since there are in-kernel users (special purpose vmx pages). Otherwise looks good to me. > +Who: Avi Kivity > +---------------------------- > +What: KVM paravirt mmu host support > +When: January 2011 > +Why: The paravirt mmu host support is slower than non-paravirt mmu, both > + on newer and older hardware. It is already not exposed to the guest, > + and kept only for live migration purposes. > +Who: Avi Kivity > -- > 1.6.5.3 > > -- > To unsubscribe from this list: send the line "unsubscribe kvm" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html