From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 5BBD1C46CA1 for ; Thu, 19 Oct 2023 09:18:36 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1qtPA6-0001q3-I8; Thu, 19 Oct 2023 05:17:50 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1qtPA3-0001fb-RQ for qemu-devel@nongnu.org; Thu, 19 Oct 2023 05:17:47 -0400 Received: from casper.infradead.org ([2001:8b0:10b:1236::1]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1qtP9u-0005RY-BZ for qemu-devel@nongnu.org; Thu, 19 Oct 2023 05:17:47 -0400 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.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=TQpghlc2hnVcAA9ko5eURrbZG4hZg/v52UnpJlBT4rs=; b=DnGP+rVuZ/Bp47NvzaY3txYnFh Ojg4XaBwk0vVm594Jzj+EqDT3xeujtmVQV/z1YRByQLcEx+fSlSAxxrYe3WUB7OnupSUXoQkIO7DZ f883jsNi/NPm3IiZ1eG3a49+slkDxuetVmieTSeCtjgma4WB3XXG0EpW1YoQrWtqco/RLEEaMePK4 LTxvZ+6g6uTado8GMl2az0EVR7m6PWj1dJyZhgqY17hTBu/UxhUsEM/eM+jxlyoWfT3LXiZECAs/z UvHJzhhx0vdAgAPuLKbG8facVjVVmzGhV6tVJ6pbdko+0zYAfgRH7xft+HcAB5Gn2RutN/fElt/y0 0vu/Ol3Q==; Received: from [2001:8b0:10b:5:583b:153f:ff9:f813] (helo=u3832b3a9db3152.ant.amazon.com) by casper.infradead.org with esmtpsa (Exim 4.94.2 #2 (Red Hat Linux)) id 1qtP9m-006CD5-AJ; Thu, 19 Oct 2023 09:17:30 +0000 Message-ID: Subject: Re: [QEMU][PATCH v1 1/7] xen: when unplugging emulated devices skip virtio devices From: David Woodhouse To: Vikram Garhwal , Stefano Stabellini Cc: qemu-devel@nongnu.org, Juergen Gross , Anthony Perard , Paul Durrant , "Michael S. Tsirkin" , Marcel Apfelbaum , Paolo Bonzini , Richard Henderson , Eduardo Habkost , "open list:X86 Xen CPUs" Date: Thu, 19 Oct 2023 10:17:29 +0100 In-Reply-To: References: <20231005181629.4046-1-vikram.garhwal@amd.com> <20231005181629.4046-2-vikram.garhwal@amd.com> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-FFbScYBMq+2SmPMvLxxI" User-Agent: Evolution 3.44.4-0ubuntu2 MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html Received-SPF: none client-ip=2001:8b0:10b:1236::1; envelope-from=BATV+06ae5fa416ae820d9d5a+7361+infradead.org+dwmw2@casper.srs.infradead.org; helo=casper.infradead.org X-Spam_score_int: -43 X-Spam_score: -4.4 X-Spam_bar: ---- X-Spam_report: (-4.4 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_MED=-2.3, SPF_HELO_NONE=0.001, SPF_NONE=0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org --=-FFbScYBMq+2SmPMvLxxI Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Tue, 2023-10-10 at 13:24 -0700, Vikram Garhwal wrote: > Hi Stefano, > On Mon, Oct 09, 2023 at 04:51:53PM -0700, Stefano Stabellini wrote: > > On Thu, 5 Oct 2023, Vikram Garhwal wrote: > > > From: Juergen Gross > > >=20 > > > Virtio devices should never be unplugged at boot time, as they are > > > similar to pci passthrough devices. > > >=20 > > > Signed-off-by: Juergen Gross > > > Signed-off-by: Vikram Garhwal > > > --- > > > =C2=A0hw/i386/xen/xen_platform.c | 8 +++++++- > > > =C2=A01 file changed, 7 insertions(+), 1 deletion(-) > > >=20 > > > diff --git a/hw/i386/xen/xen_platform.c b/hw/i386/xen/xen_platform.c > > > index 17457ff3de..3560eaf8c8 100644 > > > --- a/hw/i386/xen/xen_platform.c > > > +++ b/hw/i386/xen/xen_platform.c > > > @@ -28,6 +28,7 @@ > > > =C2=A0#include "hw/ide/pci.h" > > > =C2=A0#include "hw/pci/pci.h" > > > =C2=A0#include "migration/vmstate.h" > > > +#include "hw/virtio/virtio-bus.h" > > > =C2=A0#include "net/net.h" > > > =C2=A0#include "trace.h" > > > =C2=A0#include "sysemu/xen.h" > > > @@ -132,7 +133,8 @@ static void unplug_nic(PCIBus *b, PCIDevice *d, v= oid *o) > > > =C2=A0=C2=A0=C2=A0=C2=A0 /* We have to ignore passthrough devices */ > > > =C2=A0=C2=A0=C2=A0=C2=A0 if (pci_get_word(d->config + PCI_CLASS_DEVIC= E) =3D=3D > > > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0 PCI_CLASS_NETWORK_ETHERNET > > > -=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 &= & !pci_device_is_passthrough(d)) { > > > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 &= & !pci_device_is_passthrough(d) > > > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 &= & !qdev_get_child_bus(&d->qdev, TYPE_VIRTIO_BUS)) { > >=20 > > Please update the in-code comment above to say "ignore passthrough > > devices and virtio devices" > > Sounds good. Will update in the code comment in v2. Please could you also remove the note in docs/system/i386/xen.rst which mentions having to dissuade the guest kernel from unplugging VirtIO devices by adding 'xen_unplug_emul=3Dnever' to its command line? --=-FFbScYBMq+2SmPMvLxxI Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgEFADCABgkqhkiG9w0BBwEAAKCCEkQw ggYQMIID+KADAgECAhBNlCwQ1DvglAnFgS06KwZPMA0GCSqGSIb3DQEBDAUAMIGIMQswCQYDVQQG EwJVUzETMBEGA1UECBMKTmV3IEplcnNleTEUMBIGA1UEBxMLSmVyc2V5IENpdHkxHjAcBgNVBAoT FVRoZSBVU0VSVFJVU1QgTmV0d29yazEuMCwGA1UEAxMlVVNFUlRydXN0IFJTQSBDZXJ0aWZpY2F0 aW9uIEF1dGhvcml0eTAeFw0xODExMDIwMDAwMDBaFw0zMDEyMzEyMzU5NTlaMIGWMQswCQYDVQQG EwJHQjEbMBkGA1UECBMSR3JlYXRlciBNYW5jaGVzdGVyMRAwDgYDVQQHEwdTYWxmb3JkMRgwFgYD VQQKEw9TZWN0aWdvIExpbWl0ZWQxPjA8BgNVBAMTNVNlY3RpZ28gUlNBIENsaWVudCBBdXRoZW50 aWNhdGlvbiBhbmQgU2VjdXJlIEVtYWlsIENBMIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKC 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