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[23.128.96.18]) by mx.google.com with ESMTP id w18si668294ejk.400.2020.12.02.12.42.48; Wed, 02 Dec 2020 12:43:13 -0800 (PST) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18; Authentication-Results: mx.google.com; dkim=pass header.i=@infradead.org header.s=merlin.20170209 header.b=nxzU1o0M; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728577AbgLBUij (ORCPT + 99 others); Wed, 2 Dec 2020 15:38:39 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:43762 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726162AbgLBUii (ORCPT ); Wed, 2 Dec 2020 15:38:38 -0500 Received: from merlin.infradead.org (merlin.infradead.org [IPv6:2001:8b0:10b:1231::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 8EAB1C0613D6; Wed, 2 Dec 2020 12:37:58 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=merlin.20170209; h=Mime-Version:Content-Type:References: In-Reply-To:Date:Cc:To:From:Subject:Message-ID:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=t+9s/xPDA+Z4vaJU8rrFBtgJojiVbfMkX8OJ+vNs0H0=; b=nxzU1o0MIwRRGEji3k8eaTwEk4 22CjWuOcyo4OUp2HRYek+TguRqa/HAN5jlt9d+UYpx4WEVCSv9d/bfb/MRl3U6sj1r8aLnehSoXrm imm4hj6QuXoyaDAHCm6qeHm7PUPP2/XeLJFoSf7ORKSZws4I7vQZT7GhQCal8rIlbMIrY/NF6bZv6 iIZEZOGDVPOAa7hMvptaj2fZFKV9l6ICnXYw5tVvoLYPGV2DPlsAqN29L/340/WMykUxqgBnYKdQd rkZL8prQ5iu4M/h9eEof6HY6dg4UD6A0j4if2J9+jD5FOCL6WUPv5H5CXnm72lzzdE+liLnfL8kA+ Z8waLGoQ==; Received: from 54-240-197-235.amazon.com ([54.240.197.235] helo=u3832b3a9db3152.ant.amazon.com) by merlin.infradead.org with esmtpsa (Exim 4.92.3 #3 (Red Hat Linux)) id 1kkYsk-0001jV-KE; Wed, 02 Dec 2020 20:37:46 +0000 Message-ID: <775cbd56c192cfb76cee10ee4a2dfdafaeacffa5.camel@infradead.org> Subject: Re: [PATCH RFC 10/39] KVM: x86/xen: support upcall vector From: David Woodhouse To: Joao Martins , Ankur Arora Cc: Boris Ostrovsky , Paolo Bonzini , Radim =?UTF-8?Q?Kr=C4=8Dm=C3=A1=C5=99?= , Thomas Gleixner , Ingo Molnar , Borislav Petkov , "H. Peter Anvin" , x86@kernel.org, kvm@vger.kernel.org, linux-kernel@vger.kernel.org Date: Wed, 02 Dec 2020 20:37:43 +0000 In-Reply-To: <59751932-92c3-5397-0706-13c4e1b38aa5@oracle.com> References: <20190220201609.28290-1-joao.m.martins@oracle.com> <20190220201609.28290-11-joao.m.martins@oracle.com> <71753a370cd6f9dd147427634284073b78679fa6.camel@infradead.org> <53baeaa7-0fed-d22c-7767-09ae885d13a0@oracle.com> <4ad0d157c5c7317a660cd8d65b535d3232f9249d.camel@infradead.org> <052867ae1c997487d85c21e995feb5647ac6c458.camel@infradead.org> <59751932-92c3-5397-0706-13c4e1b38aa5@oracle.com> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/x-pkcs7-signature"; boundary="=-Yz2uI+xnw528HCGFiMOS" X-Mailer: Evolution 3.28.5-0ubuntu0.18.04.2 Mime-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by merlin.infradead.org. See http://www.infradead.org/rpr.html Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org --=-Yz2uI+xnw528HCGFiMOS Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Wed, 2020-12-02 at 20:12 +0000, Joao Martins wrote: > > I'll do some more experiments and > > see what I can get working, and what it looks like. > >=20 > > I'm focusing on making the shinfo stuff all use kvm_map_gfn() first. > >=20 >=20 > I was chatting with Ankur, and we can't fully 100% remember why we droppe= d using > kvm_vcpu_map/kvm_map_gfn. We were using kvm_vcpu_map() but at the time th= e new guest > mapping series was in discussion, so we dropped those until it settled in= . >=20 > One "side effect" on mapping shared_info with kvm_vcpu_map, is that we ha= ve to loop all > vcpus unless we move shared_info elsewhere IIRC. But switching vcpu_info,= vcpu_time_info > (and steal clock) to kvm_vcpu_map is trivial.. at least based on our old = wip branches here. I'm not mapping/unmapping every time. I've just changed the page_to_virt() bit to use kvm_map_gfn() as a one-time setup for now, because I need it to work for GFNs without a backing page. I have that working for the shinfo in my tree so far; will do the other pages next. In the fullness of time I'd like to eliminate the duplication between kvm_setup_pvclock_page() and kvm_xen_update_vcpu_time(), which are doing precisely the same thing. I think that can wait until we fix up the MMU notifier thing as discussed though, so they can all just do direct dereferencing. But I'm inclined not to get hung up on that for now. There are much more fun things to be playing with. --=-Yz2uI+xnw528HCGFiMOS Content-Type: application/x-pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgEFADCABgkqhkiG9w0BBwEAAKCCECow ggUcMIIEBKADAgECAhEA4rtJSHkq7AnpxKUY8ZlYZjANBgkqhkiG9w0BAQsFADCBlzELMAkGA1UE BhMCR0IxGzAZBgNVBAgTEkdyZWF0ZXIgTWFuY2hlc3RlcjEQMA4GA1UEBxMHU2FsZm9yZDEaMBgG A1UEChMRQ09NT0RPIENBIExpbWl0ZWQxPTA7BgNVBAMTNENPTU9ETyBSU0EgQ2xpZW50IEF1dGhl bnRpY2F0aW9uIGFuZCBTZWN1cmUgRW1haWwgQ0EwHhcNMTkwMTAyMDAwMDAwWhcNMjIwMTAxMjM1 OTU5WjAkMSIwIAYJKoZIhvcNAQkBFhNkd213MkBpbmZyYWRlYWQub3JnMIIBIjANBgkqhkiG9w0B AQEFAAOCAQ8AMIIBCgKCAQEAsv3wObLTCbUA7GJqKj9vHGf+Fa+tpkO+ZRVve9EpNsMsfXhvFpb8 RgL8vD+L133wK6csYoDU7zKiAo92FMUWaY1Hy6HqvVr9oevfTV3xhB5rQO1RHJoAfkvhy+wpjo7Q cXuzkOpibq2YurVStHAiGqAOMGMXhcVGqPuGhcVcVzVUjsvEzAV9Po9K2rpZ52FE4rDkpDK1pBK+ uOAyOkgIg/cD8Kugav5tyapydeWMZRJQH1vMQ6OVT24CyAn2yXm2NgTQMS1mpzStP2ioPtTnszIQ 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