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 5550AC25B6C for ; Tue, 24 Oct 2023 15:23:05 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1qvJF6-0003hP-Mp; Tue, 24 Oct 2023 11:22:53 -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 1qvJEz-0003ej-3t for qemu-devel@nongnu.org; Tue, 24 Oct 2023 11:22:47 -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 1qvJEn-0003GH-MX for qemu-devel@nongnu.org; Tue, 24 Oct 2023 11:22:44 -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=JlWO6RgVPGd8M61ZGob0FmKUMzP8OvgxEpu1tN6QSyY=; b=hP/8A+nbVK64Ypy4/i0/KnUdkd AeYPMQxRl/oWxCcSujRqYqqqeNjqoi7Ib3lFXLFK+8bOv9lFyGap4cLMJ9voAlaNtSFJWmMcXs/db jztBXH7gc0IjbbPbb3Rv7rERq3EfbezJ1yJWPnzLfLq6oYdyVzRsaH0lgzbJVBdYGwFILEziB3nzZ /oRNOx41L7s2+jAZKC7yO2kbe8INnpbhW8dDmh3u/qTe+x0kvDjn3A5iLAZtDjgvpcg3DIYxMIv2F yGI92KLJo8UTi1McQ2mfQ8dyeiedr0oRlJgjIyHgDM/zzuIbVmq2hUQauEDavLBAV4cl+IfPWYFzN B/P4CWtA==; Received: from [2001:8b0:10b:5:758e:a1c4:bc7:e7a7] (helo=u3832b3a9db3152.ant.amazon.com) by casper.infradead.org with esmtpsa (Exim 4.94.2 #2 (Red Hat Linux)) id 1qvJEl-003ERB-MI; Tue, 24 Oct 2023 15:22:31 +0000 Message-ID: <7231ce3df7a3872b87e092bd3ed79bc5aa0f1484.camel@infradead.org> Subject: Re: [PATCH 1/4] hw/xen: only remove peers of PCI NICs on unplug From: David Woodhouse To: paul@xen.org, qemu-devel@nongnu.org Cc: "Michael S. Tsirkin" , Marcel Apfelbaum , Paolo Bonzini , Richard Henderson , Eduardo Habkost , Stefano Stabellini , Anthony Perard , Jason Wang , xen-devel@lists.xenproject.org Date: Tue, 24 Oct 2023 16:22:31 +0100 In-Reply-To: <1408fb32-3d91-4eb2-b0e7-4eba0f449906@xen.org> References: <20231017182545.97973-1-dwmw2@infradead.org> <20231017182545.97973-2-dwmw2@infradead.org> <1408fb32-3d91-4eb2-b0e7-4eba0f449906@xen.org> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-8AqSwZNUIqYzq2jVXXzA" 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+e2898748ca55db067849+7366+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 --=-8AqSwZNUIqYzq2jVXXzA Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Tue, 2023-10-24 at 15:32 +0100, Paul Durrant wrote: > On 17/10/2023 19:25, David Woodhouse wrote: > > From: David Woodhouse > >=20 > > When the Xen guest asks to unplug *emulated* NICs, it's kind of unhelpf= ul > > also to unplug the peer of the *Xen* PV NIC. > >=20 > > Signed-off-by: David Woodhouse > > --- > > =C2=A0=C2=A0 hw/i386/xen/xen_platform.c | 9 +++++++-- > > =C2=A0=C2=A0 1 file changed, 7 insertions(+), 2 deletions(-) > >=20 > > diff --git a/hw/i386/xen/xen_platform.c b/hw/i386/xen/xen_platform.c > > index 17457ff3de..e2dd1b536a 100644 > > --- a/hw/i386/xen/xen_platform.c > > +++ b/hw/i386/xen/xen_platform.c > > @@ -140,9 +140,14 @@ static void unplug_nic(PCIBus *b, PCIDevice *d, vo= id *o) > > =C2=A0=C2=A0 /* Remove the peer of the NIC device. Normally, this would= be a tap device. */ > > =C2=A0=C2=A0 static void del_nic_peer(NICState *nic, void *opaque) > > =C2=A0=C2=A0 { > > -=C2=A0=C2=A0=C2=A0 NetClientState *nc; > > +=C2=A0=C2=A0=C2=A0 NetClientState *nc =3D qemu_get_queue(nic); > > +=C2=A0=C2=A0=C2=A0 ObjectClass *klass =3D module_object_class_by_name(= nc->model); > > + > > +=C2=A0=C2=A0=C2=A0 /* Only delete peers of PCI NICs that we're about t= o delete */ > > +=C2=A0=C2=A0=C2=A0 if (!klass || !object_class_dynamic_cast(klass, TYP= E_PCI_DEVICE)) { >=20 > Would it not be better to test for object_class_dynamic_cast(klass,=20 > TYPE_XEN_DEVICE)? Only if we also change the actual unplug to destroy non-PCI devices too. The only non-PCI device you could have here is an ISA NE2000, I think. --=-8AqSwZNUIqYzq2jVXXzA 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 AQEAyjztlApB/975Rrno1jvm2pK/KxBOqhq8gr2+JhwpKirSzZxQgT9tlC7zl6hn1fXjSo5MqXUf 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